Quote:
Originally posted by Otto:
Hi there,


I see what Altec is saying, but I've never tried it. I see that he's making an assumption about while channel maintains uninverted polarity ("usually the left"), so it's possible that you will run into polarity problems with respect to your other speakers. In general, I see how this implementation could work, but I wouldn't personally do it without understanding exactly what's going on. You could figure it out empirically if you have an oscilloscope.


Good luck!
It's not an assumption on my part, but it is the way amps work in bridged mode. In "bridging" the ONLY thing that is going on is that the same signal is sent to the two channels, one being inverted. When connecting to the two "red" terminals, the voltage difference between them is double because of the polarity inversion, thus 4 times the power output (in a perfect amp).

The regular single ended signal is still available on the two outputs of the amp on the "red" and "black" terminals, at the normal power levels for the amp, and there is no reason you can't use them instead of taking the signal from the two red terminals.

Doing this is just a simple way to get the same mono signal to go to the two channels. The only thing that has to be done is to reverse the speaker leads on the channel which has been inverted in polarity.