Formula for subsonic filter frequency?

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=82427
Printed Date: May 13, 2025 at 12:23 PM

Topic: Formula for subsonic filter frequency?

Posted By: luckydevil
Subject: Formula for subsonic filter frequency?
Date Posted: September 03, 2006 at 3:15 PM

I've been searching everywhere for the last couple days on something that definitively explains how to properly calculate the best subsonic filter frequency for a ported enclosure and subwoofer.

I searched here, BCAE, google, and every other car audio forum I could find and came up empty handed.

The subwoofer I would like to use as an example is the JL 6W0-4 in JL's recommended ported enclosure.

Driver and enclosure specs here... LINK

Thanks ahead of time for any help.

Replies:

Posted By: DYohn
Date Posted: September 03, 2006 at 3:28 PM

Set your subsonic filter at or just below your port tuning frequency.

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Posted By: kfr01
Date Posted: September 03, 2006 at 3:32 PM

DYohn is right, of course.

If you want to see how a subsonic filter affects excursion and frequency response, they can be modeled in WinISD.

Cheers

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New Project: 2003 Pathfinder

Posted By: luckydevil
Date Posted: September 03, 2006 at 3:41 PM

kfr01] wrote:

DYohn is right, of course.

If you want to see how a subsonic filter affects excursion and frequency response, they can be modeled in WinISD.

Cheers

GOOD STUFF! I wasn't aware of that in WinISD.

Thanks guys!

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