need help with a box for 2 JBLs

[MemphisCherokee 10+ year member]

a budy of mine needs a box for 2 jbl P1224s

we want to port to 37 and its going in a grand prix

really, all i need is a suggestion on how much room im gonna need airspace wise and port area

airspace wise, subwoofer tools said 10.5 f^3

and i was like

WTF?

t/s parameters: http://manuals.harman.com/JBL/CAR/Boxes%20and%20Parameters/P1224rev3_27_06.pdf

also, are there any equations or tricks for calculating port area?

its gonna be a slot port and i may or may not flare it

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[MemphisCherokee 10+ year member]

not cool