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Message: <blockquote data-quote="morespl" data-source="post: 7323248" data-attributes="member: 613774"><p>for a fifteen you need more port than box tc 5200 have a flat responce at 30-32 hertz, I seen people run 100 sq/in of port for sub at three cubes you would need 80 something inches of port In other words a 3 cubed box with 3.5 cubes of port for a 15 if you use the correct port you will need roughly 23.5 cubes per 3 subs you would probably gain more running 2 in a little smaller box In that box design single layer thick your gross internal dimensions are 17.39 cubes your 5 cubes short for three I would run 2</p></blockquote><p></p>

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