Pro-Ject Pre Box S2 Digital
Pre Box S2 Digital Digital micro preamplifier with MQA and DSD512 support
MSRP 399 € (incl. VAT)MSRP 399 € (incl. VAT)
- Dual mono construction
- High end ESS Sabre ESS9038 dual DAC
- Proprietary clock circuity design
- Organic polymer capacitors and thin film mini MELF resistors
- MQA hardware decoding
- DSD64, DSD128, DSD256 & DSD512 (DSD over PCM)
- Up to 24bit/192kHz for optical & coax inputs
- 7 selectable digital filter characteristics
- 1 proprietary optimum transient digital filter
- Headphone output on the front (6.3mm)
- Synchronization of all internal oscillators
- Jitter as low as 100 Femtoseconds!
- Gold plated four layer PCB
- Full alu/metal enclosure in silver or black
Aluminium Color options:
3 digital inputs: 1x coax (S/PDIF), 1x optical (TOSlink®), USB B
D/A-converter: 2x ESS9038Q2M 32-bit PCM 768kHz / DSD512
Headphone amplifier chip: ESS9602
Sampling rates: 32/44,1/48/88,2/96/176,2/192/352,8/384/768 kHz
DSD support: DSD64, DSD128, DSD256 and DSD512
MQA support: full MQA unfolding by hardware
Filter settings: 8 different selectable on front
Frequency response: 20Hz – 20kHz
Analogue out: 6.3mm Headphone Out (front), 1x Variable Out (RCA)
Output voltage: 2,05 Veff
Headphone output power: 68mW (32Ohms)
THD: 0,0003%
Dynamic Range: 124dBA
Power consumption: 5V, micro USB
Dimensions: 103 x 37 x 122 mm (including knob and connectors)
Weight: 366g without power supply
PRODUCT INFORMATION
Pre Box S2 Digital – a performance revolution in a small package!
Pre Box S2 Digital marks a new era for our S-series components, for the very
first time we are using a dual mono configuration with the highest class D/A
converters of ESS Sabre, their flagship DAC chip ensures highest class audio
in a small and affordable pack- age. This DAC is capable of high resolution
audio up to 32bit 768kHz PCM and DSD512!
Pre Box S2 Digital is also the very first of our devices to support hardware
MQA unfolding. It’s also the premiere of our proprietary Optimum transient
digital filter and our proprietary clock circuitry design. Digital audio is
the art of time, with our new proprietary clock design we have managed jitter
rates of unrivalled 100 Femtoseconds, this easily outperforms many renowned
and respected audiophile clock generators! With organic polymer capacitors and
thin film miniMELF resistors we were able to create a tiny device that will
blow away even much bigger components for a much higher price.
With a total of seven digital filters the sound can be shaped precisely to the
listeners liking. Pre Box S2 Digital is fully remoteable, it can also control
the playback software of a computer. You can use Play, Pause, Forward and
Rewind straight with your Pre Box S2 Digital!
First class components from first class manufacturers!
We are using dual DAC 2 x ESS9038Q2M – the newest generation of SABRE Digital
to Analog Converter. The new benchmark in audio excellence. The ES9038 SABRE
DAC is a high-performance 32-bit digital to analog converter
and uses ESS’s patented 32-bit Hyperstream II modulator architecture and Time
Domain Jitter Eliminator. It is the first SABRE DAC to use new Dual-DAC
architecture
to further enhance performance. It also delivers an unprecedented dynamic
range of up to 129dB and total harmonic distortion plus noise of -120dB
(THD+N) – a performance level that will satisfy the most demanding audio
enthusiasts.
ESS9602 – headphone amplifier and output buffer. Supports a dynamic range of
up to 122dB and THD+N of -117dB with 600ohm loads. Additionally, we
implemented a unique feature that improves THD+N with 32ohm loads to -112dB in
Best Performance mode. ESS9311 – is the industry’s first low-noise, low-
dropout regulator designed specifically for high-performance audio systems. It
is optimized for high resolution audio thanks to its revolutionary dual
regulator architecture. This innovative architecture contains series-voltage
and shunt-voltage elements, eliminating the need for output decoupling
capacitors – an industry first in audio system design. The ESS9311 provides
the extremely. low-noise outputs that are necessary for driving the reference
inputs of audio converters and offers significant value-add for audio system
designers.
