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Hi:

I've read posts here (around 2010) that adding damping material can help a subwoofer cabinet appear larger internally by adding something like one pound of fill per one cubic foot being the measure. My cabinet, exclusive of bracing and driver is about 3.4^ feet.

I am thinking about inserting some polyester pillow stuffing on hand. To avoid stuffing floating around, I'm thinking of placing the polyester inside an old cotton shirt or some other porous fabric to limit its migration inside the subwoofer. The stuffing will not be compressed so much as "contained" by the fabric. If the fabric is not a tight weave, should that be "ok" acoustically?

Any thoughts or warnings on that?

In advance, thanks.
 

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Using loose-fill is actually quite forgiving, so I suspect you'll be ok with what you're attempting to do.
 
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