Hey Timm,
I have several of these in my two channel room. Four of them are the 4" thick version and the rest are the 2" version; all of the sizes are 24"x48". They can make custom sizes as well, but the price goes up quite a bit. The quality is very good and they use the same independent testing facility as some of the more expensive ones if I'm not mistaken. You can go to their site and see which frequencies will be absorbed and get an idea of whether you need 2" or 4". If you click on the link to my system you can see them hanging on the wall on the first page. That is my updated system pictures with some new gear and the ATS acoustic panels. They have really made a difference in the way my system sounds and was well worth the price. The two you will see in the corners are the 4" thick bass traps without the board on the back, and the two directly behind the Vantages are also 4" thick. I looked around alot before purchasing these and while there other companies that do a good job, none were as affordable as these. There price and workmanship are superb!:rocker:
Glen
P.S.
I did not order all of these at the same time, but rather ordered a few here and there. I wanted to treat the front part of the room first so that was my first goal. Then the side wall first reflections, and lastly the back part. This helped me spread out the cost while benefitting from each installment.