Look at my system in my signature. The curious thing is is that the 7500 runs quite cool and in fact runs all 5 channels very hard on the fronts and center (bi-amping the fronts). so the 2200 only run one surround speaker with the scant info sent to them. Even when no audio is being sent, the speakers seem quite warm to the touch . . . heating pad warm. I don't really mind it, but I can help but think these things are 1) wasting electricity and 2) maybe not very efficient.

Thoughts?