new box for 2 18 treo ssx

[hllywood29 10+ year member]

i need help designing a box with 12 cubic ft internal and a 180 inch square port.

lenght of the port would be 17.25 inches.box dimensions would be 48 inches wide

and 261/4 inches deep and 24 inches high.it will be going in a 2003 chevy tahoe.

i would like the subs to face up and port back.i have included picture of the box

like i want except i just want a square port in the center instead of the six sided port in the pick.treo told me t would be tuned to about 38 hz.any help wil be appreciated.thanks

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