Alex,

When I turn up my 90W/channel amp "too much", the sound muddies because I end up getting too many reflections from my room's surfaces. By too much, I'm referring to about 15W/channel nominal in my 4,000 cubic foot space.

I keep wondering how much I'm going to have to spend on sound treatments if I want to take advantage of a few hundred watts in a new amp \:\) .

House of the Rising Sone
Out in the mid or far field
Dedicated mid-woofers are over-rated