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Message: <blockquote data-quote="pwr2max" data-source="post: 511515" data-attributes="member: 545489"><p>Well the formula for volume is the surface area of the base times the depth of the tube. So basically take the inner diameter of the tube, divide that by 2 to get the radius. Then square that number and multiply it by pie. (in other words pie * r^2, where r equals the radius or one half of the inner diameter of the tube) And for the sake of 1 cu ft, divide 1 by what ever number you get from before to get the depth. The inner diameter of ur tube should be at least your cutout/mounting diameter for the sub.</p></blockquote><p></p>

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