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Message: <blockquote data-quote="RAM_Designs" data-source="post: 7143045" data-attributes="member: 566575">We don't know any specs about his box besides that it's tuned to 33hz, so it's kinda hard to make suggestions as far as what box size to use and if he's using enough port area.  The size of the peak depends on the sub/box combo, and how it reacts with the cabin of the vehicle.  Also, the peak won't be at the tuning frequency, but a few hz above it, and gradually taper off in each direction(then quickly falling off below tuning frequency).  I had three 18's tuned to 32hz and still peaked at 57hz on the meter because that's where my truck peaks at.I think he's just used to a sealed box and how the upper frequencies are more dominant than in a relatively low tuned ported box where the lower notes are generally more present than in a sealed box.</blockquote>

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