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Sealed Subwoofer Boxes

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=59410
Printed Date: November 06, 2025 at 7:06 PM


Topic: Sealed Subwoofer Boxes

Posted By: davis87
Subject: Sealed Subwoofer Boxes
Date Posted: July 14, 2005 at 9:55 AM

I trying to find out how much cubic feet does my box have? I need to know how to measure it. Both sides should be equal since it is a sealed box with a divider right?



Replies:

Posted By: stevdart
Date Posted: July 14, 2005 at 10:35 AM

Use a flexible tape measure and reach through the empty speaker mounting hole to measure.  You want three measurements:  length, depth and height.  Do this for each chamber.

L x W (or D) x H = cubic inches.  There are 1728 cubic inches per cubic foot ( remember this number by multiplying 12 X 12 X 12 ).  So you will divide 1728 into the total cubic inches you arrived at.

example:  You measure 9.5 X 14 X 13.25 on the inside of the box.  Multiplied, the cubic inches is 1762.  1762 / 1728 = 1.02 cubic feet.

And yes, both chambers should be equal or very nearly so.



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Build the box so that it performs well in the worst case scenario and, in return, it will reward you at all times.




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