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If you can, do not use a backing board for sound panels. Per the research material I referenced, if you mount a 2" thick panel approx. 2" off the wall, the panels can accomplish double absorption (knock down waves, some pass thru, bounce off wall & pass thru again). Also if you use a perimeter wood frame, you are reducing the total panel area absorption by blocking off the sides. Of course from a finished product & mounting standpoint, it becomes more challenging without backing boards or frames. Even if they end up looking a little unfinished, they are still doing the job, only better.
