98 Deville

[mrlandry409 10+ year member]

I have a 7cube box for 2 15'' type r's. I want to tune to 32-35hz and use 4'' round ports(pvc). How long should they be. Ive searched and searched all the online calculators. This one looked wrong so I decided to ask the pros!!

http://www.carstereo.com/help2/Articles.cfm?id=31

Any help will be apreciated.

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[MemphisCherokee 10+ year member]

12 of them, 8 feet long each