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Return to Room Acoustics Forum by Rives Audio
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In Reply to: RE: DIY acoustic panels questions posted by temporarymadness@aol.com on February 05, 2008 at 21:17:50
If I was going to use faced fibreglass and the facing was strong enough to handle the compression applied by a covering stretched tight, I would try the faced fiberglass with the paper tacked to the back of the frame and no plastic at all. A covering of polyester over the paper would be a reasonable safety precaution in case the paper splits at some stage and exposes fibreglass. I do think you need polyester over the front of the fibreglass.
I would only use polyester with unfaced fibreglass, and I would make sure that no fibres could escape between the plastic backing and the frame by both gluing and stapling the plastic down. You could then omit the polyester layer between the burlap and the plastic at the back of the panel but I would probably prefer to have some polyester there for HF to mid frequency absorption on that side also, otherwise the back of the panel will be reflective from mid frequencies on up.
David Aiken
in your second example, why does it matter if the back of the panel is reflective?
-chris
You get more absorption with the panel spaced off the wall and one of the reasons for that is that you expose a second surface for absorption. If you make it reflective, you lose some absorption efficiency at those frequencies where the rear surface is reflective.
Of course, if you only want the amount of absorption you get from the front of the panel it won't matter as far as absorption goes but the reflectivity at high frequencies coupled with the fact that it will still absorb at lower frequencies may create a problem with the tonal balance of the reflected sound field. Note that I said "may create", not will create, since that HF reflectivity has to be considered in the context of the overall reflectivity/absorption spectrum of your room.
David Aiken
assuming i went with the unfaced fiberglass, would you still recommend using spray adhesive (sticking fiberglass to plastic) in order to keep the fiberglass from sagging over time?
-chris
Yes, but not only to keep it from sagging. When I made my first pair of panels using polyester batts, I didn't glue them to the plastic. When I made the second pair, I did. My feeling was that I got better performance at low frequencies from the second pair. That's a judgement based on what I heard since I have no way of doing measurements.
David Aiken
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