tuning help please!

[spenman47 10+ year member]

i have a box for dual 15" subs. its 8.75 cf and i am using 3" aeros and i will be using 4 of them across the top. can anyone please tell me what lengths to cut the to tune it to 32 hertz.

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[DBBOOM 10+ year member]

http://www.carstereo.com, how to section has a port and tuning calculator.

Came up with 6.31''