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Message: <blockquote data-quote="tommyk90" data-source="post: 336246" data-attributes="member: 545293"><p>You only reverse the polarity when you invert the subs.</p><p></p><p></p><p>My truck does the same thing, i think it has to do with the airspace inside the cabin itself.  To help with this i ported my box(listed below).  It increased the output but it's still much louder when i open the door, so i'm really not sure.</p></blockquote><p></p>

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