User Manual - Box Design by Pro
Pro-Ject Head Box S USB
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, 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.
Pro-Ject Audio Systems, Vienna, Austria
Make all connections, except the connection to the computer and the headphone, whilst the unit 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.
Never use any other power supply than the one supplied with the unit.
Connection to the amplifier (recorder)
Connect the TAPE / RECORD OUT RCA/phono sockets from your amplifier to the In RCA/phono sockets of
the headphone amplifier. As the analog input signal is relayed to the RCA/phono sockets Out, the Out
RCA/phono sockets of the headphone amplifier can be connected to the input sockets of your recorder.
Alternatively analog sources like CD player or tuner can be reconnected to the In RCA/phono sockets directly.
Connecting to a Computer
Connect the USB-input of the headphone amplifier (unit must be switched on) to a free USB-socket on your
computer and turn it on/make sure it is powered on. The amp will be automatically recognised by the
computer. There is no need to install a driver manually.
Please note: Connection should be made to an USB-socket of your computer directly. Connecting to
USB-hubs or switches can cause problems.
Mains power connection
Connect the low voltage plug from the power supply to the Power 18V socket before connecting the power
supply to the mains.
© Pro-Ject Audio Systems · Pro-Ject Head Box S USB · Revision 2015.4.2
Front panel controls
Head Box S USB
Please turn the volume level to minimum before connecting the headphone.
Minimum impedance of the head phone 30ohms.
To switch on from standby or to standby
The push button on the left hand side will toggle the unit between its fully operational status and standby. The
blue LED above the stand-by push button shows that the unit is switched on.
Input selector
Pressing the grey button next to the two LEDs repeatedly selects the inputs in turns. The selected input will be
shown by the corresponding LED on the Head Box S USB.
Important notice
Connecting a headphone, volume control
Connect the headphones to the ¼“ (6,3mm ) jack socket on the front of the headphone amplifier. Use the
control knob to adjust the level to the required volume.
Headphone replay
Use the input selector of the amplifier or the headphone amplifier to choose the source you wish to hear.
Potential incorrect use and fault conditions
No signal on one or both channels:
No connection between headphone and headphone amplifier ore amplifier. This could be due
to a faulty plug, broken wire or solder joint or simply loose plug/socket connection.
Headphone does not work:
Headphone volume control is at minimum.
Amplifier Tape-Monitor circuit is not activated.
© Pro-Ject Audio Systems · Pro-Ject Head Box S USB · Revision 2015.4.2
Technical specifications Pro-Ject Head Box S USB
Power output:
Headphone connection:
Signal to noise:
Frequency response:
Headphone jack:
Line-level input:
Line-level output:
350mW/30ohms, 60mW/300ohms
112dB (A weighted) at full output
20Hz - 20kHz/-0,7, 0dB
3-pole ¼“ (6,3mm ) co-axial jack
1 pair RCA/phono sockets
1 pair RCA/phono sockets
Burr Brown PCM2702E
16-Bit Delta Sigma, 8-fach Oversampling
Sampling rates:
44,1kHz and 48kHz
USB input:
5 pin mini b connector
USB signal:
digital serial data protocol USB 1.1
Operating systems:
Windows XP®, Windows VISTA®, Windows 7® and Mac OS®
Outboard power supply:
18V/500mA DC, suitable for your country's mains supply
Power consumption:
250mA DC, <1W in standby
Dimensions W x H x D (D with sockets): 103 x 36 x 104 (109)mm
600g without power supply
Should you encounter a problem which you are not able to alleviate or identify despite the above information,
please contact your dealer for further advice. Only when the problem cannot be resolved there should the
unit 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 change 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.
This guide was produced by: Pro-Ject Audio Systems
Copyright © 2015. 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 XP®, Windows Vista®, Windows 7® and Windows 8® 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.
Dolby® is a registered trademark of Dolby Laboratories. DTS™ is a registered trademark of DTS, Inc..
© Pro-Ject Audio Systems · Pro-Ject Head Box S USB · Revision 2015.4.2
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