It is generally recommended to use 1 pound per cu ft. This combination is equivelent to a 12 to 15% increase in enclosure volume.
I have use it before and it does work but I found it works best with small sub drivers. I think it helps reduce port noise in vented enclosures.
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To the optimist, the glass is half full. To the pessimist, the glass is half empty. To the engineer, the glass is twice as big as it needs to be.
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