Organic polymer capacitors are used in critical positions like the analogue
power supply. These capacitors are very low thermal drift which result in
consistent playback performance. Precision Thin Film MELF resistors – such
resistors has very low voltage coeficient. It results in perfect sounds
without impurities. 16-core XMOS USB chip for asynchronous USB data transfer
and MQA unfolding. Gold plated four layer PCB with extra shielding for
achieving optimal audio performance. Full colour OLED display for indication
of volume level, selected input, sample rate and type of input digital signal.
Synchronization of all oscillators
This extremely important feature is almost always overseen. Imagine an
orchestra without a drummer or a conductor. Every musician plays in his own
rhythm and tempo. The result is chaos which nobody can listen to. The same
applies to oscillators in a DAC. There are a lot of oscillators with different
frequencies and they start to talk chaotically – what could the result be? The
complete opposite happens when all the oscillators are perfectly synchronized
and work like an orchestra with the perfect conductor. This results in low
jitter, minimizing of interference and it is very important for good
sound.
Double filtering for a noise free USB input
One of the major problems for USB DACs is the transmission of unwanted noise
coming through the USB output. A lot of research of Pre Box S2 Digital went
into how to make this noisy connection more quiet. After a lot of
headscratching trial and error we found the solution to lie in active and
passive filtering of the output.
Typical USB output from personal computers:
We can see that the noise floor at 1kHz is about –75dB and at 10kHz it is
about –110dB.
The result can be seen here: USB output after passive filtering
After applying passive RF interference filtering the results are already
remarkable. Noise on 1kHz drops to –125dB, at 10kHz Noise comes even close to
–160dB. But they improve even further when applying an active filter after the
passive filtering.
This is the USB output noise after double filtering: USB output after
active filtering
The results are limited by the capabilities of the measuring equipment and
noise floor lays at –160dB or even lower. There are visible peaks at 50Hz and
100Hz which are caused by limits of the measuring instruments. However, they
are at a level of –130dB and –140dB.
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INSTRUCTIONS FOR USE
Pro-Ject Pre Box S2 Digital
© Pro-Ject Audio Systems · Pro-Ject Pre Box S2 Digital · Revision 2017.09.04
Dear music lover,
thank you for purchasing a Pro-Ject Audio Systems preamplifier.
In order to achieve maximum performance and reliability you should study these instructions for use carefully.
Warning of a hazard for the user, the unit or possible misuse
AC outlet voltages vary from country to country. Before connecting to the mains, make sure that the
voltage in your area meets the voltage requirements printed on the power supply.
The power supply is used to disconnect the unit from the mains. Make sure that the power supply is easily
accessible at all times. Never handle the device or the power supply while your hands are wet or damp.
Avoid letting liquids enter the device or the power supply. Never place any item containing liquid, such
as a flower vase on or near the device. Never spill any liquid on the device or the power supply. Never
place any naked flame sources, such as lighted candles on or near the device. The product shall not be used
in damp or wet locations, next to a bathtub, sink, swimming pool or any other similar conditions.
Make all connections whilst the preamplifier is disconnected from the power supply
Take care to connect the left and right channels correctly. The right channel is usually marked red,
the left channel black or white.
Mains power connection
The unit offers 2 possibilties:
1. USB input is not used: Connect the low voltage plug from the power supply to the micro-USB socket Power
5V DC before connecting the power supply to the mains.
2. USB input is in use: Unit can be powered directly from computer via USB input. In this case is highly
recommended to disconnect Power 5V DC cable from the unit — power disturbances from two power supplies
could affect sound performance.
Outputs
The unit is equipped by a pair of analogue output RCA sockets on the back panel and a headphone output
connector (Jack 6,3mm) on the front panel. Connect the Output RCA socket to a line input on your
amplifier.
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FAQ: Types of Manuals and Their Contents
Box-Design Pro-Ject Pre Box S2 Digital Manuals come in various types, each serving a specific purpose to help users effectively operate and maintain their devices. Here are the common types of Box-Design Pro-Ject Pre Box S2 Digital User Guides and the information they typically include:
- User Manuals: Provide comprehensive instructions on how to use the device, including setup, features, and operation. They often include troubleshooting tips, safety information, and maintenance guidelines.
- Service Instructions: Designed for technicians and repair professionals, these manuals offer detailed information on diagnosing and repairing issues with the device. They include schematics, parts lists, and step-by-step repair procedures.
- Installation Guides: Focus on the installation process of the device, providing detailed instructions and diagrams for proper setup. They are essential for ensuring the device is installed correctly and safely.
