Need help to design 3.5cu ft3 slotted enclosure tuned at 32Hz

[Chov1ch]

As tittle say i need help design 3.5cu ft3 slotted enclosure tuned at 32hz for my two infinity kappa perfect 12.1 subwoofers. Thanks

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[Papermaker85 5,000+ posts]

Centered port subs centered between the ports on each side of the port. no real bracing required for this type on design.

 

[Chov1ch]

But how can i calculate tune frequency on slot port?

Design like this?

http://i.imgur.com/U5DwGE8.png