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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.
You may think this idea is silly but try it before you dismiss it.Take the fabric in question and wrap about 10 layers of it around your face. If it prevents you from breathing clearly the material is too dense. You may notice that some of the customers in the store begin to stair - ignore them, move on and try another.
Great idea, but what if the fabric I've chosen isn't transparent enough, what happens to me :-) I'm gonna go try this now (with burlap FIRST).
I also thought of using a light meter, but the fabic is probably transluscent enough that the reading would measure more than what went through the holes.
I'd rather use an spl meter! But if you were to set up the jig for the measurement (signal generator, amplifier, speaker, spl meter etc etc) in a cloth shop, you may have to lease out the shop for half-a-day or something.. A better idea would be to take samples of prospective merchandise and give it a try by covering the tweater of your hifi with it, one at a time. Hope you get the point. It is the high frequency attenuation that is most prominent.Tweaker
Covering a speaker was my next guess. I presume I need to measure for attenuation both on and off-axis and at several frequencies? Since I don't have an oscillator, I can't do a freq. sweep. Thanks for the suggestions, I'll try it.
I've got a small swatch of the Guilford fabric ASC uses. Acoustics First uses the same stuff.I'd try to buy the Guilford if you can find it... It's apparently made and optimized for it's acoustic properties.
If you'd like I can mail you a 2" swatch...
Thanks for the kind offfer. I too have a swatch book of the guilford fabrics and will probably use some of it for some of my J. Risch DIY absorbers. The only drawback to the guilford fabric is that it's $20.00 per yard and it takes 2 yards to cover each panel. The stuff I found was $4.00 per yard. If I find that it's transparent enough, I'll put up a picture of it and try to find out who made it. Unfortunately, I bought the last two yards the store had.What I was hoping to do was to mix fabrics (guilford,burlap and this stuff) for a more decorative look as opposed to a bunch of panels all the same color and fabric.
BTW for those of you looking for the Guilford Fabric, I found it at a place in Virginia called Acoustic Solutions (http://www.acousticalsolutions.com). They mailed me a swatch book as well as a samlpe of a pre-made panel which they sell. It appears that they will sell the fabric by the yard.
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