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stupid box building

Printed From: the12volt.com
Forum Name: Fiberglass, Fabrication, and Interiors
Forum Discription: Fiberglass Kick Panels, Subwoofer Enclosures, Plexiglas, Fabrics, Materials, Finishes, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=116132
Printed Date: May 13, 2025 at 9:19 AM


Topic: stupid box building

Posted By: asquarecan
Subject: stupid box building
Date Posted: September 06, 2009 at 10:35 AM

Hey guys,

I am getting ready to build a box and I am using the sites calculator, I have built many sealed boxes but never a vented enclosure.

I am confused...

So I enter my dimensions i.e (26"x14"x14) which is 2.2ft3

Then i took that 2.2 and plugged that into the vent calculator building my vent 2"x12.5" tuned at 35hz and it tells me the vent needs to be 20.87 inches long.

Here is my question, do I now need to add that space to the outside dimensions of the box or is the calculator factoring everything in taking up internal space of the box?

Thanks
Keith



Replies:

Posted By: DYohn
Date Posted: September 06, 2009 at 12:18 PM
The calculator assumes you have already factored in the space consumed by the vent.  The volume you enter should be net, with vent, woofers, bracing, etc. subtracted.  With your 2.2 cuft calculation I suspect the real net volume you will end up is closer to 1.8 cuft.  If you want to have 2.2, you need to make the enclosure larger by at least the size of the vent.

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