TST: Mackie Thump 12BST

 After we recently tested the big brother, we now have the little sister in the form of the Mackie Thump 12BST, which scores significantly in terms of transportability with its more compact dimensions and moderate weight. While Mackie was recently able to establish a new design with expanded functions with its Thump A series, the manufacturer has also gone a step further in terms of functionality with the smaller version. Let's take a look at the key data and make a direct sound comparison.

The basic data of the Mackie Thump 12BST

Why change a basic system that already meets almost all the requirements of a “working horse” in countless variations? The developers at Mackie must have had similar thoughts, which led to a new edition of the 12/1 loudspeaker combination. A 12-inch speaker handles the bass range, while a 1.4-inch tweeter with a titanium compression driver dome covers the high frequency range.

The crossover frequency is 2 kHz, the frequency response is given as 50 Hz - 23 kHz. As a sticker on the front tells us, both systems deliver 1300 watts peak, with 1000 watts being delivered to the woofer via a Class D power amplifier and 300 watts to the tweeter via a Class A/B power amplifier. As always, in the live range you can safely ignore all information above 16 kHz, downwards the 50 Hz is also reproduced as usual with a corresponding reduction from around 100 Hz and it is also likely that the power information is peak values be clear to everyone.

The weight of the Mackie Thump 12BST is comparatively moderate at 13.3 kg and is almost 20% less than its big brother. The dimensions: 615 mm x 358 mm x 356 mm also enable easy transport in the trunk of a car. The flexible orientation in terms of operating modes has been adopted, so the speakers can be operated in standard operation, in high stand mode via the internally installed commercially available 35 mm flange or, due to the trapezoidal shape, also as a floor monitor. As a complement to the A series, the BST series has 4 flight points for stationary operation, a facility that will prove to be a very useful function, especially due to the DSP extensions that will be mentioned in the test report.

Even if many users don't think it makes sense at first glance, the built-in multi-voltage power supply, which can process all voltages from 120 - 240 V via a power plug, offers a number of advantages. In addition to the flexibility when it comes to international use, these power supplies also have the advantage that they compensate for voltage fluctuations in the network, which are often encountered in rural areas of southern Europe or in mobile voltage generators. I recently had a floorboard disabled again while the show was running because the voltage generator couldn't hold 230 V.

A protective cover or rolling bag can also be purchased for the Mackie Thump 12BST as an optional accessory. There are 2 combination sockets (XLR / TRS) on the back for the input area, as well as a mix out for daisy chain operation.



What's new with the Mackie Thump 12BST?

The decisive further development of the Thump series is visible on the back of the case. In addition to the physical inputs/outputs, a push rotary controller attracts attention, which leads through a menu that is shown on the display next to it. After activating the box, a menu consisting of six submenus is displayed after the “Running Man” logo is displayed.

In the “Mixer” area you can now make a pre-selection for which area of application you would like to use the Mackie Thump 12BST, such as Music, Live, Speech, Monitor, Music + Subwoofer and Live + Subwoofer. Depending on the preselected preset, the tone control is adjusted accordingly, with mainly the bass range being cut or boosted. In addition, each input has a three-band tone control with corresponding center frequencies and individual volume control.

The Bluetooth range is Mackie Thump 12BST

As a crucial expansion of the system, a Bluetooth module was installed in the Mackie Thump 12BST as well as in the 15BST variant, which enables signals to be streamed via mobile devices such as iPhone / iPad or laptops. In order to be able to optimally use this quality in conjunction with the physical inputs, the Bluetooth signal is evaluated as a separate channel and can also be used with the above-mentioned. Parameters can be edited. Several speakers can be linked in mono or stereo via DSP, and according to the manufacturer, a range of up to 100 meters (in open terrain) should be possible.

However, in order to be able to use this extension to its full extent, you should definitely download the appropriate Thump Connect app for iOS and have constant internet access. The app in question not only enables the control of all functions that are available within the menu navigation of the box, but it also enables a range of functions that go beyond the manual access area on the box housing.

For example, it is possible to access videos, additional operating instructions or even further documents for the Mackie Thump 12BST. However, what far outshines the normal scope of comparable systems is the total recall function for recurring occasions. Three different snapshots with all the necessary parameters can be stored within the app. Depending on which constellation is required, you can quickly distinguish between a language event, a DJ event or a music performance. As expected, this range of functions has great advantages, especially in a permanent installation where you have to adapt the sound system accordingly depending on the venue booking.

You can also set up a zone sound system in which the different boxes are defined as “Primary” and “Secondary”. The transmission of the Bluetooth signal remains the same for both units, but both boxes can be controlled independently of each other. This is how you can, for example Reduce the volume significantly in an area away from the stage if the audience might want to have a conversation there and adjust the sound control accordingly.






The Mackie Thump 12BST in practice

Although the housing dimensions and speaker configuration are identical, the DSP processor of the Mackie Thump 12BST seems to change the sound marginally in direct comparison to the A version. Frequency response and spatial gradation seem identical, but the BST version seems a little more compressed, although this should not be taken as a judgmental thing. You should only clarify in advance whether there are any differences in sound in a setup that may contain both components.

In general, the sound of the Mackie Thump 12BST is the same as in the A version, meaning a powerful, bass-emphasized basic sound with a comparatively subtle midrange dip in the crossover spot and a slightly harsh treble reproduction. A particularly fine resolution from around 8 kHz is not necessarily the strength of the Mackie Thump 12BST, but the product shines with great flexibility in terms of possible uses.

As expected, the Mackie Thump 12BST finds its main area of application in the vocal range, singing as well as speech, or in the transmission of instruments beyond the real deep bass ranges. The design cannot be viewed as a full-range solution, but that was never the intended application of the system. For this area you cannot avoid purchasing one or more subwoofers.

Once again, the Bluetooth area is the outstanding feature for an active speaker in this price range. This time, too, the pairing was carried out without any problems with any Bluetooth device available to me in the form of the iPhone 6 and the iPad Air. Activate the Bluetooth function using the push encoder, the box appears in the device's Bluetooth window, select it, and you're done.

To connect a second box, you can now choose between the various options in the menu, although stereo streaming will be preferred by most people. Here too, no problems with the connection. After activating the “Auto Connect” and “Auto Link” functions, the previously selected connection is automatically activated after the components are switched on. Additional functions can be activated via the iOS app, such as a right/left switch, separating the speakers via Unlink and switching between zone and stereo management. Everything makes sense and is practical for the intended area of application.

In order to check the stability of the Bluetooth signal, it is recommended to test several devices in advance. Depending on the version and operating system, the range of the signal may vary. With my iPhone 6 I was once again able to generate a working connection of up to 30 meters in open terrain, which is a very decent value. However, the user still has to take stability into account even in the event of disruptive factors such as an audience, partition walls or additional devices.


Conclusion

With the Mackie Thump 12BST, the American manufacturer offers a decisive advantage in live operation with its Bluetooth connection. The possibility of signal processing in combination with the well-designed iOS app increases the flexibility of the product many times over and opens up new possibilities for individual sound reinforcement, especially in a permanent installation.

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Additional Informations:

Mackie Audio, also known as Mackie, is a brand of professional audio equipment founded in 1988 by Greg Mackie. The company was established in Woodinville, Washington, a suburb of Seattle. The location played a significant role in the company's identity and development.

### Founding Location: Woodinville, Washington

#### Historical Context
Woodinville is situated in the Pacific Northwest, an area known for its rich musical heritage and vibrant tech industry. During the late 1980s and early 1990s, the Seattle area became a hub for innovation, particularly in music and technology. The local culture was influenced by the burgeoning grunge movement, with bands like Nirvana, Pearl Jam, and Soundgarden gaining international fame. This environment provided fertile ground for a company like Mackie, which aimed to deliver high-quality audio equipment to both professional and amateur musicians.

### Key Features and Significance of Woodinville

1. **Proximity to Seattle:**
   - Woodinville’s close proximity to Seattle allowed Mackie to tap into the city’s dynamic music scene. The company could easily collaborate with local artists and sound engineers, ensuring their products met the needs of musicians and audio professionals.
   - Being near a major metropolitan area also facilitated access to a skilled workforce, including engineers, designers, and marketing professionals.

2. **Tech Industry Influence:**
   - The Seattle area is also known for its tech industry, with major companies like Microsoft and Amazon headquartered there. This tech-driven environment influenced Mackie’s approach to product development, emphasizing innovation and quality.

3. **Community and Networking:**
   - Woodinville’s location in the greater Seattle area allowed Mackie to build strong relationships within the music and audio production community. Networking with local studios, venues, and artists provided invaluable feedback and opportunities for product testing and improvement.

4. **Quality of Life:**
   - The quality of life in Woodinville, with its scenic beauty and outdoor recreational opportunities, made it an attractive place to live and work. This helped Mackie attract and retain top talent, contributing to the company’s long-term success.

### Evolution and Expansion

As Mackie grew, the company expanded its operations but remained rooted in the Seattle area. The choice to stay close to its founding location reflects the company’s commitment to its origins and the advantages the area provides.

