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port calculations

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=23296
Printed Date: May 14, 2025 at 7:34 AM


Topic: port calculations

Posted By: l7sdime
Subject: port calculations
Date Posted: December 24, 2003 at 10:26 AM

why is it that a 6 inch round port tuned to 35 Hz needs to be 13 inches long in a 4.5 cu ft box but a 2 inch round port only needs to be a little over an inch long?? what is up with that? how does that work?? it seems logical that the 6 inch port would have to be shorter because it can flow more air. what is a good port size to use? i have many different types of pvc and i am going to experiment with the box in my truck and try to port it. im using a hollywood excursion 15 a spl 820 amp and a 4.5 cu ft box. oh and i dont know if this matters a alpine cda 7892 h/u. the BLACK/ green flip down unit. thanks for the help.

           wes




Replies:

Posted By: Geeque
Date Posted: December 24, 2003 at 10:31 AM
Its all about tuning, doesnt have to make sense, just sound good.

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Gary Kline
MECP Master Technician


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