Signal Sensing; Auto Power; Front Panel Controls; To Switch On From Standby Or To Standby - Pro-Ject Audio Systems Amp Box S3 CI Instructions For Use

Trigger
The amplifier can be switched on & off via the 12V DC 2,5mm socket marked Trigger In. Cables are available
as accessories. The remote power-on signal can be relayed to further units via the Trigger Out socket.
Pay attention to the correct polarity of the cable.
RS232 on/off or front panel button on/off can override trigger commands.
Only connect the remote power cable when the pre- and power amplifier are disconnected from the
mains. Failure to observe can result in damage to the circuit.

Signal Sensing

Use the Sig.Sens. dip switch to turn signal sensing on and off. When turned on, the Amp Box S3 CI turns off
automatically when no input signal is detected for 3 seconds (less than 4,4mV over 3 seconds), and
automatically powers on as soon as an input signal is detected (threshold of 4,2mV).
When Signal Sensing is ON, then turning the unit on or off with the front panel button, RS232 or trigger
will not work.

Auto Power

Set the Auto Pwr dip switch to On to enable the Amp Box S3 CI to be turned on as soon as it receives power
from the connected power supply. The power button on the front panel does not need to be pressed anymore
to turn the Amp Box S3 CI on.
When Auto Power is ON, then turning the unit on or off with the front panel button, RS232 or trigger
will not work. Auto Power also overrides signal sensing, the device will always stay on.
RS232
RS232 is a widely used control protocol used in custom integration to remotely control and integrate devices
into a larger system. Home theatre, public address systems, lobby background music, hotels, ....
The RS232 documentation can be downloaded on the product website:
https://www.project-audio.com/en/product/amp-box-s3-ci/#downloads

Front panel controls

To switch on from standby or to standby

The push button on the left side of the front panel turns the unit on or back into standby. The blue LED above
the stand-by push button shows that the unit is switched on.
©Pro-Ject Audio Systems · Amp Box S3 CI · Revision 2024.05.27
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