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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 David Aiken on February 06, 2008 at 14:04:06
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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