How to measure the acoutstic transparency of fabric

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I was browsing in a fabfic store the other day and found on the remnant table a piece of fabric which looks like it may be great for covering acoustic panels. It's a thin cotton woven fabric that looks like a thin version of what long underware are made AND it comes in colors.
I tried holding a piece over the mike of my SPL meter while playing several test freqencies but the SPL meter couldn't tell the difference in attenuation between the test fabric and a towel (!). I must be doing something wrong.
FWIW I can see light through the fabric about as well as I can through a piece of decorator burlap. I want to use this stuff, but need to be sure that it is acoustically as transparent as the decorator burlap. I don't think reflectance will be much of an issue since the fibers are cotton. All suggestions would be appreciated.

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Topic - How to measure the acoutstic transparency of fabric - Batman 14:26:32 06/21/00 (6)

Re: How to measure the acoutstic transparency of fabric - Thomas Jordan 14:40:54 06/21/00 (5)

But? - Batman 17:11:09 06/21/00 (2)

Re: But? - tweaker 23:07:29 06/21/00 (1)

I thought so - Batman 06:55:58 06/22/00 (0)

Re: How to measure the acoustic transparency of fabric - Rob Thomas 15:32:58 06/21/00 (1)

Thanks - Batman 17:08:12 06/21/00 (0)

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