Ported Enclosure
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=37990
Printed Date: May 15, 2024 at 11:03 PM
Topic: Ported Enclosure
Posted By: proaudio
Subject: Ported Enclosure
Date Posted: August 23, 2004 at 11:12 PM
On the port length calculator on this website, you are only able to figure out specs for one port. If you want to do 2 ports, can you simply cut the length of the port in half and now have 2 ports? Such as: 1 port, 3" in diameter, 8 inches long, is the same as: 2 ports, 3" diameter, and 4 inches long?
Replies:
Posted By: auex
Date Posted: August 23, 2004 at 11:14 PM
Nope, unfortunatly it doesn't work that way. It is actually the opposite, the more ports the longer it will be.
Download WinISD, a pretty good box program.
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Posted By: CarAudioHelp
Date Posted: August 24, 2004 at 10:35 AM
I second WinISD. Here's a link:
WinISD link
If you want two ports the length to area ratio must remain the same. So the larger the port area, the longer the port (for a given tuning frequency). The WinISD calculator will solve all your port woes. -------------
Posted By: proaudio
Date Posted: August 24, 2004 at 12:17 PM
so basically if you have a 2" port 4 inches long, but you want another port, just put in another 2" port 4 inches long? WinISD is awesome, but i haven't found a part on it yet that shows a design for 2 ports. Thanks for all your suggestions
Posted By: CarAudioHelp
Date Posted: August 24, 2004 at 1:07 PM
No, that will double the area of your port and change the tuning. Click on the vents tab, choose the number of ports you want, the shape of the port you want, the diameter of the port you want and it will tell you the length you need. But you have to input your enclosure information so it knows what to tune the box to and what not. Here's a picture:
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