Pro-Ject Audio Systems Head Box S2 Digital User manual

INSTRUCTIONS FOR USE
Pro-Ject Head Box S2 Digital

© Pro-Ject Audio Systems · Pro-Ject Head Box S2 Digital · Revision 2017.08.29
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Dear music lover,
thank you for purchasing a Pro-Ject Audio Systems headphone amplifier.
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.
Connectors
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 possibilities:
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 socket on the back panel. Connect the Output RCA
socket to a line input on your amplifier.
Headphone connection
Connect a headphones to the socket on the front panel (Jack 6,3mm). Rear output is muted when
headphones are in use.

© Pro-Ject Audio Systems · Pro-Ject Head Box S2 Digital · Revision 2017.08.29
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Inputs
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.
Driver installation (Windows® operating systems only)
* For Windows®operating systems an USB driver (supplied on CD) has to be installed. Mac OS®operating
systems do not need an additional driver.
For example - Windows 7®and newer operating system:
Control Panel Hardware and Sound Sound Playback:
select Speaker/ProJect Head 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
Windows 10 operating systems support 24/192 playback (wasapi), installation of supplied (ASAPI) driver is
not necessary.
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 appropriate cables to connect to sources of digital signal like CD players,
streamers, TV set etc.
Front panel
Volume
Adjust the volume to the desired level using the knob on the right side of the front panel.
Input selector
After the unit is powered on, operating the button Input selects the inputs in turn. The selected input is
indicated by the LED´s (1-USB, 2-Co-axial, 3-Optical). Blinking LED indicates no signal.
DSD
LED is illuminated when streaming DSD data over USB input. (playback of DSD on Windows computer
requires driver from supplied CD) and a software player capable of playing DSD files.

© Pro-Ject Audio Systems · Pro-Ject Head Box S2 Digital · Revision 2017.08.29
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Filters
Filter button select filters in turn:
1 - Optimal Transient
2 - Fast Roll off (Linear Phase Fast Roll off)
3 - Slow Roll off (Linear Phase Slow Roll off)
4 - Minimum Phase (Minimum Phase Slow Roll off)
5 - Apodizing Hybrid
Filter setting and selected input are stored after turn off the unit.
Technical data
Digital inputs 1x USB (B), 1x Co-axial (RCA), 1x Optical (TOSLink)
D/A-converter 1x ESS9038K2M 32-bit
Playback formats USB: up to DSD256, PCM up to 32b/768kHz
Optical: PCM up to 24b/96kHz
Coaxial: PCM up to 24b/192kHz
Filter settings 5 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
THD 0,0007% at 0dB, 2V RMS, 1kHz
Dynamic range 120dBA
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): 360g
Service
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.
Warranty
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
Corporation.