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Another Acoustic nightmare solved with DML speakers. 
Sand vs Carbon?
1
Just wondering if sand has been tested and compared to carbon in a diaphragmatic absorber
? Or another similar medium?
Thanks
?
2
That is a very interesting question. My brother was in construction and I remember him saying that he put sand in the walls on a project for sound management. Not sure how many inches wide they used. The sand is more dense for sure, but it would have a lower surface area (not porous) to absorb sound waves compared to the carbon pellets Dennis uses.
3
Sand is not a sound absorption technology. It can be used as a barrier technology.
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