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Message: <blockquote data-quote="jmanpc" data-source="post: 3112539" data-attributes="member: 565915">It looks like I'm gonna get an HD3 15", and I want to put up some nasty numbers with it... I want to make a giant port on that sucker.... I usually use 15 sq. in. of port per cubic foot, but how much is too much? Will an oversized port adversely affect my SPL?I man, I could make a box that has 128 sq. in. of port for 4.5 cubes. Or I could stick with the formula and give it 70 or so...</blockquote>

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