help with box design?

[carter1010 10+ year member]

I have two DD1508 subs I would like to put in my car in a ported box. The max width i have is 34", max hight is 15" depth is ? but would like it is shallow as possible. Looking to build as close to DD specs as possible. Can anyone help me design a box for this? Cut sheets ext. I have bass box pro but am obviously doing something wrong as my FS always comes out around 60 hz and my cut sheet shows only the main box and not the pieces for the port.

Thank you!

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