- **Production Facilities:**
  Mackie initially manufactured its products locally, ensuring stringent quality control and fostering a culture of innovation. Over time, as demand increased, production expanded, but the company continued to maintain high standards.

- **Global Reach:**
  While Mackie began as a local company, it quickly gained international recognition. The strategic location in the Pacific Northwest facilitated both domestic and international shipping, helping Mackie grow its global presence.

### Conclusion

Mackie Audio’s founding in Woodinville, Washington, is more than just a historical fact; it is a key element of the company’s identity. The location offered numerous benefits, from proximity to a vibrant music scene and tech industry to an attractive quality of life that helped the company attract top talent. These factors contributed significantly to Mackie’s success and its reputation for producing high-quality, innovative audio equipment. Today, Mackie continues to be a prominent name in the audio industry, with its roots in the Pacific Northwest serving as a testament to the importance of location in the company’s growth and development.

TEST: Keeley MK3 Driver

 The Keeley MK3 Driver Pedal is a signature pedal for guitarist Andy Timmons, which can perform both overdrive and distortion functions.

Who is Andy Timmons?

Most readers will know Andy Timmons as an endorser of the Ibanez company. His signature model, which has been in the Asian manufacturer's portfolio for many years, is an integral part of the Ibanez catalog and it feels like there is no music trade fair in the world where Timmons does not appear as a demonstrator.

Most music listeners outside of the Musicians-Musician scene will probably remember Andy Timmons as the blonde sonny boy of the hard rock band Danger Danger, on whose first two albums 35 years ago he made a real impression with his virtuoso guitar playing.

The construction of the Keeley MK3 Driver

Robert Keeley was able to experience with the Keeley MK3 Driver Pedal how international trademark protection law can put the brakes on you in an unpleasant way and thus bring entire marketing and production processes to a standstill. Originally released under the name Muse Driver, the pedal came into conflict with another brand, resulting in Keeley being forced to change the name of the pedal due to a warning. This is all the more annoying because, according to Robert Keeley's own statements, the Muse Driver Pedal was one of the biggest revenue generators within his portfolio.

Be that as it may, the identical MK3 Driver sits in the same housing in which the other copies of the Driver series are installed and is identical to the Muse Driver apart from the name. The housing is once again of very high quality, the sheet steel used is very durable, and the dimensions (L x W x H): 127 mm x 67 mm x 70 mm are appropriate.

The controls have the classic division into Tone, Drive and Level, although the controls are once again pleasantly difficult to operate. This means that accidentally turning the controls is almost impossible. There are also two mini switches on the housing, one below the tone control and one below the drive control. These take on the function of a high pass, the switch of which is located below the tone control and the switch between silicon or germanium transistors, which is located on the right side.

The pedal can be switched between a buffered and a true bypass circuit using a flexible foot switch. This is extremely useful, because in the true bypass area the sound of the distortion, which is usually at the front of the signal chain, does not affect other pedals, and in the buffered area you compensate for the impedance of the cable lengths, which are partly in one A demanding set, especially with passive pickups, can result in a loss of sound.

On the front side, in addition to the input and output jack sockets, there is also the input for the power supply. Although the Keeley MK3 Driver only has a power consumption of 27 mA, battery operation is not provided for the overdrive pedal. Interestingly, you can use a power supply with a voltage between 9 and 18 volts as the internal voltage. On the one hand, this increases flexibility, but above all it can be used if you want to change something about the sound of the Keeley MK3 Driver. As a rule of thumb, the higher the voltage applied, the tighter the sound emitted.

The pedal, made in the USA, is delivered in a sturdy cardboard box, equipped with a fabric bag, simple operating instructions, stick-on rubber feet and a Keeley plectrum.

The sound of the Keeley MK3 Driver

Although the Keeley MK3 Driver is a signature pedal from Andy Timmons, the pedal can definitely be described as a real all-rounder. The drive level can be turned up from a comparatively subtle overdrive to real distortion and the usual controls such as tone and level intervene in the overall sound as far as they can.

The high-pass filter is a very good tool when it comes to getting the low-frequency pumping that occurs on the amplifier, depending on the tuning and instrument, under control. Especially when it comes to placing an instrument on a PA or the low-frequency range in the transition phase in studio recordings to keep the bass in check, a high-pass filter is always a good thing.

In my opinion, personal taste decides when it comes to silicon and germanium, the two transistor choices. A silicon transistor is a little softer in approach and more pleasing, but the germanium transistor performs better, but occasionally bites a little more. The sound here depends in particular on the instruments or pickups, so it is not possible to make a general statement as to which setting is best suited here.

The sound files were created with a Hagström Super Swede via a Sound City Master One Hundred, a 412 Marshall cabinet with Celestion G12 T 75 speakers and 2 pcs. Recorded with Shure SM 57 microphones.

Conclusion:

With the Keeley MK3 Driver, the American manufacturer has a good all-rounder in the area of overdrive and distortion pedals in its portfolio. The pedal impresses with a good basic sound, which can be used in both fusion and rock.

If you are looking for a flexible and neutral overdrive / distortion pedal, you should give the MK3 Driver a try.

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Additional Informations:

Title: The Fascinating Origin Story of Keeley Pedals

Introduction:
Keeley Electronics is a renowned manufacturer of guitar effects pedals, known for their exceptional quality and innovative designs. This article delves deep into the captivating history of Keeley Pedals, tracing their humble beginnings, evolution, and the impact they've had on the music industry. Join us on this journey to uncover the story behind the creation of these iconic pedals.

Early Beginnings:
The story of Keeley Pedals starts with its founder, Robert Keeley, a passionate guitarist and electronics enthusiast. In the late 1990s, Keeley began modifying pedals for his own use, seeking to enhance their sound and functionality. Word quickly spread about the remarkable improvements he made, and soon, fellow guitarists were knocking on his door, eager to have their pedals "Keeley-fied."

As demand grew, Robert Keeley decided to turn his passion into a business. In 2001, he officially launched Keeley Electronics, setting up shop in Oklahoma City. With a small team of dedicated individuals, Keeley began producing his modified pedals, offering guitarists a new level of tone and performance.

Innovation and Expansion:
Keeley Electronics quickly gained a reputation for pushing the boundaries of pedal design. Robert Keeley constantly sought to innovate and create pedals that would inspire musicians worldwide. With a keen ear for tone and a deep understanding of electronics, he introduced several groundbreaking designs that became instant classics.

One of Keeley's earliest successes was the Keeley Compressor, a pedal that revolutionized compression in the guitar world. Its transparent and studio-quality compression became highly sought after, earning Keeley Electronics a loyal following among guitarists of all genres.

Building on this success, Keeley continued to introduce new and exciting pedals. The Keeley Modded Boss DS-1, the Keeley Katana Boost, and the Keeley Super Phat Mod are just a few examples of the innovative and popular offerings from the company. Each pedal was meticulously designed to deliver exceptional tone, versatility, and reliability.

Collaborations and Artist Endorsements:
Keeley Electronics' commitment to excellence and innovation led to collaborations with renowned musicians and artists. Robert Keeley worked closely with guitarists like John Mayer, David Gilmour, and Andy Summers to develop signature pedals that captured their unique playing styles.

These collaborations not only showcased the versatility and adaptability of Keeley Pedals but also solidified their reputation as a go-to choice for professional musicians. The endorsement and support of these esteemed artists further propelled Keeley Electronics into the spotlight, making their pedals highly coveted among guitarists worldwide.

Continued Success and Legacy:
Over the years, Keeley Electronics has continued to expand its product line, introducing new pedals that cater to the evolving needs of guitarists. The company's commitment to quality, innovation, and customer satisfaction has remained unwavering, ensuring that each pedal that bears the Keeley name is a testament to their legacy.

Today, Keeley Pedals are recognized as a benchmark for excellence in the industry. Guitarists of all levels, from amateurs to professionals, rely on Keeley's pedals to shape their tone and enhance their musical expression. The company's dedication to producing top-notch effects pedals has cemented its place in the history of guitar gear.

#### Keeley Pedals: A Legacy of Tone and Innovation

In this final section, let's delve deeper into some of the iconic Keeley Pedals that have played a significant role in their journey and have become staples in the guitar world:

**1. Keeley Compressor:** The Keeley Compressor, introduced in the early 2000s, quickly became a game-changer in the realm of compression pedals. Robert Keeley's innovative design offered transparent, studio-quality compression, allowing guitarists to enhance sustain, even out dynamics, and add a touch of magic to their tone. The Keeley Compressor set a new standard for compression pedals and remains one of the most popular choices among guitarists.

**2. Keeley Overdrives:** Keeley Electronics offers a diverse range of overdrive pedals that cater to various tonal preferences. The Keeley-modded Boss Blues Driver and Boss DS-1 are highly regarded for their enhanced tone and responsiveness. The Keeley Katana Boost, known for its clean boost capabilities, has become a go-to pedal for many guitarists seeking to push their amps into saturated overdrive territory. These overdrive pedals offer a wide range of tonal options, from smooth and bluesy to crunchy and aggressive.

