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Audio and Video Talk
Acoustics & Room Treatment
Limp mass membrane for bass traps
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<blockquote data-quote="Timber_MG" data-source="post: 219306" data-attributes="member: 18"><p>I believe that the figure of merit for resistive damping is rayls/m if you can get the spec for that for your material. There is an optimum somewhere (I believe it's 703 fiberglass)</p><p></p><p>The material furthest away from the wall will have the most effect at low frequencies. The absorption works by damping velocity, a wave has no velocity at a solid room boundary and the longer the wavelength the further from the wall boundary you need to be before there is velocity to resitively damp). </p><p></p><p>That is why an air space behind an absorber decreases the lowest effective frequency.</p><p></p><p>In a room the modes couple well to the corners and it is least obtrusive to place a bass trap there generally. If you don't need to absorb high frequencies the LF is generally a better place to start treating (That's the region below the Shroeder frequency)</p></blockquote><p></p>
[QUOTE="Timber_MG, post: 219306, member: 18"] I believe that the figure of merit for resistive damping is rayls/m if you can get the spec for that for your material. There is an optimum somewhere (I believe it's 703 fiberglass) The material furthest away from the wall will have the most effect at low frequencies. The absorption works by damping velocity, a wave has no velocity at a solid room boundary and the longer the wavelength the further from the wall boundary you need to be before there is velocity to resitively damp). That is why an air space behind an absorber decreases the lowest effective frequency. In a room the modes couple well to the corners and it is least obtrusive to place a bass trap there generally. If you don't need to absorb high frequencies the LF is generally a better place to start treating (That's the region below the Shroeder frequency) [/QUOTE]
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Audio and Video Talk
Acoustics & Room Treatment
Limp mass membrane for bass traps
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