I would not use fiber glass (sorry Wayne) because it does not last. And is not healthy. I would look under the names of "SoundProofing and Acoustic Materials" and other industrial type materials for construction, etc. with the same properties (is only my opinion). I like to open a speaker after 20 years and find the material intact, not like dust in the bottom. A good material similar in texture to figer glass is the white snow that goes in the upholstery of sofas (and pillows - home use) and you can find it in any supermaket or similar department store.
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