User Manual - Box Design by Pro
Pro-Ject Pre Box S2 Digital
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
Important notice
Safety instructions
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.
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
© Pro-Ject Audio Systems · Pro-Ject Pre Box S2 Digital · Revision 2017.09.04
Headphone connection
Connect the headphones to the socket on the front panel (Jack 6,3mm). Rear output is muted when
headphones are in use. Green headphone icon in the left top corner of the display indicates active
headphone output.
The unit offers 3 digital inputs: USB, Optical and Co-axial
USB: is dedicated for connection to a Computer. Connect the USB input of the unit to a free USB-socket on
your computer and turn it on/make sure it is powered on.
Windows® 10 operating systems support 24/192 playback (wasapi), installation of supplied (ASIO) driver is
not necessary.
Driver installation (Windows operating systems only)
For playing DSD files an USB driver (supplied on CD) has to be installed.
For example - Windows 7® and newer operating system:
 Control Panel  Hardware and Sound  Sound  Playback:
select Speaker/ProJect Pre Box S2 Digital
 Properties  Supported formats: make sure nothing is assigned
 Level  Sound: setting must be 100
 Enhancements: disable all enhancements  Advanced  Default Format: set to studio quality 24/192
Please note: Connection should be made to an USB-socket of your computer directly. Connecting to
USB-hubs or switches can cause problems.
Co-axial and Optical: Use apropriate cables to connect to sources of digital signal like CD players,
streamers, TV set etc.
Remote control - Aluminium
(optional accessory, standard plastic version has the same buttons)
MUTE activates and deactivates mute. Mute is indicated on the display.
Filter selects filters in turn
Menu access/exit menu, ↑ and ↓ change pages in menu, ▐◄◄ and
►►▌change value. OK exit menu
Volume + and - set volume level
▐◄◄ , ►►▌, ►▌▌allows to control player in computer: track +,
track-, play/pause
© Pro-Ject Audio Systems · Pro-Ject Pre Box S2 Digital · Revision 2017.09.04
Front panel
Adjust the volume to the desired level from -80dB to 0dB, using the knob on theright side of the front panel.
Volume settings are stored separately for headphone output and RCA output.
Input selector
After the unit is powered on, operating the buttons marked with Input ▲,▼ select the inputs. The selected
input is indicated by its name (USB, OPT, COAX) when changed and then by a small icon in the bottom left
corner of the display. Small icon of selected input indicates whether the input is connected to the source or
not: white - connected, red - not connected
Sampling frequency (or DSD rate) of the input signal is displayed in the right bottom corner of the display.
front panels menu control:
Input buttons: list between pages
Volume changes the value
pages in menu offers following settings:
Distortion Compensate - enable / disable ESS on-chip distortion compensation feature
Audio Quality - test/Best : test: gives the best value when tested on measuring device (lowest distortion etc)
Best : Pro-Ject designers preffered sound setting.
SW version - display sw version
Filter setting
Optimal transient (Pro-Ject preffered)
Fast Roll off (Linear phase)
Slow Roll off (Linear phase)
Minimum Phase Fast
Minimum Phase Slow
Linear Apodizing
Hybrid Filter
Brickwall Filter
Filter setting and selected input are stored after turn off the unit.
© Pro-Ject Audio Systems · Pro-Ject Pre Box S2 Digital · Revision 2017.09.04
Technical data
Digital inputs
Playback formats
1x USB (B), 1x Co-axial (RCA), 1x Optical (TOSLink)
2x ESS9038Q2M 32-bit
USB: up to DSD512 (DSD1024), PCM up to 32b/768kHz
Optical: PCM up to 24b/192kHz
Coaxial: PCM up to 24b/192kHz
Filter settings
8 different selectable on front
Frequency response
20Hz - 20kHz
Analogue outputs
6.3mm Headphone (front), 1x Variable Out (RCA)
Output voltage
2,05 Veff
Minimal recommended headphone impedance 8ohms
Headphone output power
6,6mW/600ohms, 68mW/32ohms
0,0003% at 0dB, 2V RMS, 1kHz
Dynamic range
Outboard Power supply
5V/1A DC (included)
Dimensions W x H x D
103 x 37 x 122 mm (including knob and connectors)
Weight (without power supply): 366g
Should you encounter a problem which you are not able to alleviate or identify, please contact your dealer for
further advice. Only if the problem cannot be resolved there, the unit should be sent to the responsible
distributor in your country.
The manufacturer accepts no responsibility for damage caused by not adhering to these instructions
for use. Modification or changes to any part of the product by unauthorized persons release the
manufacturer from any liability over and above the lawful rights of the customer.
Copyright, trademarks
Pro-Ject Audio Systems is a registered Trademark of
H. Lichtenegger.
This guide was produced by: Pro-Ject Audio Systems
Copyright © 2017. All rights reserved.
The information was correct at the time of going to
press. The manufacturer reserves the right to make
changes to the technical specification without prior
notice as deemed necessary to uphold the ongoing
process of technical development.
Windows®, Windows XP®, Windows Vista®, Windows 7®, Windows 8®, Windows 10® are trademarks of the
Microsoft group of companies. Mac® and Mac OS® are trademarks of Apple Inc., registered in the U.S. and
other countries. TOSlink® is a registered trademark of Toshiba corporation. Dolby® is a registered trademarks
of Dolby Laboratories. DTS™ is a registered trademark of DTS, Inc. DSD is a registered trademark of Sony
© Pro-Ject Audio Systems · Pro-Ject Pre Box S2 Digital · Revision 2017.09.04
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