I know you said "NOTE: Not to Scale," but I'm a little concerned about the one black line you have designated as a wall; the one right next to the center channel. Unless you can get the front of whatever speaker you use as a center speaker out into the room past the edge of the wall, it seems to me that it will be blocking a large part of the left side of your room, and causing reflections to the right side. The other wall may cause a similar problem with the left front M60. If that part of the drawing is inaccurate, and the walls will NOT be blocking anything, then NEVER MIND!
