need specs for DD9512

[Cas 10+ year member]

wanna hit harder...i would like the box to be tuned to play at 40-42hertz....anyone can recommend me some specs?

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[KnOkIn It 420 10+ year member]

My best findings were 4.5 cubes 3areo ports tuned to 42hz.

 

[Papermaker85 5,000+ posts]

what car you have? what size/tune box you have? how much power you have? placement and direction are the sub/ports?