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If by "panel absorber" you mean a slab of rigid fiberglass, then No, a frame is not needed except to help mounting.
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Is the 4" slab I described not a panel absorber ?
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(But which video? I've done several.)
--Ethan
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I only saw one video, a while back of you playing a bunch of cellos. I will have to check your site out again to view the other videos.
Thanks for your help, by the way.