**3. Keeley Modded Pedals:** Keeley Electronics gained recognition for their modifications of existing pedals, taking popular models from other manufacturers and enhancing their performance. The Keeley-modded Ibanez Tube Screamer, for example, is highly sought after for its increased clarity, improved low-end response, and smoother saturation. These modifications have allowed guitarists to achieve their desired tones with greater precision and flexibility.

**4. Keeley Delay and Modulation Pedals:** Keeley Electronics expanded their pedal lineup with a range of delay and modulation effects that have garnered praise for their exceptional sound quality and versatility. The Keeley Caverns Delay/Reverb offers lush, atmospheric delay and reverb sounds in a compact pedal. The Keeley Dark Side combines multiple modulation effects, including phaser, flanger, rotary speaker, and U-Vibe, to create a comprehensive modulation solution for guitarists seeking to explore new sonic territories.

**5. Keeley Workstation Pedals:** In recent years, Keeley Electronics introduced the concept of workstation pedals, which combine multiple effects in one unit. The Keeley Eccos Delay/Looper and the Keeley Delay Workstation exemplify this approach, offering a wide range of delay and looping options in a single pedal. These workstation pedals have become go-to choices for guitarists who value versatility and convenience without compromising on sound quality.

Keeley Pedals' commitment to innovation, attention to detail, and dedication to meeting the needs of guitarists have contributed to their enduring legacy. Whether it's their signature compressors, overdrives, or modulation pedals, Keeley Electronics continues to set the bar high for quality and performance.

Conclusion:
The journey of Keeley Pedals from a small workshop in Oklahoma City to becoming a global leader in the guitar effects industry is a testament to the passion, innovation, and commitment of its founder, Robert Keeley. With their exceptional sound, reliability, and versatility, Keeley Pedals have left an indelible mark on the music world, shaping the tones of countless guitarists. As the company continues to innovate and push the boundaries of pedal design, the legacy of Keeley Pedals will undoubtedly endure for generations to come.

TEST: Keeley Blues Disorder

 The Keeley Blues Disorder pedal is a double pedal in which two well-known overdrive pedals have been merged into a single pedal using two circuits.

The construction of Keeley Blues Disorder

You might think that there is now pretty much every single pedal on the market that you can even remotely imagine. So what do you do if you're an established pedal designer and still want to take your products to a new level? You go and take two well-known pedals from the competition, construct two separate circuits and make them accessible on just one pedal via mini switches. This is what Robert Keeley and his team did with the Keeley Blues Disorder pedal, in which two very well-known pedals, the Marshall Blues Breaker and the OCD from Fulltone, are merged into a single pedal.

There are also two further plus points. On the one hand in the form of the fact that you only need half the space on your pedalboard to be able to access two classic blues-rock sounds and on the other hand you only have about half the costs that you would otherwise have to access for two pedals .

The structure of Keeley Blues Disorder

Several points ensure that a certain aha effect arises as soon as you get to grips with the pedal. The structure is quite classic, meaning it has three pleasantly stiff controls that regulate the level, tone and drive, all packed into a clear, classic housing that is very solid. The pedal is also manufactured in the USA and has an LED for the status display and a special feature in the foot switch area.

The footswitch is designed as both true bypass and buffered bypass, depending on whether the pedal is active or not. This combines the two features that, on the one hand, you do not want the sound of the pedal to have an influence on the other devices in bypass mode, but on the other hand, you also want to avoid the increased resistance that inevitably occurs due to the length of the cable when the pedal is in operation. balances.

The real special feature, however, takes place behind the two mini switches, which are each located below the tone and drive controls. On the left side you can set a more or less unprocessed frequency range by moving the mini switch up, which goes towards Marshall Blues Baker. If you switch the mini switch down, you increase the midrange in OCD style by approx. 20 dB, which causes a very strong boost in both volume and frequency range with an accompanying increase in distortion.

Using the right mini-switch you can switch up between soft clipping, again in Bluesbreaker style, or switch down with hard clipping in OCD style. Depending on how the other three controls are set, you have a very large choice of sound and you can basically say that you have more or less four pedals combined in one pedal.

The normal input and output are located on the front of the Keeley Blues Disorder in the form of jack sockets. In between is the mains connection, which is designed at 9 volts, but can also be increased to up to 18 V if necessary with a correspondingly changed sound response. Battery operation is not provided, although the pedal only has a current consumption of 29 mA.

The Sound of Keeley Blues Disorder

I have to get straight to the point, the pedal sounds excellent. Both in the rather soft Bluesbreaker orientation and in the rather hard OCD response, the pedal impresses with very good interaction between instrument and amplifier. The way it works together with the guitar's volume control is exemplary and the two basic sounds set are legendary anyway. In addition, the originals are achieved very well in terms of the tonal aspect.

Through clever experimentation, you can set up the two typical areas of application of these two overdrive and distortion pedals exactly as you would expect from a corresponding pedal. Both work particularly well in front of an amplifier that is set to completely clean or slightly crunchy, so that you can ultimately add a second channel to the amp or use the pedal to boost a basic sound for lead sounds or heavy use.

The pedal is convincing in all respects and if you want to give the pedal any negative point, it would be the fact that you unfortunately cannot switch between the two sounds using the foot switch, which would be the absolute highlight of the pedal. But who knows, maybe there will be an MK2 version of the pedal in a few months or years.

The sound files were created with a Hagström Super Swede via a Sound City Master One Hundred, a 412 Marshall cabinet with Celestion G12 T 75 speakers and 2 pcs. Recorded with Shure SM 57 microphones.

Conclusion

With the Keeley Blues Disorder, the American manufacturer has a very good 4 in 1 pedal in its portfolio. The adaptation of the two original products, Blues Breaker and OCD, works very well and ensures a wide range of good sounds.

Be sure to check it out.

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Additional Informations:

In the vast world of music, the search for the perfect sound has led musicians to an endless array of tools and gadgets. Among these, guitar pedals stand out as pivotal in shaping the tones that define genres and eras. Keeley Electronics, founded by Robert Keeley, has become a beacon for those in pursuit of exquisite audio quality. This article delves into the fascinating journey of Keeley Pedals, tracing its roots, milestones, and the innovations that cemented its place in the music industry.

#### Early Beginnings: Robert Keeley's Background
Robert Keeley's passion for electronics and music began early. Born in the late 1960s, Keeley grew up during a time when rock and roll was evolving rapidly. His fascination with music and technology led him to pursue studies in electrical engineering. His academic background provided him with the technical expertise necessary to understand and manipulate sound at a granular level. Keeley's early work involved repairing and modifying guitar amplifiers, which honed his skills and deepened his understanding of audio circuits.

#### The Birth of Keeley Electronics
Keeley Electronics was officially founded in 2001. The inception of the company was driven by Keeley's desire to create high-quality, reliable effects pedals that addressed the shortcomings he observed in the market. The early 2000s were a transformative period for the music industry, with digital technology starting to make significant inroads. Keeley, however, saw the enduring value in analog circuits and aimed to blend traditional craftsmanship with innovative designs.

The company's first product was the Keeley Compressor, which quickly garnered attention for its superior sound quality and build. Unlike many mass-produced pedals, Keeley's products were hand-assembled and rigorously tested, ensuring consistent performance and durability. The success of the Keeley Compressor laid the foundation for the company's reputation as a producer of premium guitar effects.

#### Key Innovations and Products
Keeley's approach to pedal design is characterized by meticulous attention to detail and a deep understanding of musicians' needs. Over the years, Keeley Electronics has introduced several groundbreaking products that have set new standards in the industry.

1. **Keeley Compressor (2001)**
   The Keeley Compressor is arguably the pedal that put Keeley Electronics on the map. It was celebrated for its ability to maintain the integrity of the guitar's tone while providing smooth, musical compression. The pedal's popularity was fueled by endorsements from high-profile guitarists and its frequent appearance in gear reviews.

2. **Keeley Katana Blues Driver (2002)**
   Following the success of the Compressor, Keeley introduced the Katana Blues Driver. This pedal became famous for its transparent overdrive, allowing guitarists to add grit and sustain without losing the character of their instrument's sound. The Katana was another hit, solidifying Keeley's reputation for producing pedals that enhance, rather than mask, the guitar's natural tone.

3. **Keeley MOD Plus Pedals (2003-2005)**
   Keeley also became known for his modification services. He offered "MOD Plus" versions of popular pedals from other manufacturers, such as the Boss DS-1 Distortion and the Ibanez Tube Screamer. These modified pedals featured upgraded components and circuitry improvements, which enhanced their performance and reliability. The success of these modifications demonstrated Keeley's deep understanding of audio circuits and his ability to innovate upon existing designs.

4. **Keeley Caverns Delay Reverb (2015)**
   In 2015, Keeley released the Caverns Delay Reverb, a pedal that combined two essential effects in one unit. The Caverns became popular for its lush, ambient soundscapes and its versatility, making it a favorite among guitarists looking to expand their sonic palette. The success of the Caverns highlighted Keeley's ability to create complex, multi-function pedals that maintained high audio quality.

#### Expansion and Evolution
As Keeley Electronics grew, the company expanded its product line to include a wide range of effects, from overdrives and distortions to modulations and delays. Keeley's commitment to quality remained unwavering, with each pedal undergoing rigorous testing and quality control.

