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Message: <blockquote data-quote="Cruzer" data-source="post: 7225001" data-attributes="member: 617686">Slot port area range is based on 12-16 square inches of port per cubic foot, while aero ports are based on 9-13square inches per cubic foot.thats copy and pasted from a ported box calculator program. not sure if its accurate or not.im with thumper, they recommend 3.75, unless ur under powering it considerably, u wont need a 5 cubic foot box. and if ur using 3500, which is 1500 over the rated watts, u probably shouldnt exceed the 3.75, and should probably aim a little under that to increase power handling</blockquote>

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