PA-400 mixer power amplifier

[Rikki]

Dear Forum users,

I have recently bought an old PA-400 mixer power amplifier (see attached pictures). I intend to send a stereo signal from a guitar effects board to the amplifier (either through A B inputs or AUX input), however, I can only get a mono signal to the speakers. Does anyone know if the PA-400 does not support stereo signal out? I have read the manual, which does not mention mono or stereo output at all.

Best,
Rikki

[Enzo]

It is a mono amp.

You will note that each channel does not have a pan or balance control. There is only one power amp in the thing.

[dak]

To put a bit of perspective on it: stereo does not make much sense with long-throw speakers (too much cancellation and/or too little spatialisation) and 400W does not make much sense with short-throw speakers. So there is a point in using one or several mono amps without shared instrumental sources on stage. Stereo effects and mixes are more useful for recording/broadcasting or for comparatively small venues. But for the latter, going by instrument amps may be simplest again unless you prefer giving a sound guy the last word on your acoustic footprint.