Quote Originally Posted by DarkCide View Post
Does the fabric back of the sound absorption panel also need to be breathable like the front?
Without getting into some of the more specialized types of traps that have membranes or very specific uses...the simple answer is yes, use a breathable cloth on both sides.
Sometimes when traps are going to hung on a wall with only a 2"-4" gape from the wall (or ceiling)...people don't bother putting any cloth on the back (even some ready-made traps come like that)...but if you are going to see the back, or you want more flexibility in that you can move the traps around...for esoteric reasons, you would want to wrap both sides.