Thanks!

mahansm, is there a safe way for a non-tech type to measure the gain of the amp? Would that be the V in your formula?

With 6 ohm speakers, would the R in your formula be 6?

gonk, If I'm following you, a 7700 can deliver 1400 watts at 15 amps, so approximately 93.3 total watts per amp measured? I'm assuming a 7500 is the same as a 7700 minus 2 channels.

If I was only using 2 channels, then I'd be near 190 watts per channel near 4 amps?