This is a question that has arisen in another thread, so don't give me credit for the idea

If I take the two front outputs and two rear outputs of my amp (Denon 1602) and use them to bi-amp my M80's, then set the receiver the 5 channel stereo (to ensure there is actually sound going to them), will this work, or will it damage my speakers?

I assume I would have to set the dB gains identical. Any other advice?