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Originally Posted by tINY
About 2-3" is all you need, but you have to space it out from the wall to get bass absorbtion (part of the reason corner traps work).
You may not want to kill all the higher frequencies in the room either.
Making a structure with stantions (like 2x8s) and a panel of pegboard to mount the mineral fiber to can be just the thing.
-tINY
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You really do not want to mount onto anything.. Keeping the back open is a must.. Even for the first reflection point panels... If you make them 2" thick you want to space them off the wall 2".. It not only picks up more of the low end but also picks up more of the high end..
Glenn