In addition to expanding its product line, Keeley Electronics also invested in research and development. This investment led to the creation of new technologies and innovations that kept the company at the forefront of the industry. For example, Keeley's work on digital signal processing (DSP) allowed the company to create pedals that combined the warmth and character of analog circuits with the versatility and precision of digital technology.

#### Artist Collaborations and Endorsements
One of the factors that have contributed to Keeley's success is its strong relationships with artists. From the beginning, Keeley sought feedback from professional musicians to refine and improve his designs. These collaborations have resulted in pedals that are not only technically superior but also meet the practical needs of working musicians.

High-profile guitarists such as John Mayer, Brad Paisley, and David Gilmour have used Keeley pedals, providing valuable endorsements that have boosted the company's credibility and visibility. Keeley's willingness to listen to and collaborate with artists has ensured that his products remain relevant and desirable in a constantly evolving market.

#### Community and Culture
Keeley Electronics is not just a company; it's a community. Robert Keeley's commitment to customer service and his genuine passion for music have fostered a loyal following among guitarists. Keeley's presence at trade shows, guitar clinics, and online forums has helped to build a sense of community around the brand. This engagement has created a feedback loop, where customer input directly influences product development.

The company also places a strong emphasis on education. Keeley and his team regularly produce content that explains the technical aspects of their pedals, helping musicians to understand how to get the most out of their gear. This educational approach has further solidified Keeley's reputation as a trustworthy and knowledgeable source in the world of guitar effects.

#### Challenges and Resilience
Like any company, Keeley Electronics has faced its share of challenges. The rapidly changing music industry, economic fluctuations, and the pressures of maintaining high standards of quality have all tested the company's resilience. However, Keeley's commitment to innovation and quality has allowed the company to navigate these challenges successfully.

One significant challenge has been the competition from larger, mass-produced pedal manufacturers. Keeley Electronics has maintained its competitive edge by focusing on niche markets and offering products that cater to discerning musicians. By emphasizing quality over quantity, Keeley has been able to build a brand that stands out in a crowded marketplace.

#### Looking Ahead: The Future of Keeley Electronics
As Keeley Electronics moves forward, the company continues to innovate and expand its product line. The integration of digital technology with analog circuits remains a key focus, as Keeley seeks to create pedals that offer the best of both worlds. Additionally, the company is exploring new markets and opportunities, such as collaborating with other manufacturers and expanding its presence in international markets.

Robert Keeley's passion for music and electronics shows no signs of waning. As the company looks to the future, it remains committed to its core values of quality, innovation, and customer satisfaction. Keeley's journey from a small repair shop to a renowned pedal manufacturer is a testament to the power of dedication and a love for music.

#### Conclusion
The story of Keeley Pedals is one of passion, innovation, and a relentless pursuit of excellence. From its humble beginnings to its status as a leading name in the industry, Keeley Electronics has made a lasting impact on the world of music. Through a commitment to quality, an understanding of musicians' needs, and a willingness to embrace new technologies, Keeley has created products that stand the test of time. As the company continues to evolve, it remains a beacon for those in search of the perfect sound.

TEST: Mackie Thump 12A-15A

 Never change a running system, or to put it another way, never change a box office hit, at most modify it. Similar thought processes must have gone through the minds of Mackie's engineers when they brought the current successor to the successful series onto the market with the Mackie Thump 12A and 15A. So what should you change about a well-performing product to make it a little simpler, easier or perhaps just prettier for the user? Let's take a closer look at the two protagonists in more detail.

Construction and construction

OK, I admit, I had to smile at the first thought that popped into my head while unpacking the components. Battlestar Galactica? The Cylons attack? No, the statement is of course completely exaggerated, but the rounded shapes of its predecessors are now followed by hard edges in the current series, which reminds me of the silver puppet troupe from the seventies, especially from the rear view. In return, stackability increases significantly and, even with daisy chain operation, several housings can be better put together to form a compartment.

The concept of the full-range boxes has remained the same. Depending on the version, a 12 or 15 inch speaker takes care of the bass range, while a 1.4 inch tweeter with a titanium compression driver dome covers the high frequency range. We separated at 2 kHz. The frequency response is given as 50 Hz - 23 kHz (12A) and 32 Hz - 23 kHz (15A), although we all know from practice that all products of this type have long since abandoned linearity below 100 Hz, even a newborn The hearing power does not exceed 20 kHz. But consumers love numbers and it always reads so beautifully.

Which brings us to the next power point. According to the sticker on the front, both systems deliver 1300 watts peak, with 1000 watts being delivered to the woofer via a Class D power amplifier and 300 watts to the tweeter via a Class A/B power amplifier. Here you can safely smile a second time if you take the appropriate but not specified RMS or even sine values as a reference, but see the last paragraph.

Due to the stable but comparatively light plastic housing, the boxes with dimensions of 615 x 358 x 356 mm weigh only 15.4 kilograms (12A), or 686 x 442 x 356 mm and 18.3 kilograms ( 15A). The flexible orientation in terms of operating modes has also remained, so the speakers can be operated in standard operation, in high stand mode via the internally installed commercially available 35 mm flange or, due to the trapezoidal shape, also as a floor monitor. Despite the indicated holes, flight operations are not possible with the Mackie Thump 12A and 15A, but are reserved for the next higher variant, the Mackie Thump 12BST and 15BST.

Connections and concept

To my knowledge, the plug-and-play concept has rarely been implemented as consistently in a product from the sound reinforcement industry as with the Mackie Thump 12A and 15A. Starting with a manual, which includes printing of contact addresses and all legal obligations in 4 languages with only 12 pages of DIN A4, to the fact that the products do not have any sound control. Instead, the Mackie Thump 12A and 15A have four permanently configured modes called Music, Live, Monitor and Subwoofer. In the music area there is a slight scoop, the live area is comparatively linear, the monitor cuts the bass and high mids for the purpose of feedback loops and in the subwoofer Mackie puts a very steep high pass at around 120 Hz into the frequency response. The operating modes can be accessed one after the other using a pressure switch. In addition to the pressure switch, another switch allows you to deactivate the operating LED in order not to disturb presentations that place great value on appearance.

The Mackie Thump 12A and 15A have two combination sockets as connections, each of which has its own gain control. The designations Line, U (0 dB) and Mic were printed as a rough guide; there is no exact designation or an overload display in the preamplifier. Your ears have to do it. A common master volume control regulates the final volume, which has a clip LED. To the right of the combination sockets there is an XLR out for daisy chain operation, power switch, cold device plug with integrated universal power supply (100-240V AC), and that's it.

Practice

Let's start with the basic sound of the product. In contrast to its predecessor, Mackie emphasizes that they have built more power and a more pronounced bass reproduction into their Thump products. This is correct. The previous 200 watt sine wave is now available with around 400 watt sine wave (???), which actually allows for greater headroom, especially in the bass range. Up until just before the clipping area, the bass reproduction remains concise and crisp, allowing for a voluminous sound for this size of speaker.

The treble range is a little harder and sharper, which is also due to the area of use. The Thump series is not a studio monitor, whose resolution and depth graduation are as fine as possible are a must. Rather, it's about acoustically illuminating as many square meters as possible, which is a completely different premise. Mackie succeeds in this very well, even though everything outside of around 60 degrees in the treble range is actually no longer captured. Here you would most likely get 2 pieces each. Grab boxes on each side to get the problem under control.

As expected, the 15A version has a slightly higher bass content, while the slightly faster 12-inch bass speaker captures the center hole at around 2 kHz a little better than the heavier 15-inch speaker. There is no winner, it is advisable to check both variants and choose your personal favorite.

Mackie's selling point is that it can process all signals within the Thump family without any effort, be it a directly connected microphone, a line signal such as a keyboard, a string instrument such as a bass or an MP3 player. This can generally be answered with “yes” first, but followed by a big “but”. What every experienced sound person already knows may throw some beginners back a bit in their budget planning.

The Mackie Thump 12A and 15A basically “just make noise” and they do it well. However, when it comes to sound shaping, it is actually not possible to adequately amplify a microphone with an XLR input and a gain control as well as a volume control. The principle may still work to make a quick loud announcement or to acoustically hit customers with your goods in the style of a weekly market, but within a band context with singing, this minimalism reaches its limits.

The lack of even rudimentary filters cannot influence the sound of the signal in terms of microphone coloring or the vocal context, not to mention further dynamic signal processing such as compressors. It is therefore urgently advisable to include a suitable multi-channel mixer and suitable peripherals in your financial planning; this is the only way the speakers can show off their strengths. The “Live” preset, which is set almost linearly at the factory, in conjunction with the “U” position, speaks volumes.

If you ultimately only leave the volume to the Thump series and see the remaining presets as a good bonus for quick use, the speakers are really convincing, especially for this price.


Conclusion

With the Mackie Thump 12A and 15A series, America's best-known mixer manufacturer impresses in many ways. Conceptually designed for plug-and-play, almost all sound sources can be connected and amplified within seconds, with improved bass management and higher power output making its predecessor pale.

