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<blockquote data-quote="Art Welter" data-source="post: 218751" data-attributes="member: 52">I don&#039;t really know. Ultimately you are trying to turn sound energy into heat, and the movement of the sound absorber walls can contribute to that, so depending on the design, the cylinder, being stiffer per material thickness may be less effective.No, and I&#039;m not sure that a strict Helmholtz based approach is best for anything other than a fairly narrow band (high Q) frequency absorption, which is unlikely in your case.As GIK Acoustics (maker of the TurboTrap Pro) puts it: &quot;The ways in which density affects performance of absorption materials is counterintuitive. After long development and testing, we found the optimal combination of two very specific material densities, arranged in specific ways, offering more effective deep bass absorption than single-density materials used in most conventional bass traps. &quot;You might try a better exhaust muffler rather&nbsp; than trying to externally reduce the low frequency noise.</blockquote>

[QUOTE="Art Welter, post: 218751, member: 52"] I don't really know. Ultimately you are trying to turn sound energy into heat, and the movement of the sound absorber walls can contribute to that, so depending on the design, the cylinder, being stiffer per material thickness may be less effective. No, and I'm not sure that a strict Helmholtz based approach is best for anything other than a fairly narrow band (high Q) frequency absorption, which is unlikely in your case. As GIK Acoustics (maker of the TurboTrap Pro) puts it: "The ways in which density affects performance of absorption materials is counterintuitive. After long development and testing, we found the optimal combination of two very specific material densities, arranged in specific ways, offering more effective deep bass absorption than single-density materials used in most conventional bass traps. " You might try a better exhaust muffler rather than trying to externally reduce the low frequency noise. [/QUOTE]

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