port length

[rain377 10+ year member]

I'm building a box for a 15" Fi BL. Outside dimensions will be 24" deep, 20" wide and 18" tall using 3/4" mdf. Port will be 2.5"wide by 16.5" tall. How long should the port be for roughly 32hz tuning? or if you could just give me a good formula to figure it out

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[slam 5,000+ posts]

http://subwoofertools.com/forum/ported-box.asp

 

[dman4486 5,000+ posts]

will be close enough

http://www.2k4civic.com/portcalculator.html