If you now take the time to optimize the signals present using external mixers and signal management, the Thump series can fulfill its actual function of “making loud” in the best possible way.

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Additional Informations:

## The History of 2-Way Loudspeakers in the PA Industry: A Comprehensive Overview

Two-way loudspeakers have become a staple in the professional audio (PA) industry, providing clear, high-quality sound for a wide range of applications, from live concerts and music festivals to conferences and corporate events. Their widespread adoption can be attributed to their ability to deliver a well-balanced soundscape that caters to both low and high frequencies, making them versatile and suitable for various acoustic environments.

The evolution of 2-way loudspeakers in the PA realm is an intriguing narrative that intertwines technological advancements with the ever-changing demands of sound reinforcement. To fully grasp the significance of these speakers, it's essential to delve into their history, understanding the factors that shaped their design and contributed to their dominance in the PA landscape.

### The Early Days: Laying the Foundation for Two-Way Sound

The concept of two-way loudspeaker systems can be traced back to the early 20th century, with the invention of the first electrical loudspeakers. These early designs were rudimentary, often consisting of a single cone driver responsible for reproducing the entire audio spectrum. However, as the demand for higher-fidelity sound grew, the limitations of these single-driver systems became apparent.

In the 1920s, advancements in loudspeaker technology led to the development of multi-driver systems, paving the way for the emergence of two-way loudspeakers. These early two-way systems typically employed a combination of a woofer (for low frequencies) and a tweeter (for high frequencies), each specialized to handle their respective portion of the audio spectrum.

### Pioneering Efforts and Technological Milestones

The 1930s and 1940s witnessed significant advancements in two-way loudspeaker technology, driven by the efforts of pioneering engineers and companies. Altec Lansing, JBL, and Electro-Voice were among the early innovators, introducing groundbreaking loudspeaker designs that pushed the boundaries of sound quality and performance.

A notable milestone in the history of two-way loudspeakers was the development of the coaxial loudspeaker in the 1940s. This innovative design placed the tweeter directly in the voice coil of the woofer, resulting in improved dispersion and phase coherence. Coaxial loudspeakers quickly gained popularity in PA applications, particularly for vocal reinforcement.

### The Rise of Two-Way Loudspeakers in the PA Industry

The post-World War II era saw a surge in the popularity of two-way loudspeakers in the PA industry. This was fueled by several factors, including:

* **Improved Sound Quality:** Two-way loudspeakers offered a significant improvement in sound quality compared to single-driver systems, providing a more balanced and detailed soundscape.

* **Versatility:** Two-way loudspeakers proved versatile, suitable for a wide range of PA applications, from small venues to large outdoor concerts.

* **Portability:** Advancements in loudspeaker design led to more compact and lightweight two-way systems, making them easier to transport and set up.

As a result of these factors, two-way loudspeakers became the go-to choice for sound reinforcement professionals, replacing single-driver systems in many applications.

### The Modern Era: Refinements and Innovations

The modern era of two-way loudspeakers has been characterized by continuous refinement and innovation. With the advent of new materials, manufacturing techniques, and computer-aided design tools, loudspeaker engineers have been able to push the performance boundaries of two-way systems.

Key advancements in modern two-way loudspeaker design include:

* **Improved Driver Technology:** Woofers and tweeters have undergone significant improvements in terms of efficiency, power handling, and frequency response.

* **Advanced Crossover Networks:** Crossover networks, which divide the audio signal between the woofer and tweeter, have become more sophisticated, ensuring seamless transitions between frequency ranges.

* **Speaker Enclosure Design:** Enclosure design has evolved, with a focus on optimizing airflow, reducing resonances, and improving overall sound dispersion.

### Conclusion: Two-Way Loudspeakers – A Cornerstone of PA Technology

Two-way loudspeakers have firmly established themselves as a cornerstone of PA technology, providing a versatile and high-quality sound solution for a diverse range of applications. Their ability to deliver clear, balanced sound across the frequency spectrum has made them indispensable for sound reinforcement professionals worldwide.

As technology continues to advance, two-way loudspeakers are poised to remain at the forefront of PA innovation, with further refinements and advancements in driver design, crossover technology, and enclosure materials. The future of two-way loudspeakers is undoubtedly bright, ensuring that they will continue to play a pivotal role in shaping the soundscapes of live performances, events, and installations for years to come.

TEST: Mackie TH-15A

 Maybe it's just a subjective perception on my part, but it's slowly starting to seem to me as if the days of passive loudspeaker designs in the small P.A. and vocal systems sector are numbered. It definitely makes sense if you take a closer look at the design-related peculiarities of the fused power amplifier/loudspeaker combination in one housing.

Not only is there no need to transport the external power amplifier in the 19-inch format, along with cabling, but the space required both in the transporter and on stage is also significantly reduced. Especially in the area of discreet sound reinforcement at private parties or company anniversaries, where every case more or less represents a visual faux pas, minimizing the tools on stage is a must!

In order to still be able to offer a voluminous sound with the appropriate air movement, fully-fledged multi-way constructions have recently appeared more and more often, sometimes with a 15-inch model in the bass range, but these also often have to deal with the problem of transport weight have to beat.

In order to overcome this problem, Mackie has consistently focused on the issue of weight in its TH-15A product and tried to ensure the fusion of performance with low weight using various components. That makes you curious.


construction

The Mackie TH-15A is an active two-way box. In terms of performance, the product generates 200 watts sine wave with a peak of 400 watts, with a 15 inch bass speaker being operated with a 150 watt Class D power amplifier, while the 1 inch tweeter driver is operated with a Class AB power amplifier. Separation occurs at 3 kHz. In order to support the bass a little more, the construction is designed as a bass reflex.

In addition to the comparatively small Class D power amplifier, the very light housing made of polypropylene ensures that the product only has a total weight of 16.3 cm despite the above-mentioned performance specifications and the housing dimensions of 68.9 cm x 42.7 cm x 40.1 cm kilogram!

The area of application ranges from the classic vocal system to the floor monitor area (trapezoidal shape!) to the full-fledged club P.A. with appropriate daisy chain operation of several individual components. The box can even be used as a moderate drum fill in a pinch, provided the drummer doesn't play in a Motörhead tribute band.


In terms of transport, the product has three handles or recessed grips, two on the outside and one on the top. Due to the convenient placement and the weight mentioned above, a man of average strength can easily transport this box alone without exposing himself to the risk of back pain.

The construction has four stacking troughs on the top and bottom, which should, however, be treated with a little caution. For a well-situated event, the tilting is sufficient to place two boxes safely on top of each other. However, if you are dealing with a throbbing mosh pit in front of the stage, with one or the other tumbling against a sound system, the individual elements must be secured with tension straps. The box also has the standard 35 mm flange on the bottom for stand operation.

A special feature, especially in this price range, is the three-band tone control, which is recessed on the back of the box. Two shelving filters at 80 Hz and 12 kHz, as well as a semi-parametric mid-band with a selectable frequency between 100 Hz and 8 kHz, ensure post-processing of the applied signal. If necessary, the equalizer can also be deactivated using a pressure switch.


Regarding the connection panel, the user has to make do with a single XLR socket, which he can loop through via another XLR socket if necessary. That's it, there's nothing more, but let's be honest, Speakon is eliminated and jack or even Cinch in the performance class? Go away....

Finally, the master volume controller, a power plug and the on/off switch are all located slightly inwards on the back of the housing. Oh, by the way, you can also easily connect a microphone directly. Despite the lack of a gain control, the result is quite usable. Barkers of all countries, unite ;-)



Practice

As soon as you activate the construction, several typical Mackie components catch your eye and ear. In addition to the characteristic blue LED on the front panel, it is the rather soft treble that runs through the entire Mackie speaker range, especially since the treble control is very tasteful.

In general, the sound control is pleasing. Even if the filters in this price range do not quite reach the culture of the more expensive Mackie consoles, the possibility of frequency correction can almost be viewed as a luxury in this segment. With the necessary sensitivity, spatial problem areas can be addressed and possibly sound-unfavorable source material can be processed. So everything is fine?

Well, where there is a lot of light, there is sometimes a bit of shadow. The weight advantages mentioned at the beginning are undoubtedly a relief for your back and your wallet, but they also have the disadvantage that, due to the reduced mass, low-frequency components easily cause the housing to vibrate. Depending on the sound material, you could notice that, especially with strong bass-heavy material and boosting of the same, the housing tends to make a slight drone and the quality of the radiation characteristics of the construction is somewhat reduced.

The fact that a 15-inch model can of course process more low-frequency components than the more commonly used 12-inch model also contributes to this. So, especially to the gentlemen DJ, be careful with the bass control, even if the loudspeaker seduces you.

As expected, there is a slight dip in the high-mid range, as the bass loudspeaker cannot manage the range between 2 - 3 kHz quite as well due to its sluggish mass until the high-frequency horn finally kicks in. I see real problems in this regard. but not because the Hochtorn horn in this design is very expansive and compensates for this small flaw well.

A small annoyance, as with many speakers of the same design, is the cable routing when using the product as a floor monitor. No matter which side the box is on, either the IEC plug or the XLR cable will be bent at an angle, which in the medium term can lead to a cable break or damage to the socket. Therefore, slightly rework the connector arrangement or housing shape and everything is in order. Oh yes, the controls are a bit wobbly because they are not countered on the outer plate. Not existential, but it would have been nice.


