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port size?

Printed From: the12volt.com
Forum Name: Car Audio
Forum Discription: Car Stereos, Amplifiers, Crossovers, Processors, Speakers, Subwoofers, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=129002
Printed Date: May 11, 2025 at 10:45 PM


Topic: port size?

Posted By: jlshea
Subject: port size?
Date Posted: October 29, 2011 at 3:13 PM

With a 4" PVC pipe inside diameter is 4" but outside is 4.5". Do you use the 4.5" diameter because that affects the box volume?? Using cal on this site 4"= 10.45"length 4.5"=13.7 length. The box vol is 1.75 Ft^3, Fb= 38

TK jim

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Installer dad



Replies:

Posted By: i am an idiot
Date Posted: October 29, 2011 at 11:02 PM
Use both.  Use the I.D. for the port size and length.  Then you have to use the O.D. to figure out how much volume the port takes out of the box volume.


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