INSTRUCTIONS FOR USE
Pro-Ject Head Box S2
© Pro-Ject Audio Systems · Pro-Ject Head Box S2 · Revision 2017.09.05
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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
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.
Connection to the amplifier / signal sources
Connect the Fixed output of your amplifier or source (like CD players, streamers, D/A converters, etc) to the
In RCA sockets of the headphone amplifier.
Bypass output
The unit is equipped with a pair of analogue loop output RCA sockets on the back panel, this output will
pass on the signal untouched to an additional amplifier. Connect the Out RCA socket to a line input on your
amplifier.
© Pro-Ject Audio Systems · Pro-Ject Head Box S2 · Revision 2017.09.05
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Front panel
Headphone connection
The unit offers two sockets for headphones: one 3.5mm jack and one 6.3mm jack. Headphone outputs can
be used simultaneously.
In case of using two headphones at the same time, the output power is split into each headphone
according to their impedance values
Stand-By
The button on the front panel of the unit alternately turns the power on or returns it to standby mode. The blue
LED above the stand-by push button shows that the unit is switched on.
Volume
Adjust the volume to the desired level by using the knob on the right side of the front panel. Listening at too
loud volumes can damage your hearing, we advise to listen at moderate levels.
© Pro-Ject Audio Systems · Pro-Ject Head Box S2 · Revision 2017.09.05
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Technical data
Output power 725mW (into 32ohms)
Signal to noise ratio -110dBV
THD +N < 0.002%
Gain 11dB
Crosstalk 68dB
Frequency response 20Hz - 80kHz (+- 0,2dB)
Analogue inputs 1 pair RCA/Cinch
Headphone output 1x 6.3mm jack, 1x 3.5mm jack
Analgoue loop out 1 pair RCA/Cinch
Power supply 5V/0.5A DC
Standby Power Consumtion <0,5W
Dimensions W x H x D 103 x 37 x 120mm
Weight 365g without power supply
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.
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