Need help designing a box for TWO Fi BL 15's

[teenagebasshead]

So I have my measurements : Height=23; Depth=18; Width=46 , wood is going to be 1.5in thick

I want it ported & tuned to 34hz

I googled box calculator and I used like 3-4 different ones at the same time and they all gave me different tuning frequencies or port length, etc.

I would really appreciate any and all help

This is going in the back of a 1997 GMC Suburban with two Fi Bl 15's powered by two Crescendo Audio BC2000D

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[ObTechAudio]

Man I really cant see those dimensions working. I feel like the box is just going to be too small for those subs to get as rowdy as they should be. Do you have anymore depth you can give this box?