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<blockquote data-quote="Robert Wooden" data-source="post: 218750" data-attributes="member: 17251">Thank you Art Welter. Your post was very informative.Thanks for the Sonotube suggestion. That&#039;s a great idea. I invision Sonotube with MDF end caps adhered onto each end then the duct in the center of one of the ends. Then, poops into my head what about PVC for smaller diameter chambers? The smallest Sonotubes are 6&quot; in diameter. PVC I have found as large as 12&quot; diameter. For budget sake most home centers offer PVC up to 4&quot; dia. in short lengths and I have seen (personally) Sonotube are 4 foot lengths in home centers.I am looking to absorb frequencies below 250 Hz or so. With your suggestion of Sonotube, are you thinking that a round chamber shape may be slightly better performance than a square or rectangle chamber? I know I can absorb higher frequencies (250+ Hz) with an acoustic mineral wool insulation that is going to line the inside of my small (4 ft. x 4 ft. x 4 ft.) building that surrounds the generator.Any thoughts on how to calculate the space displaced inside a chamber by the sound absorption material?</blockquote>

[QUOTE="Robert Wooden, post: 218750, member: 17251"] Thank you Art Welter. Your post was very informative. Thanks for the Sonotube suggestion. That's a great idea. I invision Sonotube with MDF end caps adhered onto each end then the duct in the center of one of the ends. Then, poops into my head what about PVC for smaller diameter chambers? The smallest Sonotubes are 6" in diameter. PVC I have found as large as 12" diameter. For budget sake most home centers offer PVC up to 4" dia. in short lengths and I have seen (personally) Sonotube are 4 foot lengths in home centers. I am looking to absorb frequencies below 250 Hz or so. With your suggestion of Sonotube, are you thinking that a round chamber shape may be slightly better performance than a square or rectangle chamber? I know I can absorb higher frequencies (250+ Hz) with an acoustic mineral wool insulation that is going to line the inside of my small (4 ft. x 4 ft. x 4 ft.) building that surrounds the generator. Any thoughts on how to calculate the space displaced inside a chamber by the sound absorption material? [/QUOTE]

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