Port length?

[Synyster97XLT 10+ year member]

Well, I have a 8.0ft^3 box drawn up, with the port area being 2.5"x40.5". How long does my port need to be for my box to be @33hz? I can't find a calculator anywhere.

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[csu87 10+ year member]

the12volt.com or carstereo.com both have calculators

 

[Synyster97XLT 10+ year member]

Oh thanks. I tried to do an equation that I found on the internet for port length, but I got like 995 inches for length. That's when I knew I had better use a calculator.