port volume

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=128027
Printed Date: May 02, 2025 at 10:46 AM

Topic: port volume

Posted By: jphill68
Subject: port volume
Date Posted: July 25, 2011 at 4:14 AM

If I have two subs that are in one chamber and share one port, should that port be twice the volume as recommended by the manufacturer? Or, should be the same volume as the manufacturer recommends for a single sub?

Replies:

Posted By: toy civic
Date Posted: December 06, 2011 at 9:36 PM

With two subs, volume is not the issue as much as the port surface area.

The port surface area must be 25% of the total surface area of the subwoofer(s). This is to prevent port noise and acheive the prope vent mach number.

Once surface area is calculated, then calculate the port volume based off of internal box volume..

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