- Maintenance Manuals: Provide guidance on routine maintenance tasks to keep the device in optimal condition. They cover cleaning procedures, part replacements, and regular servicing tips.
- Quick Start Guides: Offer a concise overview of the essential steps needed to get the device up and running quickly. They are ideal for users who need immediate assistance with basic setup and operation.
Each type of Box-Design Pro-Ject Pre Box S2 Digital instruction is designed to address specific needs, ensuring users have the necessary information to use, maintain, and repair their devices effectively.
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Box-Design Pro-Ject Pre Box S2 Digital Amplifier PDF User Guides and Manuals for Free Download: Found (1) Manuals for Box-Design Pro-Ject Pre Box S2 Digital Device Model (Instructions For Use)
Box-Design Pro-Ject Pre Box S2 Digital Instructions For Use
Details:
- Manufacturer: Box-Design
- Product Name/ID: Box-Design Pro-Ject Pre Box S2 Digital / #955791
- Category: Amplifier
- File Path: box-design/pro-ject-pre-box-s2-digital_955791.pdf
- Last Updated: 20 May 2025
- Description: The Box-Design Pro-Ject Pre Box S2 Digital manual offers essential guidance for mastering your device, including setup procedures, user interface navigation, and routine maintenance tips for optimal use.
- Document Type: User Manual
- Pages: 5
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The Box-Design Pro-Ject Pre Box S2 Digital is an impressive piece of audio equipment that caters to both the audiophile and the casual listener. With its compact size and high-quality components, this preamplifier not only looks good on your shelf but also enhances the overall audio experience. In this review, we will delve into its features, performance, and overall value, providing a comprehensive look at what makes this device stand out in a crowded market.
One of the most significant aspects of the Pro-Ject Pre Box S2 Digital is its versatile input options. It supports multiple digital inputs, including USB, coaxial, and optical connections. This flexibility allows users to connect a wide range of devices, including computers, CD players, and digital audio players. The ability to handle high-resolution audio formats makes it a great option for those looking to delve deep into their music collection.
Another noteworthy feature is the DAC (Digital-to-Analog Converter) housed within the Box-Design Pro-Ject Pre Box S2 Digital. It utilizes the acclaimed AKM AK4493EQ DAC chip, which is known for its excellent distortion performance and wide dynamic range. The result is a more natural and detailed sound, allowing the nuances of your favorite tracks to shine through.
The build quality of the Pro-Ject Pre Box S2 Digital is also commendable. With a solid metal housing and a sleek, minimalist design, it not only looks good but feels durable and well-crafted. The layout is user-friendly, with easy access to input selections and volume control, allowing for a seamless user experience. For those who value aesthetics alongside performance, this product does not disappoint.
Performance-wise, the Box-Design Pro-Ject Pre Box S2 Digital delivers a transparent and clean sound signature. Users have reported an improvement in clarity and detail compared to their previous setups. The unit excels at providing a lush midrange, which is crucial for vocals and instrumental performances. Additionally, the high frequencies are crisp without being harsh, making this preamp well-suited for a variety of music genres.
Here are some key features of the Pro-Ject Pre Box S2 Digital:
- Multiple digital inputs: USB, coaxial, optical
- High-quality AKM AK4493EQ DAC chip
- Compact and stylish design
- User-friendly interface with easy controls
- Support for high-resolution audio formats
In terms of value, the Box-Design Pro-Ject Pre Box S2 Digital is competitively priced, especially considering the high-quality components and performance it offers. For those entering the world of high-fidelity audio or looking to upgrade their existing setup, this preamp provides an excellent balance of affordability and performance. It’s hard to find another device that delivers this level of sound quality at a similar price point.
However, it’s essential to consider the context of its use. While the Pro-Ject Pre Box S2 Digital shines in a well-configured audio setup, it may not be the best choice for those who prefer analog connections since it primarily focuses on digital inputs. Additionally, some users have noted that the unit can run a bit warm during extended use, which could be a consideration for placement in an audio rack or shelf.
In conclusion, the Box-Design Pro-Ject Pre Box S2 Digital is an exceptional digital preamp that packs a punch with its advanced features and superior sound quality. Its compact design and user-friendly interface make it an excellent choice for both newcomers to high-fidelity audio and seasoned audiophiles alike. If you’re seeking a budget-friendly solution that does not compromise on performance, this preamp deserves serious consideration.