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Glenn,
> Broad band is just a term for a bass trap that also picks up HF. <
Yes, that's the right answer. Though broadband can also mean a bass trap that's not tuned, the way wood panel traps and Helmholtz absorbers are tuned. As for the original poster's question, I'd avoid taping over the edges or hardening them with epoxy as is sometimes done. As Joel pointed out, once you block the porous openings the panels absorb less.
--Ethan
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