Sound Absorbing Material

Two more to look at are acousticalsolutions.com and echobusters.com. HiFiFarm.com also carries sound absorbing products including audio carpet (which I know nothing about, but the idea is appealing). One of the most impressive high end shops I've seen used a collection of very high quality/expensive Persian rugs on the walls which was absolutely stunning (though probably not as effective as products designed for the purpose).

I too would second The F. Alton Everest books that Tom mentioned.

Keep in mind that most "absorbers" are not linear in their frequency response. As such, it is VERY easy to end up with a system that sounds dull and flat due to a lack of high frequency energy whereas nothing was done to absorb / level out the low frequency output. Rather than guessing or paying someone else to build products to solve your problems, read up on the subject, do it right the first time by doing it yourself and save your money along the way. Sean
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Stuffed furniture, with cheap great-looking, thick pillows found at Marshalls, etc. Plop 'em up to absorb sidewall splatter; knock 'em down for instant WAF! Ern

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

Two more are fiberglass and Sonex. audioadvisor carries sonex. You can use fiberglass to build your own.