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Originally Posted by DarkEcho  with a 4" backer frame, the traps back would be flush with the wall but would space the trap 4" off the wall. Is it a problem that the wood is touching the wall all the way around? |
So your going to make a 8" frame and put 4" rigid fiberglass inside but spaced 4" from the wall? It would work that way but keep in mind that sound also comes in from the sides which pick up sound also.
Glenn