how to figure square port length

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Forum Name: Car Audio
Forum Discription: Car Stereos, Amplifiers, Crossovers, Processors, Speakers, Subwoofers, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=56110
Printed Date: November 03, 2025 at 7:40 PM

Topic: how to figure square port length

Posted By: beyma guy
Subject: how to figure square port length
Date Posted: May 20, 2005 at 12:23 PM

need to figure out how to figure square port length i want the box to be tuned to 35 hz and its 3 cubic feet

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my system
4 beyma ast05 tweeters
4 beyma w6 mid drivers
2 beyma nd 105 mid drivers
2 clif design competion 12subs
2 cd1.1lx amps
2 cd4.4lx amps
1 cd5.2lx amp
hu is a pioneer dehp8500 mp

Replies:

Posted By: j_darling2007
Date Posted: May 20, 2005 at 12:38 PM

We need to know 1)how big you want the square, OR 2) How long you want the port. Then we can tell you the other dimension to make the port.

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There are 3 kinds of people in the world, those who can count and those who can't

Posted By: DYohn
Date Posted: May 20, 2005 at 12:51 PM

Square (or rectangular) ports are the same length as round ones of the same opening area. You simply need to calculate the equivalent area of your square as if it was round; meaning, for example, a 4" round port is approximately 12.6 square inches in area. An equivalent rectangular port would be 6.3" X 2". The length of the two would be the same (for 33Hz in 3 cuft, approx. 7.5" long.)

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Posted By: soundmasta
Date Posted: May 25, 2005 at 8:18 AM

got on audiobahns websit and cheat. they have a great port calc. in their tech section.

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