I have noticed in our new house with the speaker so close - the living room is 14x18 with the speakers about 10 feet from the couch - the sound seems somewhat "dull" or "empty" compared to before unless I turn it up pretty loud. maybe that is due to the lower power from my Denon vs the QSC amp from before? Currently I am using the back 2 channel from the Denon to power the outdoor speakers, I guess I could try to biamp the 20s to improve the sound but wouldnt that make it hard to get the center channel level to match?