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vent length

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Forum Name: Fiberglass, Fabrication, and Interiors
Forum Discription: Fiberglass Kick Panels, Subwoofer Enclosures, Plexiglas, Fabrics, Materials, Finishes, etc.
Printed Date: November 28, 2021 at 8:57 AM

Topic: vent length

Posted By: s_abercromby
Subject: vent length
Date Posted: September 22, 2007 at 8:06 PM

hey i'm building a custom center console with a sub box attatched to it for my truck, i have an alpine 10" type x and want a vented box, on their website ( and manual they show what internal volume and vent length and volume should be, the only thing is that my box doesn't have a side that i can put an 11x1" vent, i want to put a 15x1" vent, i tried using the port length calculator on this website, but i don't know if it works the same for a rectangular vent because it is for a circular port. i've also read that a bigger area port requires more length for the same effect. if this is true than why wouldn't people just put a 1" port so that the box can be a lot smaller and so can the length of the port.


Posted By: extacy
Date Posted: October 05, 2007 at 4:32 AM

Usually a 1" port is not put due to port noise.

Atleast thats what Ive heard, I use a 4" usually unless due to space restrictions im forced to use a 3"

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