Conclusion

It happened as it had to, the active Mackie TH-15A construction is also a really valuable purchase in terms of price-performance ratio. For less than 300 euros you get a highly flexible sound system construction that covers a wide range of areas.

An additional tone control, good workmanship and a very low weight make the TH-15A an all-purpose weapon when it comes to being quick, light, uncomplicated and inexpensive.

Recommended!

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Additional Informations:

Multi-way loudspeaker systems featuring a 1-inch compression driver and a 15-inch woofer have become a cornerstone in the professional audio (PA) industry. These systems are designed to deliver high-fidelity sound across a wide frequency range, combining the strengths of both high-frequency precision and robust low-frequency performance. This article explores the history, technological advancements, and impact of these versatile loudspeaker systems in the PA domain.

### Early Loudspeaker Technology

The origins of loudspeaker technology date back to the early 20th century. Initial designs were rudimentary and typically featured a single driver attempting to cover the entire audio spectrum. These early systems, often horn-loaded to improve efficiency, were limited in frequency response and sound fidelity. The single driver struggled to reproduce both low and high frequencies accurately, resulting in significant audio distortion and subpar performance.

### Emergence of Multi-Way Systems

The need for improved sound quality led to the development of multi-way loudspeaker systems. By using multiple drivers, each optimized for a specific portion of the audio spectrum, engineers could enhance sound clarity and minimize distortion. This concept laid the foundation for the multi-way systems that would later feature the combination of a 1-inch compression driver and a 15-inch woofer.

### Introduction of the 1-Inch Compression Driver

Compression drivers are specialized high-frequency drivers designed to produce clear and powerful high-end sound. The 1-inch compression driver, in particular, became popular due to its ability to deliver precise and articulate high frequencies. These drivers use a small diaphragm attached to a voice coil, which is driven by a powerful magnet. The diaphragm's movement compresses the air in a small chamber, which is then directed through a horn to amplify the sound.

#### Early Compression Drivers

The first compression drivers emerged in the 1930s and 1940s, primarily used in public address systems and cinema sound. These early models were relatively crude but laid the groundwork for more advanced designs. The introduction of the 1-inch compression driver marked a significant improvement in high-frequency reproduction, offering better clarity and higher output levels compared to previous technologies.

### Development of the 15-Inch Woofer

Simultaneously, advancements were being made in low-frequency driver technology. The 15-inch woofer became a popular choice for handling bass frequencies due to its ability to move a large volume of air. This driver size struck a balance between low-frequency extension and efficiency, making it ideal for PA applications.

#### Early 15-Inch Woofers

The first 15-inch woofers appeared in the 1950s and 1960s. These early woofers were typically used in large speaker cabinets and were designed to provide powerful bass response for live music and public address systems. Over time, improvements in materials and engineering led to more efficient and robust woofer designs.

### Birth of the 1/15 Multi-Way Loudspeaker System

Combining the strengths of the 1-inch compression driver and the 15-inch woofer, the 1/15 multi-way loudspeaker system emerged as a powerful solution for PA applications. These systems typically feature a two-way design, with the 15-inch woofer handling low and mid frequencies and the 1-inch compression driver covering the high frequencies.

#### Early 1/15 Systems

The first 1/15 multi-way systems appeared in the 1960s and 1970s. These systems used passive crossovers to divide the audio signal into separate frequency bands, directing each band to the appropriate driver. The passive crossover networks were relatively simple, consisting of capacitors, inductors, and resistors, but they marked a significant improvement in sound quality compared to single-driver designs.

### Advances in Crossover Technology

Crossover technology quickly became a focal point for innovation in multi-way loudspeaker systems. Early passive crossovers had fixed crossover points, limiting their flexibility and performance. As technology advanced, more sophisticated crossover designs were developed, allowing for adjustable crossover points and improved frequency band separation.

#### Active Crossovers

The introduction of active crossovers in the 1970s and 1980s revolutionized the design of 1/15 systems. Unlike passive crossovers, active crossovers are placed before the power amplification stage and use active electronic components like transistors and operational amplifiers. This placement allows for more precise control over the frequency division and offers the ability to adjust crossover points more accurately. Active crossovers also enable independent amplification for each driver, improving overall system efficiency and sound quality.

### Driver Technology and Materials

The evolution of driver technology and materials has been integral to the development of 1/15 multi-way loudspeaker systems. Early drivers used paper cones and metal diaphragms, which had limitations in terms of durability and sound fidelity. Over time, new materials such as polypropylene, Kevlar, and carbon fiber were introduced, offering improved performance characteristics.

#### Woofer Development

Woofers in 1/15 systems are designed to handle low and mid frequencies, typically ranging from 20 Hz to 1.5 kHz. Advances in woofer design have focused on improving cone materials, motor structures, and suspension systems to enhance low-frequency response and minimize distortion. Modern woofers often use materials like treated paper, aluminum, or composite materials to achieve the desired balance of strength and lightness.

#### Compression Driver Development

Compression drivers, particularly the 1-inch variety, are responsible for high frequencies, usually from 1.5 kHz to 20 kHz. The development of new diaphragm materials such as titanium and mylar, along with improvements in magnet structures and phase plug designs, has significantly enhanced the performance of these drivers. Modern 1-inch compression drivers offer higher output, greater clarity, and improved reliability compared to their predecessors.

### Integration with Digital Signal Processing (DSP)

The advent of digital signal processing (DSP) in the late 20th century brought about another wave of innovation in 1/15 multi-way loudspeaker systems. DSP allows for precise control over various aspects of the audio signal, including equalization, crossover settings, and time alignment. This technology enables engineers to optimize the performance of 1/15 systems in real-time, compensating for acoustic anomalies and ensuring consistent sound quality across different environments.

### Applications in Professional Audio

1/15 multi-way loudspeaker systems are ubiquitous in professional audio applications due to their balance of performance, cost, and complexity. They are commonly used in live sound reinforcement, installed sound systems, and studio monitoring.

#### Live Sound Reinforcement

In live sound applications, 1/15 systems offer the clarity and power needed to deliver high-quality audio to audiences of various sizes. They are often used in combination with subwoofers to extend the low-frequency response, creating a full-range sound system capable of handling a wide variety of music and speech content.

#### Installed Sound Systems

1/15 loudspeakers are also prevalent in installed sound systems, such as those found in theaters, stadiums, and houses of worship. Their ability to provide even coverage and high intelligibility makes them ideal for these environments, where both music and speech reproduction are critical.

#### Studio Monitoring

In the studio, 1/15 monitors are essential tools for recording and mixing engineers. They provide accurate sound reproduction, allowing engineers to make precise adjustments to their recordings. The combination of a 15-inch woofer and a 1-inch compression driver ensures that these monitors can handle a wide range of frequencies, providing a clear and detailed sound.

### Conclusion

The evolution of 1/15 multi-way loudspeaker systems has been marked by continuous innovation and improvement. From their early beginnings as a solution to the limitations of single-driver designs, these systems have evolved into highly sophisticated and versatile tools in the professional audio industry. Advances in crossover technology, driver materials, and digital signal processing have all contributed to the superior performance and widespread adoption of 1/15 systems. As technology continues to advance, the future of 1/15 loudspeaker systems promises even greater enhancements, further solidifying their role as indispensable components in the world of professional audio.

TEST: Mackie TH-12A

 If you have dealt with the topic of active 2-way sound reinforcement in recent years, you cannot avoid the name Mackie. Especially when it comes to lightweight construction combined with uncomplicated handling, the name comes up again and again. With the Thumb series, in addition to the successful TH-15A, Mackie now also relies on the smaller version TH-12A, which, as expected, comes with the more compact 12-inch version instead of a 15-inch woofer, without reducing the performance specifications.

The construction was designed by the same guild that produced the best-selling SRM450v2. The product was developed in the USA and the active box is built in China.


construction

The Mackie TH-12A is an active two-way speaker, which has a power output of 200 watts sine wave and a peak of 400 watts, with the 12 inch bass speaker having a 150 watt Class D, and the 1 inch tweeter driver a Class AB power amplifier is operated. As is usual in this performance class, the construction is designed as a bass reflex. The woofer is protected from external influences by a solid metal grille, and the driver is installed sufficiently back.

As with its big sister, the very light casing made of polypropylene ensures that the product only has a very moderate total weight of 11.6 kilograms despite generously proportioned performance specifications and casing dimensions of 596 x 367 x 314 mm. Despite the pure plastic design, the housing proves to be scratch-resistant and "deformable", which means that the plastic tray does not break easily under strong mechanical external influences.

Thanks to its trapezoidal shape, the design can be used from the classic vocal system to the floor monitor area to a simple small P.A. expand if you generate a corresponding daisy chain operation of several components and do not need the ultimate sub-bass in your performance. It gives the impression that speech and song transmission in the P.A. Area is the primary area of application of the box.


