My great room is 30 feet long with dining area at one end that is 18 feet wide and living/theater at the other end with a triagular entry area that widens the room out to 27 feet at one end. The ceiling is 11 feet and there is both a doorway and a long serving bar into the kitchen.
My 6.1 set-up is a pioneer VSX-45, M22 mains, M2 surround back, QS8 surround sides, VP150 for center channel, and SVS 25-31 sub.
I have plenty of headroom for volume both for movies and music.
Seems to me that using 2 M22s for rear surrounds is a waste of good speakers. There is little rear content that I'm aware of.
