subsonic filters

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=98663
Printed Date: May 15, 2025 at 9:53 PM

Topic: subsonic filters

Posted By: killa101
Subject: subsonic filters
Date Posted: November 05, 2007 at 4:01 PM

I wanted to know how hard would it be to make a subsonic filter. I wanted to make one that goes in-line with my RCAs. Everytime i try to figure out how people tell me how to make one for my subs. I don't care how hard or expensive it would be I just want to know. Thanks.

P.S. - Please don't tell me to buy one!!!! posted_image

Replies:

Posted By: DYohn
Date Posted: November 05, 2007 at 4:05 PM

Try THIS. But yes, for best results you really should just buy one.

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Posted By: killa101
Date Posted: November 05, 2007 at 4:49 PM

I actually seen that one before. I was looking for one without a power supply. Something like the ones on this site.

https://www.hookeraudio.com/elec.html

Posted By: haemphyst
Date Posted: November 05, 2007 at 4:58 PM

Those are just RLC networks. Using basic crossover formulae, you can duplicate them but you must know the input impedance of your amplifier.

I've never been a fan of those, as the frequency can (and DOES) drift, based on the input impedance of the downstream device. BUT, if so desired, you can certainly build them quite easily for the purpose, and they will work.

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Posted By: killa101
Date Posted: November 05, 2007 at 5:59 PM

That what i was looking for. That is what i thought at first but people kept giving me complex circuits and such. I was thinking it was that simple.

Posted By: jmelton86
Date Posted: November 05, 2007 at 6:15 PM

I know you said not to tell you to buy any, but these'll work fine!

https://www.partsexpress.com/pe/showdetl.cfm?&Partnumber=266-246

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Posted By: sonofthor
Date Posted: November 08, 2007 at 3:31 PM

just wanted to say I got mine from Harris Labs and it looks like a nice piece of equipment - i think it is what you are looking for - adjustable subsonic filter from 20-40hz in 5hz increments.

They also were kind enough to enclose a pamphlet that was about the afterlife..