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Message: <blockquote data-quote="pavengmike6" data-source="post: 389550" data-attributes="member: 553009">I agree with the taking the poly fill out.  It does trick the sub into thinking there is more VAC than is really there.  On more thing and this you may have already checked.  Check to make sure they are all in phase.  You will be suprised (if you have done this before) how out of phase subs can sound muffled.  Trash the poly and hook each sub up one at a time and make sure about the phase problem.As for the board on top that should only enhance the loading of the subs.  Seeing you are getting (or want to get) the sound created by the sub in the box, you are front loading the sub and making it push harder (which is not always a bad thing) to hit the notes.  This will produce a hard hitting bass if done right.</blockquote>

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