Is there anyone out there experienced with diffusors? I'm thinking of putting something on my rear HT wall, but I'm not sure how many I should use. My rear wall is 7'H x 13'W. Seating position is 12 feet from rear wall, and the floor is carpeted. In the middle of the rear wall is a velvet curtain 2'W x 7'H. The front wall is treated with absorbers. I was thinking of using 2 2'x2' RPG skylines on each side of the window (spaced and staggered). Should I use more? going with the LEDE concept here. Thoughts?