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<blockquote data-quote="Trixter" data-source="post: 1620943" data-attributes="member: 542668">ok...i didn&#039;t know that the front had an over hang...then yeah 10.25 + .75.the only part that will be considered extra displacement is the piece that is currently in the box, the messed up piece. it would be the same as if you built the box correctly and simply added another piece inside the box. .06cu&#039; will not make a difference. add the piece to the inner port wall and you will be all good.just as fyi....the port&#039;s volume is accounted for in terms of displacement, just like the sub. if your sub takes up .5cu&#039; and your port .4cu&#039; and the sub calls for 3cu&#039; box then you need to make a box that is 3.9cu&#039; total.to figure out port displacement...-the length of the port minus the front baffle (front already accounted for because you measure the inside of the box. usually the front baffle is an added .75&quot; of port length which will not be counted.)-the inner heigth-the port width + the thickness of the inner port wall(s) (usually .75)multiply these together and divide by 1728 to get the port&#039;s displacement.</blockquote>

[QUOTE="Trixter, post: 1620943, member: 542668"] ok...i didn't know that the front had an over hang...then yeah 10.25 + .75. the only part that will be considered extra displacement is the piece that is currently in the box, the messed up piece. it would be the same as if you built the box correctly and simply added another piece inside the box. .06cu' will not make a difference. add the piece to the inner port wall and you will be all good. just as fyi.... the port's volume is accounted for in terms of displacement, just like the sub. if your sub takes up .5cu' and your port .4cu' and the sub calls for 3cu' box then you need to make a box that is 3.9cu' total. to figure out port displacement... -the length of the port minus the front baffle (front already accounted for because you measure the inside of the box. usually the front baffle is an added .75" of port length which will not be counted.) -the inner heigth -the port width + the thickness of the inner port wall(s) (usually .75) multiply these together and divide by 1728 to get the port's displacement. [/QUOTE]

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