I used Ready Acoustics ones with good results; pictured on my virtual system page. So attractive that my wife, who has no interest in audio, had me buy some more for the HT room.
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I did much research a few years ago on room treatments as well as trying many absorbers, defusers etc. Eventually I decided to hire a company that specializes in room analysis to shoot the room. The first thing they did was to shoot the room, then remove all the absorbers I had placed and run there program again, it turned out the room was better with no room tunes than the ones I had placed, I would still argue that, but there analysis doesn't lie. In the end, after much trial an error they ended up using one small absorber in the middle of the rear wall, two small first reflection absorbers on the side walls and one very large bass absorber in the rear corner.
One thing they told me that I have since found to be true, was that a bass absorber should be two to three feet thick to be affective. The one they used very affectively here was a 2' cube made by ASC.
I had a Rives Level II done. You can buy absorbers, diffusors and combos. You can also build a lot of this yourself. There is probably something to the thick bass absorber that Tmsorosk references. Mine are designed to absorb below a certain frequency. They are custom made corner absorbers that consist of pond liner that sound passes through and is absorbed by different types of fiber glass. The absorber is about 2 1/2' on each side and goes from floor to ceiling which is 9'. These are behind the speakers and there are different corner absorbers in the back of the room.
It will be interesting to see what the comparison reveals. Especially when one looks at the construction differences. Right now I'm talking with Primacoustics and GIK. Now, I'm no carpenter ( growing up my Father's motto was cut THEN measure) but I'm tempted to build my own and have a local upholsterer complete the outer fabric.