Quote:
Originally Posted by bigaudiofanat
...There are other salutions such as foam which absorb sound much better than sound mat...
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Just to be clear, foams generally make very poor acoustic barriers as they lack a key property: mass.
Closed cell foam (used as it won't absorb fluids) is used mainly as a decoupler layer between the dampener and the stuff that actually exhibits the physical properties necessary to knock down sound waves: mass loaded vinyl.
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