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Message: <blockquote data-quote="powersupply" data-source="post: 744235" data-attributes="member: 556380"><p>adding poyfill will not make it louder, some say it cleans up muddy sounding bass, but I dont notice much of a difference.  You can not usually just port a sealed box, it has to be designed for your subs, unless you made your sealed box to that size anyway.  Check what size you need for your subs for a ported box from the manufacturer and go from there.  Good luck</p></blockquote><p></p>

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