TEST: SPL Masterbay S

 It's an interesting fact. Although our current DAWs are plastered with mastering software of all kinds, you still find predominantly hardware processors of all types in high-end mastering studios worldwide, which need to be managed. I won't start a new thread about hardware versus software here, but deep down we all know that in the high-end sector, hardware simply sounds better. We only use software solutions out of convenience and budget reasons. The extent to which the consumer hears or even appreciates this is another matter entirely. Germany's number one in professional hardware, the company SPL, set out some time ago to bring its mastering battleship MasterBay to market in a consumer-friendly version under the name SPL MasterBay S. Here now is the long-overdue test report.

The Concept of the SPL MasterBay S

As we all know, the well-known patchbay represents the central interface in every ambitious recording studio when it comes to integrating hardware processors. If you work on a project-by-project basis, you configure your current setup thoroughly once, complete the project, and start the next one with a correspondingly varied setup. So far, so good, but what if you want to compare different processors in an A/B comparison? The personal memorization of the last sound impression is quickly lost during the manual patching process, not to mention the difference in loudness.

What is needed here is a switchable patchbay, which primarily switches various hardware processors as stand-alone or in multiple loop operation during mixdown or as an ambitious AUX extension in console operation, while focusing on the most neutral sound possible and compensating for any level differences. This is where the SPL MasterBay S comes into play, with the letter "S" in this case standing for "Small". In contrast to the battleship MMC2, SPL adapts to the budget range here and offers a very comprehensive loop operation for up to 4 loops, in which individual processors or entire effect chains can be operated.

The Individual Sections of the SPL MasterBay S

Let's start with the corresponding connections on the rear of the product. As befits a professional device, all connections are stereo balanced in XLR. For simplicity, here's a list in table form:

- Main In: Main input, maximum input level +23dBu.
- Rec Out: Output of the processed signal, usually where an interface or converter is placed.
- Monitor Out: Connection for the monitor controller.
- DAW Return: Return of the signal to the DAW.
- Insert Send and Return 1-4: This is where the processors are looped in.
- Metering: Executed in TRS, you can connect a VU or PPM meter to monitor the level values in the recording signal.

The front side of the SPL MasterBay S is no less impressive, but additionally contains some very interesting features that greatly increase the practical value of the device.

Let's start with the trim potentiometer, which ranges from -6 to +6dB. An RK27 from ALPS, nicknamed "Big Blue", known for its high overload resistance and high chamber synchronization, is used. The trim switch above it can also completely remove the potentiometer from the signal path.

The following Insert switches 1-4 switch the corresponding loops. It is recommended to use processors for error correction such as de-essers, de-clickers, or noise reduction in Insert 1. Insert 2 is ideal for dynamic processors such as compressors or limiters. Insert 3 is perfect for equalizers, while Insert 4 is suitable for special effects such as exciters or stereo wideners.

The Bypass switch allows you to compare the original signal with the processed signal at any time. The Input switch allows you to choose between the Main In and DAW Return inputs. This is particularly useful when you want to compare the analog signal with the digital signal from your DAW.

The Monitor switch allows you to listen to either the input signal or the processed signal. This is particularly useful when you want to hear the effect of your processing in real-time.

The Output switch allows you to choose between the Rec Out and Monitor Out outputs. This is particularly useful when you want to send different signals to your recording device and your monitoring system.

The SPL MasterBay S in Practice

The SPL MasterBay S impresses with its clear and intuitive operation. The switches and potentiometers have a high-quality feel and operate precisely. The sound quality is, as expected from SPL, excellent. The device maintains a neutral sound character and does not color the signal noticeably.

One of the great strengths of the MasterBay S is its flexibility. You can easily create complex signal chains and switch between them at the push of a button. This allows for quick A/B comparisons, which is invaluable in the mastering process.

The trim potentiometer proves to be very useful in practice. It allows you to compensate for level differences between different processors or to adjust the overall level of your signal chain. The ability to bypass the trim potentiometer completely is also a nice touch, allowing you to maintain an absolutely clean signal path when no level adjustment is needed.

The metering output is another practical feature. It allows you to connect an external meter to monitor your levels accurately. This is particularly useful in mastering situations where precise level control is crucial.

Sound Quality and Technical Specifications

The SPL MasterBay S boasts impressive technical specifications that contribute to its excellent sound quality:

- Frequency response: 10 Hz - 100 kHz
- Signal-to-noise ratio: > 110 dB
- THD+N: < 0.001%
- Crosstalk: < -90 dB

These specifications ensure that the MasterBay S maintains the integrity of your audio signal throughout the processing chain. The wide frequency response ensures that even the subtlest details in your mix are preserved, while the low noise floor and minimal distortion keep your signal clean and clear.

Comparison with Other Products

When compared to other mastering-grade switching systems, the SPL MasterBay S holds its own. While it may not have all the features of its bigger brother, the MMC2, it offers a more affordable option for those who don't need the full feature set of a high-end mastering console.

