I am finishing up a studio in my basement and I have started looking into diffusors for the back wall. I have absorption covered using Owens Corning 703's in clouds and wall panels, and I'll have it in the corners for bass traps. All of that is pretty straight forward, but in the realm of diffusion there are so many options (and costs). Most of these below have an open back where you can insert 703 for low end absorption (below 500 hz) but that's not the case with doing the homebuilt version at the bottom. Also, the Space Coupler methodology seems interesting - thoughts? If any of you have reasearched or know more about which method of diffusion works well please let me know. Here are some manufacturers. GIK (http://www.gikacoustics.com/gik_d1_diffusor.html): Real Traps (http://www.realtraps.com/diffusor.htm): Auralex Metro Fusor (http://www.auralex.com/sound_diffusor_metrofusor/sound_diffusor_metrofusor.asp): Auralex T Fusor (http://www.auralex.com/sound_diffusor_tfusor/sound_diffusor_tfusor.asp) : Auralex Space Coupler (http://www.auralex.com/partscience/spacecoupler.asp): RPG Skyline Diffusor (http://www.rpginc.com/products/skyline/index.htm): Here you can see it on the back of a listening wall: RPG Qrd Diffusor (http://www.rpginc.com/products/diffractal/index.htm): Here is a home-built. I am thinking about doing this myself, on the entire back wall. What makes any one of these better than the others? Which would you stay away from? Thanks for any help.