In order to be able to move the construction at the most ergonomic angle at any time, the product has three handles or recessed grips, two on the outside and one on the top. This means that the box can be maneuvered relatively easily onto a high stand without putting excessive strain on the back area. The construction only has four stacking troughs on the underside, which defines the area of application of the construction even more precisely. The Tower of Babel is not the thing here, but rather the department of additional subwoofers plus a spacer rod. To ensure this operating mode, the box has the standard 35 mm flange on the bottom for stand operation.

The integrated three-band tone control, which is recessed on the back of the box for protection reasons, is always a real plus. Two shelving filters at 80 Hz and 12 kHz, as well as a semi-parametric midband with a selectable frequency between 100 Hz and 8 kHz, ensure post-processing of the applied signal if necessary. If in doubt, the equalizer can also be deactivated using a pressure switch.


As with the TH-15A, the user has to make do with a single XLR socket, which he can loop through via another XLR socket if necessary. A cinch plug might be helpful for connecting an MP3 player or similar equipment; if necessary, you can of course also work with adapters.


Finally, the master volume control, a power plug and the on/off switch, as well as the tone control controls, are all located slightly inwards on the back of the housing. Due to the XLR input, you can also connect a microphone directly if necessary. Due to the lack of a gain control, there may be a slight mismatch, but the basic function will be retained.


Practice

If you apply a signal to the speaker, you will immediately hear the characteristic Mackie sound. The fairly soft highs and the open sound ensure a universal area of use. Once again, the treble control at 12 Khz is particularly pleasing, an area that tends to cause unpleasant scratching in the competition. Even if the sound culture does not reach the range of the VLZ series, the filter section is very appealing for this price segment.

With the necessary sensitivity, spatial problems can be put into perspective with the help of the parametric mid control or source material that is sonically unfavorable can be processed. Remember, to get sound problems under control, you can also lower frequencies! The midrange in particular sometimes prefers the minus dB range rather than the boost sector. At 80 Hz, the bass control is relatively low for a 12-inch speaker, but it works pleasantly discreetly so that, assuming moderate handling, you don't have to worry about a low output.

Due to the 12-inch device, a fact that should not be underestimated can be easily identified. While the large TH-15A version has a slight dip in the high-mid range, as the bass loudspeaker does not quite keep in touch with the tweeter horn in the range between 2 - 3 kHz due to its inert mass, the faster 12 inch version gets out of the starting blocks much faster and conveys a more homogeneous sound spectrum.

What is pleasantly noticeable about this design is the cable routing when using the product as a floor monitor. While the big sister still had problems with plugs bending, especially with the power cables, due to the shape, the TH-12A has thought better of it. For the first time, regular Neutrik plugs can be used without there being any mechanical stress on the quick-release axles, but only if the box with the tweeter horn is on the left side. What remains are the somewhat wobbly controls, which are not countered on the outer panel. Not really bad, but it would have been an additional security point.



Conclusion

With the active TH-12A construction, Mackie is expanding its position in the active 2-way sector and leaves a good overall impression. For just under €300 street price you get an easy-to-use, flexible sound system construction that serves a wide range of applications.

Small, light, well-engineered and with good workmanship, you can't go wrong with this product. Anyone thinking about purchasing in this segment should have the TH-12A on their list.

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Additional Informations:

Two-way loudspeaker systems are a cornerstone of professional audio (PA), celebrated for their ability to deliver a broad frequency range with clarity and efficiency. By dividing audio signals into two frequency bands, each handled by specialized drivers, two-way systems offer a balance between performance and complexity, making them a popular choice in various PA applications. This article delves into the rich history and development of two-way loudspeaker systems, tracing their technological advancements and impact on the audio industry.

### Early Loudspeaker Designs

The origins of loudspeaker technology date back to the early 20th century. Initial designs were rudimentary, often consisting of a single driver tasked with reproducing the entire audio spectrum. These early systems, frequently horn-loaded to boost efficiency, struggled with limitations in frequency response and sound fidelity. The single driver could not effectively cover both low and high frequencies, resulting in significant audio distortion and subpar performance.

### The Concept of Multi-Way Systems

The quest for improved sound quality led to the concept of multi-way loudspeaker systems. By using multiple drivers, each optimized for a specific portion of the audio spectrum, engineers could enhance sound clarity and minimize distortion. This concept laid the foundation for the development of two-way loudspeaker systems, which became the first step towards more sophisticated multi-way designs.

### Birth of the Two-Way System

The two-way loudspeaker system emerged as a solution to the limitations of single-driver designs. It typically consists of a woofer, responsible for low frequencies, and a tweeter, designed for high frequencies. The key innovation in two-way systems is the crossover network, which divides the audio signal into separate frequency bands, directing each band to the appropriate driver.

#### Early Two-Way Designs

The first two-way loudspeaker systems appeared in the 1930s and 1940s. These early models used passive crossovers, which are placed between the amplifier and the drivers. Passive crossovers rely on passive electronic components like capacitors, inductors, and resistors to split the audio signal. These components were relatively simple but marked a significant improvement over single-driver systems, offering better sound quality and higher output levels.

### Advancements in Crossover Technology

Crossover technology quickly became a focal point for innovation in two-way loudspeaker systems. Early passive crossovers had fixed crossover points, which sometimes limited their flexibility and performance. As technology advanced, more sophisticated crossover designs were developed, allowing for adjustable crossover points and improved frequency band separation.

#### Active Crossovers

The introduction of active crossovers in the 1960s and 1970s revolutionized the design of two-way systems. Unlike passive crossovers, active crossovers are placed before the power amplification stage and use active electronic components like transistors and operational amplifiers. This placement allows for more precise control over the frequency division and offers the ability to adjust crossover points more accurately. Active crossovers also enable independent amplification for each driver, improving overall system efficiency and sound quality.

### Driver Technology and Materials

The evolution of driver technology and materials has been integral to the development of two-way loudspeaker systems. Early drivers used paper cones, which, while lightweight and efficient, had limitations in terms of durability and sound fidelity. Over time, new materials such as polypropylene, Kevlar, and carbon fiber were introduced, offering improved performance characteristics.

#### Woofer Development

Woofers in two-way systems are designed to handle low frequencies, typically ranging from 20 Hz to 2 kHz. Advances in woofer design have focused on improving cone materials, motor structures, and suspension systems to enhance low-frequency response and minimize distortion. Modern woofers often use materials like treated paper, aluminum, or composite materials to achieve the desired balance of strength and lightness.

#### Tweeter Development

Tweeters are responsible for high frequencies, usually from 2 kHz to 20 kHz. The development of dome tweeters in the mid-20th century represented a significant leap forward. Dome tweeters, with their lightweight diaphragms and efficient motor structures, offer superior high-frequency response and dispersion compared to earlier cone tweeters. Materials such as silk, aluminum, and titanium are commonly used in modern tweeter designs to achieve the desired performance.

### Integration with Digital Signal Processing (DSP)

The advent of digital signal processing (DSP) in the late 20th century brought about another wave of innovation in two-way loudspeaker systems. DSP allows for precise control over various aspects of the audio signal, including equalization, crossover settings, and time alignment. This technology enables engineers to optimize the performance of two-way systems in real-time, compensating for acoustic anomalies and ensuring consistent sound quality across different environments.

### Applications in Professional Audio

Two-way loudspeaker systems are ubiquitous in professional audio applications due to their balance of performance, cost, and complexity. They are commonly used in live sound reinforcement, installed sound systems, and studio monitoring.

#### Live Sound Reinforcement

In live sound applications, two-way systems offer the clarity and power needed to deliver high-quality audio to audiences of various sizes. They are often used in combination with subwoofers to extend the low-frequency response, creating a full-range sound system capable of handling a wide variety of music and speech content.

#### Installed Sound Systems

Two-way loudspeakers are also prevalent in installed sound systems, such as those found in theaters, stadiums, and houses of worship. Their ability to provide even coverage and high intelligibility makes them ideal for these environments, where both music and speech reproduction are critical.

#### Studio Monitoring

In the studio, two-way monitors are essential tools for recording and mixing engineers. They provide accurate sound reproduction, allowing engineers to make precise adjustments to their recordings. The compact size and high performance of two-way monitors make them a popular choice in both professional and home studios.

### Conclusion

The evolution of two-way loudspeaker systems has been marked by continuous innovation and improvement. From their early beginnings as a solution to the limitations of single-driver designs, two-way systems have evolved into highly sophisticated and versatile tools in the professional audio industry. Advances in crossover technology, driver materials, and digital signal processing have all contributed to the superior performance and widespread adoption of two-way systems. As technology continues to advance, the future of two-way loudspeaker systems promises even greater enhancements, further solidifying their role as indispensable components in the world of professional audio.

TEST: Mackie SRM450V2

 In recent years there has been a trend in the sound reinforcement industry that relies on minimal housing dimensions with maximum power output. We're talking about powerful active speakers, which, due to their compact design, have recently been increasingly found at smaller club gigs, small open air sound systems and increasingly with cover bands of various styles. A typical representative of this genre is the SRM450v2 from the American manufacturer Mackie, a box which, due to its asymmetrical trapezoidal shape, can handle both PA sound reinforcement and be used as a floor wedge.