Compared to simpler patchbays or manual patching systems, the MasterBay S offers significant advantages in terms of workflow efficiency and sound quality. The ability to switch between different signal chains instantly and perform accurate A/B comparisons is invaluable in a mastering context.

Integration into the Studio Environment

The SPL MasterBay S integrates seamlessly into both professional and home studio environments. Its standard XLR connections make it compatible with a wide range of professional audio equipment. The ability to switch between DAW and analog inputs also makes it a versatile tool for hybrid analog/digital setups.

For smaller studios or project studios, the MasterBay S can serve as the centerpiece of a hardware-based mastering setup. It allows you to incorporate a few choice pieces of outboard gear into your mastering chain without the need for a complex and expensive mastering console.

Potential Improvements and Considerations

While the SPL MasterBay S is an excellent piece of equipment, there are a few areas where improvements could be made:

1. Digital connectivity: In an increasingly digital world, the addition of digital I/O could enhance the unit's versatility.

2. More insert points: While four insert points are sufficient for many users, some may wish for more.

3. Recall functionality: The ability to save and recall routing configurations could be beneficial for users working on multiple projects.

It's also worth noting that to fully utilize the MasterBay S, you need to have quality outboard gear to connect to it. This could represent a significant additional investment for those just starting to build their hardware collection.

The SPL Marc One is a high-end monitor and recording controller that has garnered attention for its excellent build quality, top-tier hardware components, and impressive audio performance. However, like any piece of equipment, it has its known issues and potential weaknesses. Here are some of the notable points:

### Known Issues and Weaknesses

1. **External Power Supply**: One of the primary criticisms of the SPL Marc One is its reliance on an external multi-voltage power supply. This design choice, likely made to save space, means that the device requires an additional power outlet. While the transformer is located directly on the plug (rather than halfway along the power cable), it still occupies a socket on the power strip, which can be inconvenient in setups with limited power outlets[1].

2. **Limited I/O Channels**: The built-in interface of the Marc One features only two inputs and two outputs. While this might be sufficient for many users, those requiring more extensive I/O capabilities might find this limitation restrictive. The focus on quality over quantity is evident, but it does place the Marc One in a different category compared to more feature-rich alternatives[1].

3. **USB-B Port**: The use of a USB-B port instead of the more modern USB-C might be seen as a drawback by some users. As the industry gradually shifts towards USB-C for its enhanced capabilities and compatibility, the absence of this port on the Marc One could be a point of contention. However, the USB-B port does offer greater compatibility with existing setups, and USB-C is backward compatible with appropriate adapters[1].

4. **Solo Operation Design**: The SPL Marc One is primarily designed for solo operation. This is evident from the solitary headphone output and the fact that both the monitors and the headphone output can only be fed with the same signal. This design choice makes it ideal for individual producers who prioritize high fidelity but might not be suitable for collaborative environments where independent mixes are required for multiple listeners[1].

5. **No Rack Mounting Option**: The Marc One is designed exclusively for desktop use, with no provision for rack mounting. This could be a limitation for users who prefer or require rack-mounted equipment to save desk space or for better integration into their existing studio setups[1].

### Additional Considerations

1. **Component Quality**: The SPL Marc One uses high-quality components, such as the AKM AK4490 chip for its DAC, which supports 32-bit at 768 kHz and DSD4 and DSD256. This ensures excellent sound quality but also means that the device is best paired with equally high-quality monitors and headphones to fully utilize its capabilities. Investing in high-end speakers and headphones is recommended to avoid bottlenecks in the signal chain[1].

2. **Trim Potentiometer**: The trim potentiometer, which ranges from -6 to +6 dB, is a useful feature for adjusting input levels. However, some users might find the need to manually adjust this setting a minor inconvenience, especially in dynamic recording environments where levels can change frequently[1].

3. **Crossfeed Control**: The crossfeed control, borrowed from SPL's Phonitor series, is designed to simulate the natural crosstalk of speakers when using headphones. While this feature adds flexibility and enhances the listening experience, it might not be necessary for all users, particularly those who primarily use speakers for monitoring[1].


Conclusion

The SPL MasterBay S is a well-designed and high-quality tool that brings professional-grade mastering capabilities to a wider audience. It offers a level of flexibility and control that is typically only found in much more expensive mastering consoles.

For project studio owners looking to incorporate hardware into their mastering chain, or for professional mastering engineers seeking a more affordable alternative to high-end mastering consoles, the MasterBay S represents excellent value. It allows for complex routing and instant comparisons, which can significantly streamline the mastering workflow.

The build quality is excellent, as we've come to expect from SPL, and the sound quality is transparent and clean. While there are a few areas where improvements could be made, these are minor considerations in the context of the overall package.

In summary, the SPL MasterBay S is a powerful and flexible tool that can significantly enhance your mastering capabilities. It bridges the gap between software-based mastering and high-end hardware solutions, offering a taste of professional-grade mastering workflows at a more accessible price point. For those serious about improving their mastering setup, the MasterBay S is certainly worth considering.