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"Does anybody know how this would do at around 50-125hz, or is this membrane-trap territory? Or do you guys think 6" 703 might be overkill?"
No way to know until you test it in a sound lab.. 6" is not over kill at all, but look over the cost. Our panel is tested at 2.02 Absorption Coefficients at 80Hz when straddling corners and those are 4" thick. But ours are not just fiberglass so not sure what making them yourself will get you at 80Hz.. I am not trying to sell you our stuff but if you are having problems in that area you might be better off buying instead of building.. If you would like, PM me and I can send you testing data for you to look over.
Glenn
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