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Acoustic transparency is for speaker grilles, where the sound's on one side and you're on the other. The problem with ordinary fabrics is they absorb high frequencies that you want to pass through.
But what's not passed through is absorbed, not reflected, so any fabric will do for covering acoustic absorbtion material on the walls. You'd have to have some incredibly hard sort of material like thick leather before you had a problem with that.
I've got carpet over my bass traps! I'm sure it doesn't impair their performance.
(its actually a cut up rug that was surplus to requirements, and it has quite an open weave)
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