This is my gym (16'x16'x8') and now it serves as a gym & a listening room. The room treatment consists of Soffit Bass traps (17" squared) from floor to ceiling behind the speakers as well as 7" thick Monster traps. There are also 7" Monster traps at the first reflection points on the sides and 5" bass traps on the ceiling at first reflection. And corner traps at the back corners of the room. The black & white panels are combination 4" bass traps with diffusors on the front & they are at the front & back of the room. As well there's a wool rug on the floor. The diffusion panels are mounted on the wall behind the rack and everything else is freestanding & able to be moved. The traps on the side walls are elevated on dumbbells to get a better height.