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A comment on An “acoustic metamaterial” that can cancel 94 percent of sound. Parent comment

Re:An “acoustic metamaterial” that can cancel 94 percent of ... by vonseel on Saturday March 09, 2019 @05:03PM (#19348790)
In what world is anyone using PVC to make bass traps? Every advice I have seen uses rockwool or something like Owens Corning 703/705. I am assuming you are not referring to the structure used to contain the acoustic material.
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