As good as any other material including the more expensive foam products is very inexpensive Owens Corning #703 1in fiberglass panels that can be covered with most any fabric from $2.99 yd burlap to $25 speaker cloth to anything in between from the RAG Shop and be hung on the wall like a picture. Best to leave an air space between #703 fiberglass panel and wall. Can even make low and high bass trap absorbers that absorb from the 60hz to 300 range for only 40 a trap which will be much better than the expensive round common tube traps from the famous manufactures. The foam mentioned also works but cost more and is more diffulcult to cover. Try this link for plans ------ Build a Better Bass TrapAddress:http://www.ethanwiner.com/basstrap.html
