venting calculations

[slicks5150 10+ year member]

need some help venting my atlas12 anyone know what the specs are? i checked their site but nothing there on venting (what is the cut out size?) for the sub I think I will try to make the box around 3cubes( although I have been told to go bigger)( but space may be an issue I have a 94 corsica)and tune it to 30hz but I need some dimensions for this application where can I find calculations on venting to 30hz on a 3^3 enclosure?

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