subsonic filter

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=58209
Printed Date: May 09, 2025 at 9:07 PM

Topic: subsonic filter

Posted By: Audiobahn1500
Subject: subsonic filter
Date Posted: June 22, 2005 at 2:32 PM

Hey all i got a quick question for you. Is it tottally necessary to have a subsonic filter when doing a ported box and what is the purpose of one. Also what can happen if you dont have one? will it damage the speaker? Thanks guys!!

Chad

Replies:

Posted By: Francious70
Date Posted: June 22, 2005 at 3:31 PM

Yes, very important.

What happens is below the tuning frequency is the sub moves into over-excursion with very little power.

Posted By: Audiobahn1500
Date Posted: June 22, 2005 at 4:33 PM

so then the subsonic filter stops this from happening i take it? how does it stop if though. I'm going to be building a box that is tuned to 35hz so what should i set the filter at then on the amp?

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Posted By: Francious70
Date Posted: June 23, 2005 at 10:31 AM

The sub-sonic filter is a high-pass crossover that operates at low frequencies.

Posted By: OhioMike1101
Date Posted: June 24, 2005 at 5:49 PM

If you are tuning 35hz and below it is not really neccessary for a subsonic filter. The sub will play the lows just fine. Below tuning, it is about motor strength.

PPL have been running ported subs forever without subsonics. They just came about in the last 5 years or so. They are not neccesary, but if you have it.... use it.

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