Construction:

The loudspeaker system is a relatively clear plastic construction with the dimensions: height 66 centimeters, width 39 centimeters, depth 38 centimeters, and weighs 18 kilograms. The coarse-grained plastic housing makes a highly solid impression and is flawlessly processed. Due to the carrying handles, which are both ergonomically positioned and ensure a good grip thanks to their core, the SRM450 can be easily moved to the appropriate high stand as well as to the wedge position.

In order to lock the box on the stand, there is an additional screw connection on the bottom/back of the construction. If the system is to be operated as a flying structure, a total of eight different rigging points are available to the user. Due to a recessed recess on the top of the housing, the box can be easily transported with one hand. For stacking purposes, there are 3 feet or troughs embedded on the top and bottom, which are further secured against involuntary movement using external bolts.

The SRM450v2 is an active biamping system, which consists of a titanium tweeter horn with a load capacity of 100 watts and a 15 inch woofer speaker with a load of 300 watts. From a sound pressure of approx. 120 db, a compressor regulates the power in the soft knee setting; the use of the compressor is indicated by an LED on the back. In collaboration with additional subwoofers, two SRMv2s can be turned into a small P.A. in no time. put together, which also accounts for ambitious club sound systems. It should be noted that the boxes are not suitable for unconditional outdoor use. When used in public, the components must be protected from rainwater or moisture.

The horizontal radiation is given as 90 degrees; for the vertical radiation, the tweeter horn is assigned a radiation of 45 degrees. Mackie points out that the usual problem of selective radiation at high frequencies is eliminated with her tweeter horn.   The tweeter horn is recessed approx. 15 centimeters into the housing to protect it from damage during transport. A relatively finely perforated, black steel grille, which was secured with four screws, is used to protect the woofer installed on the rear.

The amplifier unit is located on the back of the box. The central power switch is located next to the cold appliance power socket. The only input connectors are limited to a female and a male XLR connector. You can cascade several systems by connecting the XLR connectors in parallel. This has the advantage that you can initially start with a single pair of speakers and then adapt to the sound requirements by purchasing additional systems. Additional passive speakers cannot be connected to the amplifier unit; the speaker unit works autonomously, so to speak.

Using an automatically controlled “Timed Turnoff” switch, the box switches off automatically below a minimum input level. When it comes to sound control, the low frequencies below 100 Hertz and the high frequencies above 12 kilohertz can be increased by three dB. A low-cut switch lowers the frequencies below 75 Hertz if necessary. Especially for wedge use, you should lower the low bass range; anything in the double-digit range has no place in a floor monitor. A simple input controller is used to determine the input sensitivity for the signal applied. In an emergency, dynamic microphones can also be connected directly due to the gain of up to +40 dB, but these then only have a rudimentary sound control. The interposition of a regular mixer is definitely the better option, but it is nice to know that you can do without this intermediary in an emergency. 22 massive black cooling fins ensure sufficient cooling of the unit.


Practice:

When you press the power switch, a bright blue LED on the front of the device reports the operating status. A switch-on limitation prevents any form of switch-on impulse, so this process takes place absolutely noiselessly. While the woofer operates with absolutely no background noise when in idle mode, there is a quiet humming noise coming from the tweeter horn, which shouldn't be noticeable even at quiet events. In addition, with a pre-amplification of over + 30 db, a slight noise occurs, which, however, will be below the audible limit at the expected volume.

What distinguishes the SRM450v2 from the first sound impression is a very vivid reproduction with a high degree of depth. In contrast to many other vocal systems, which are sometimes unpleasant due to their very tight or harsh reproduction of the signal, the Mackie Box has a kind of “velvety sound” across the entire frequency range. The high-mid range in particular is particularly pleasing thanks to its precise location in the stereo image. If you as an audience have the pleasure of staying within the stereo triangle, you can actually enjoy a spatial stereo image, a fact that is usually lost in the sound system of small events. Here you are more than happy if you can offer the listener audiophile accessibility so that they can actually hear the signal; stereo images are sometimes considered pure luxury here.

The tweeter's radiation behavior as described by Mackie is also not exaggerated; even with a spatial offset of 45 degrees, the listener can still clearly perceive the high-frequency range, which makes it possible to set it up even in difficult terrain. The bass reflex openings on the right and left below the woofer ensure powerful bass. Roaring frequencies via standing waves or housing vibrations could not be heard.



Conclusion:

With the SRM450v2, the traditional American manufacturer of mixing consoles presents a more than solid workhorse that is truly impressive with its performance features. Especially when things have to be done quickly and every meter of cable that needs to be laid is too much, the box can show its strengths.

In terms of price, it's absolutely within the green range, so it's a good idea to buy a small park of SRM450 systems and, depending on the size, use the speakers as stand-alones, in cascade connection or as individual wedges.

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Additional Informations:

Multi-way loudspeaker systems, commonly referred to as multi-way speakers, are essential components in professional audio (PA) setups. These systems are designed to reproduce sound across a wide frequency range by dividing the audio signal into multiple frequency bands, each handled by specialized drivers. The development of multi-way speakers has been a significant milestone in audio engineering, improving sound quality, coverage, and efficiency in various applications from live concerts to public announcements.

### Early Loudspeaker Systems

The roots of modern loudspeaker technology can be traced back to the early 20th century. The first loudspeakers were relatively simple devices, typically consisting of a single driver responsible for covering the entire audio spectrum. These early designs, often horn-loaded for improved efficiency, were limited in their frequency response and sound quality. The single driver struggled to accurately reproduce both low and high frequencies, leading to distortion and poor audio performance.

### Birth of Multi-Way Systems

The limitations of single-driver systems led to the development of multi-way loudspeakers. The basic principle behind multi-way systems is to use multiple drivers, each optimized for a specific portion of the audio spectrum. This approach minimizes distortion and improves clarity by ensuring that each driver operates within its optimal frequency range.

#### Two-Way Systems

The first multi-way systems were two-way designs, featuring a woofer for low frequencies and a tweeter for high frequencies. The introduction of crossovers—electronic circuits that divide the audio signal into separate frequency bands—was a critical innovation. Passive crossovers, which are placed between the amplifier and the drivers, became standard in these early designs. Two-way systems offered significant improvements over their single-driver predecessors, providing better sound quality and higher output levels.

### Advancements in Crossover Technology

As the demand for higher fidelity and more powerful PA systems grew, so did the complexity of crossover networks. Engineers began experimenting with different crossover designs, including active crossovers, which are placed before the power amplification stage. Active crossovers allow for greater precision in frequency band division and offer adjustable crossover points, enabling fine-tuning of the system for specific applications.

### Three-Way and Beyond

The evolution continued with the introduction of three-way systems, which added a midrange driver to handle the frequencies between the woofer and tweeter. This further enhanced the clarity and detail of the sound, as each driver could now operate within an even narrower frequency range. The three-way design became popular in high-end PA systems, providing a more balanced and dynamic sound.

Further advancements led to the development of four-way and even five-way systems, incorporating additional drivers such as subwoofers for ultra-low frequencies and super-tweeters for ultra-high frequencies. These complex systems required sophisticated crossover designs and precise engineering to ensure seamless integration between drivers.

### The Role of Materials and Driver Technology

The evolution of multi-way loudspeaker systems has also been driven by advancements in materials and driver technology. Early loudspeaker cones were typically made of paper, which, while lightweight, had limitations in terms of durability and sound quality. Modern drivers use advanced materials such as Kevlar, carbon fiber, and various composites, which offer superior performance characteristics.

The development of new magnet materials, such as neodymium, has allowed for more powerful and efficient drivers. Neodymium magnets are significantly stronger than traditional ferrite magnets, enabling the design of compact yet powerful drivers that are ideal for multi-way systems.

### Integration with Digital Signal Processing (DSP)

The integration of digital signal processing (DSP) has revolutionized multi-way loudspeaker systems in recent years. DSP allows for precise control over every aspect of the audio signal, including crossover points, equalization, and time alignment. This technology enables engineers to optimize the performance of multi-way systems in real-time, compensating for acoustic anomalies and ensuring consistent sound quality across different environments.

### Applications in Professional Audio

Multi-way loudspeaker systems are ubiquitous in professional audio applications. In live sound reinforcement, they provide the clarity and power needed to deliver high-quality audio to large audiences. Line array systems, which consist of multiple multi-way speaker cabinets stacked vertically, have become standard in concert sound, offering excellent coverage and sound pressure levels.

In installed sound systems, such as those found in theaters, stadiums, and houses of worship, multi-way speakers ensure even coverage and intelligibility, critical for both music and speech. Studio monitors, another application of multi-way systems, provide the accurate sound reproduction needed for recording and mixing music.

### Conclusion

The evolution of multi-way loudspeaker systems has been driven by the quest for better sound quality, higher efficiency, and greater versatility in professional audio applications. From the early days of rudimentary single-driver speakers to today's sophisticated multi-way systems with advanced materials and digital processing, the journey has been marked by continuous innovation and improvement. As technology continues to advance, the future of multi-way loudspeaker systems promises even greater enhancements, further solidifying their role as indispensable tools in the world of professional audio.