Port Freq. question

[DDSC 10+ year member]

How do you figure out what the port freq is, like if i build a 4 cube box with a port that 3.5 inches wide and 15 inches long. what would that be tuned to. I built my first box a few weeks ago and a couple people at work want me to build them boxes but their cars trunks, subs ect. are all diffrent sizes so i need to know how to figure out how to get a desired tuning out of boxes that are diffrent sizes

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[type[s5] 10+ year member]

http://www.diysubwoofers.org/prt/

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[Trixter 10+ year member]

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