I'll be sitting anywhere from 10-14ft back. The screen will be 120 inch diagonally. The only one to be behind is the center. I am also planning on doing two in cabinet ep 500's below the screen so the screen will be off the ground roughly 24 inches. That is where the m80's will start at about 24-26inches. If i turn them upside down, I was going to turn them upside down and center the entire speaker with the height of the screen. this would put the tweeters close to ear level, but below mid screen level. Oh and the ceiling is just shy of 8 ft. The room is 18 wide by 19 deep. I like the idea of having the tweets mid screen if it is possible. I'll have to go measure.

Does anyone know if there will be any disadvantages to having them upside down?