| why fiberglass panels absorb lower frequencies than they theoritically should?
In theory to absorb a wave we need a porous absorber that is 1/4 wave length deep. Why fiberglass panels absorb lower frequencies? My panel is 8" deep (6" fiberglass spaced 2" from the wall). It should absorb frequencies down to 425Hz (8" is 1/4 of a 425Hz wave length) but in fact it is very effective down to 60Hz and still effective at 50Hz. Could someone point me to some documents where it is explained?
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