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I read that when upgrading speakers they should be backed with polyfil ??? Does anyone know what this is ?
What does it do and where can I get some ? Can is use foam rubber ? Any help would be appreciated.
 

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It's cheap pillow stuffing. Any craft place like Michaels or JoAnns will have it.

Walmart has it as well I believe.


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rolled polyfil from walmart. 7 bucks for a ton of it
 
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