Need Help With Box For Suv

[jmitch]

Im goin to put 4 BTL 15s in my suv and i can t seem to figure out how figure out how to build the box with the right specs and and port size. Can sum1 point me into the right direction.

Thanks

[Guest]

you would need at least 12ft² ported for it to work, says its 3ft² per sub minimum