I bought 24" wide insulation at Home Depot, the type covered in a translucent pick plastic with a white fiberglass fill, some 1/4" luan, and some reasonably transparent fabric that matched my room. I cut the 4'x8' luan into 2'x4' sheets, stapled the insulation to the luan at the edges, and covered with fabric. These panels are both reflective and absorbtive. I've placed them at key reflection points and behind my listening position. The result has been quite dramatic, although I am still curious what a well done commercial solution would sound like.
Room Treatment
We have all talked about the best amp, best pre-amp and the best audio components to buy at a certain price. I would like to find out what material is the best room treatment available. Is is a hard material like a styrofoam product or an absobtive product like rubber or sponge? What has worked for you and why? Do you use fabric to hide these treatments or have you found something better? Room treatment has very little discussion. I would like to find a DIY project that can improve the overall dynamics of a very difficult room. Let me hear your comments.....