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Message: <blockquote data-quote="keep_hope_alive" data-source="post: 7908506" data-attributes="member: 576029">you can change tuning by changing the density of the material in the aperiodic vents.  the vents should be roughly the same size (or one step smaller) than the woofers, and consist of two grills (one out and one in).  in the middle of these grills should be fiberglass batt or mineral fiber or denim insulation.  you change "tuning" by stuffing more material between the grills (keeping it evenly distributed but increasing density).note that this design is the least efficient method of coupling the woofer to the membrane, but the most common.I ran the same thing before, with a Type-R 12" (not intended for the application) and it worked well.</blockquote>

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