how much

[Jimmyd_442 10+ year member]

I'm trying to build a box for a 15'' type R dual 4 ohm voice coil. Does anybody know how much cubic feet I should use? The alpine website only has it for a sealed box. From what I understand it doesn't really matter because when you tune your port for length it is just going to be longer wider or shorter ext. ??? what do you people think

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[Alpine2005 10+ year member]

sealed box volume: 1.3-2.5 cubic feet

ported box volume: 1.5-3.0 cubic feet