Help with port area

[BassHead99 10+ year member]

I'm going to try and build a ported box for my 2 12" L7s. I want it to be tuned around ~32hz. My dimensions are 47*19*15 which is about 8 cu ft before port area. I'm just going to do a basic square box design but can someone come up with the port dimensions for me? Thanks

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