I have M60 and my room is 12x14. I place M60 about 9 feet apart and angle speaker to listening position at 60 degree. They sound very good to me ( i seat about 10 feet from tv). I am not an experience listener, but i can feel it sounds great. I wish i can sit about 14 feet away from tv.

By the way, i have vp-100 . It sound clear and loud. One problem is that I can't put center speaker at the same level of main speakers (ideal position), but it's ok to me.