Wow! Thanks everyone for the great information. I just returned home and poped in Return of the King to test the sub. I cranked it up a bit, not enough to disturb the neighbors, but enough to get full effect. The sub light went from red to green. Maybe, at low volume levels, the LFEs can be handled by the M80s. But at higher outputs, the signals are sent to the sub. I don't know for sure, but it seems logical.

Thanks again!

Axiom stuff, Denon stuff, & Sony stuff