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=40401
Printed Date: July 21, 2025 at 6:15 PM
Topic: Subsonic Filter?
Posted By: thapimpfromchi
Subject: Subsonic Filter?
Date Posted: October 06, 2004 at 3:12 PM
Hey guys, i'm just lookin at the spec sheet on my sub, to make a box, and it says to use a subsonic filter for the box I was looking at. What is a subsonic filter, and why would I use it with a ported box?
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1990 Honda Civic HB:
Clarion DXZ545MP H.U.
2- 6.5" Power Acoustik interiors
Diamond Audio 600.1 amp
Diamond Audio 15" M6MKII
Pyramid PB881X 4 CH. Amp
Replies:
Posted By: thapimpfromchi
Date Posted: October 06, 2004 at 3:20 PM
this is wierd. the 15" sub (the one i have) has a lower xmax than the 12 and the 10 inch versions. the 10 inch version has the highest actually. 18.3mm for the 10" sub, only 16mm for the 15" is that wierd to anyone besides me?
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1990 Honda Civic HB:
Clarion DXZ545MP H.U.
2- 6.5" Power Acoustik interiors
Diamond Audio 600.1 amp
Diamond Audio 15" M6MKII
Pyramid PB881X 4 CH. Amp
Posted By: pimpincavy
Date Posted: October 06, 2004 at 3:27 PM
A subsonic filter is used to filter out certin notes. Usually its used to block any Hz levels under 20. The human ear cannot hear anything under 20Hz, yet some songs have notes below that. The subsonic filter removes these notes so the amp and subs do not need top work at making notes we cannot hear. Quite a few amps have these, im not sure if you can get one to add on to a amp or not. Im also not sure why they would recommed this when dealing with a box. Maybe someone else can shed some light on that matter.
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Posted By: DYohn
Date Posted: October 06, 2004 at 3:43 PM
For ported enclosures, best power handling performance and maximum speaker protection is obtained by using a sub-sonic (basically a high-pass filter) just below the port tuning frequency. For sealed enclosures, a subsonic is used simply to keep very low frequencies from eating up amplifier power since the woofer cone remains dampened. They are also called rumble filters. If your amp or crossover or line driver does not have one built in, there are a few stand-alone filters available (Harrison Labs makes a nice one.) ------------- Support the12volt.com
Posted By: thapimpfromchi
Date Posted: October 06, 2004 at 4:04 PM
i have a knob for sub bass.. is that the same thing? ------------- 1990 Honda Civic HB:
Clarion DXZ545MP H.U.
2- 6.5" Power Acoustik interiors
Diamond Audio 600.1 amp
Diamond Audio 15" M6MKII
Pyramid PB881X 4 CH. Amp
Posted By: DYohn
Date Posted: October 06, 2004 at 4:14 PM
thapimpfromchi wrote:
i have a knob for sub bass.. is that the same thing?
Probably not, but what's the amp? ------------- Support the12volt.com
Posted By: jeffchilcott
Date Posted: October 06, 2004 at 4:16 PM
no. the knob is a gain control...you should have a crossover on your amp settings....As far as the excursion goes. alot of sub makers are like this. hell my eclipse's are light that, I have seen most audiobahn subs are like that as well...
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2009 0-1000 Trunk WR 154.0DB 2009 1001+ Trunk WR
2007 USACI World Champion
2007 World Record
2006 USACI Finals 2nd Place
Posted By: thapimpfromchi
Date Posted: October 06, 2004 at 6:48 PM
no, not the gain control. its got a sub bass knob too. its a Diamond Audio D3 600.1 I would take a picture for u but i cant find my digital camera at the moment.
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1990 Honda Civic HB:
Clarion DXZ545MP H.U.
2- 6.5" Power Acoustik interiors
Diamond Audio 600.1 amp
Diamond Audio 15" M6MKII
Pyramid PB881X 4 CH. Amp
Posted By: furflier
Date Posted: October 06, 2004 at 7:01 PM
The bass knob will boost your bass @ a certain freq. at around 45hz. -------------
Posted By: DYohn
Date Posted: October 06, 2004 at 7:02 PM
No, that control is a bass boost with frequency control. It's explained in your owner's manual. The amp does not include a subsonic filter. ------------- Support the12volt.com
Posted By: thapimpfromchi
Date Posted: October 06, 2004 at 7:03 PM
oh yea, i know what the bass knob does, im wondering if the knob on the amp named sub bass is a subsonic filter.
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1990 Honda Civic HB:
Clarion DXZ545MP H.U.
2- 6.5" Power Acoustik interiors
Diamond Audio 600.1 amp
Diamond Audio 15" M6MKII
Pyramid PB881X 4 CH. Amp
Posted By: thapimpfromchi
Date Posted: October 06, 2004 at 7:05 PM
aight. thanks dyohn. I lost my owners manual otherwise i woulda checked in there. I cant seem to keep track of those damned things.
-------------
1990 Honda Civic HB:
Clarion DXZ545MP H.U.
2- 6.5" Power Acoustik interiors
Diamond Audio 600.1 amp
Diamond Audio 15" M6MKII
Pyramid PB881X 4 CH. Amp
Posted By: thapimpfromchi
Date Posted: October 07, 2004 at 12:50 AM
Hey Dyohn, how much does one of those filters cost? roughly.
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1990 Honda Civic HB:
Clarion DXZ545MP H.U.
2- 6.5" Power Acoustik interiors
Diamond Audio 600.1 amp
Diamond Audio 15" M6MKII
Pyramid PB881X 4 CH. Amp
Posted By: thapimpfromchi
Date Posted: October 07, 2004 at 12:57 AM
i checked their site but I couldnt find anything like that. maybe i'm looking for the wrong thing.
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1990 Honda Civic HB:
Clarion DXZ545MP H.U.
2- 6.5" Power Acoustik interiors
Diamond Audio 600.1 amp
Diamond Audio 15" M6MKII
Pyramid PB881X 4 CH. Amp
Posted By: DYohn
Date Posted: October 07, 2004 at 11:32 AM
HP-Sub. Available from their eBay store for $16 plus shipping. A deal. ------------- Support the12volt.com
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