The following paragraph sure sounds to me as if polyester is the suggested fabric for acoustical treatments:
Once the fiberglass is attached to the wall, you can build a wooden frame covered with fabric and place the frame over the fiberglass for appearance. If that's too much work, you can cut pieces of fabric and staple them to the edges of the wood strips. Nearly any porous fabric is appropriate, and one popular brand is Guilford type FR701. Unfortunately, it's very expensive. One key feature of FR701 is that it's made of polyester so it won't shrink or loosen with changes in humidity when stretched on a frame. But polyester is a common material available in many styles and patterns at any local fabric store. Another feature of FR701 is that it's one of the few commercial fabrics rated to be acoustically transparent. But since you're not using it as speaker grill cloth to place in front of a tweeter, that feature too is not necessary.
Registered: 06/12/00
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Loc: New Milford, CT, USA
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Dan,
Sorry, my fault entirely. I'm not much of a fabric guy, and I forgot which synthetic was which. I don't know what to tell you other than to go to a fabric store and find literally anything that's not shiny and/or dense.
--Ethan
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