Henry, many people do what your asking, should not be a problem as long as you calibrate all the speakers initially via SPL meter or other setup routine.

Does this design reroute unused power to the other channels needing the power, like Tom's design, that was a nice feature?
M80s-VP180-QS8s-EP600-2xEP350 Denon3808 Outlaw7700
(M22-OWM22-VP100)-all in storage