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Message: <blockquote data-quote="bbeljefe" data-source="post: 8264147" data-attributes="member: 655960">Everything in enclosure design is based off net internal volume (after ALL displacements), with the exception of finding out how much room you have for a box. So, once you know how much room you have to work with, that's the last time you worry about gross volume.And as was mentioned, using "port area per cube" is about as scientific as predicting the weather with a horoscope. Port area is calculated using the amount of air the sub(s) displaces (xmax) and the desired tuning frequency. For higher tuning, you'll need more port area than for low tuning and when you use aero ports, you still need a close approximation of the calculated port area. Fifteen to 20% as mentioned above is the most I would reduce port area.</blockquote>

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