Need box design help please for hdc3 18

[1mounty]

I have a soundqubed hdc3.1 18 and need help on a box design. I'm helping a friend build a box and he listens to rap and will be running it off a cab1600.1. The space to fit it in is 35x37 and 15 1/2 tall and wants it ported. Thanks any suggestions will be greatly appreciated!!

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[1mounty]

I have a box design from a website and I'm not sure if I should trust it. if anyone could tell me if re audio box calculator is good id be greatly appreciated but here are the specs it gave me. box bottom plate: 35x35 box top plate: 35x35 box left plate: 34.25 x 13.5 x 34.25 x 13.5 box right plate: 33.5 x 13.5 x 33.5 x 13.5 box front plate: 27.25 x 13.5 port L1:26.5 x 13.5 x 26.5 x 13.5 and said its tuned to 28hz.