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9-15 cu feet is what you need for a ported box. Sealed it's 5.4-15.6 cu feet.
those numbers give you 16cft external, inside comes to 13.6cft before sub and port displacement, whats the height and length of that port
i was meaning the length of the port inside the box
something doesnt sound right about that, your box alone has a depth of 24" correct and your port height is 3" correct?