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I know this is a somewhat old thread but I did find it Googling "cheap acoustically-transparent fabric."
I'm almost certain this last post (directly above) is misinformation, the sound has to be able to pass THROUGH the cloth in order for the acoustic panel to do its work of bouncing the sound around inside its air cells and actually converting it to heat which is how it absorbs the sound energy.
Acoustically-reflective cloth WILL reflect sound, at least the higher and perhaps even the lower frequencies.
Most of you know this, stick with the earlier posts, not the one directly above!
The sound has to PASS THROUGH the cloth so it can be dealt with INSIDE the panel material. Any cloth you can easily breathe through should work at least as far as that is concerned (of course the durability and FLAME RESISTANCE are important too!!!) great suggestion on the double-knit above, thanks!!!
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