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Subsonic filter question

Old 03-22-2009, 03:49 AM
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Subsonic filter question

i Recently bought a jbl BP 1200.1 and ive read up and apparently they have no SS filter , is this actually affecting anything? If so how and why? and more inportant if it is how do i fix it if its a big deal. Thanks
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Old 03-22-2009, 07:58 AM
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so called 'subsonic' filters are used to remove the lower bass frequencies, generally to prevent a subwoofer from playing below tuning in a ported box.

If you have a setup where you are ported above 30hz then you could run into trouble with the sub unloading (which can cause mechanical damage)
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Old 03-22-2009, 05:48 PM
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Originally Posted by Haunz View Post
so called 'subsonic' filters are used to remove the lower bass frequencies, generally to prevent a subwoofer from playing below tuning in a ported box.

If you have a setup where you are ported above 30hz then you could run into trouble with the sub unloading (which can cause mechanical damage)


Well that sucks , my box is sittin around 45-48hz , What u gotta do to prevent this^^^ add like an eq of sorts or somthing?
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Old 03-22-2009, 06:18 PM
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inline rca bass blocker???? i dont think they even make on for that low lol.

no subsonic filter. man that must suck. i cant stand buying an amp without a variable subsonic filter
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Old 03-22-2009, 06:32 PM
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Originally Posted by AyZe View Post
Well that sucks , my box is sittin around 45-48hz , What u gotta do to prevent this^^^ add like an eq of sorts or somthing?
In your sig. it says your box is tuned to 35hz.....is it a ported box??

Unfortunately AFAIK there is no standalone SS filter available for mobile use....if you are running a sealed box it is not as much of an issue, a ported box will be a problem if you play loud music or test tones below the tuning frequency.......

HTH
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Old 03-23-2009, 09:17 PM
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Actual term is "Infra Sonic" having to do with hearing, not the speed of sound, as in Sub-sonic speed.
and I agree,not an issue unless your LP is warped ;-)
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Old 03-23-2009, 09:37 PM
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Get yourself a outboard active crossover that has a subsonic filter built into it. IIRC I have one at the shop that has overdone it's welcome. I will check tomorrow on it and pricing for it.
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Old 03-23-2009, 10:26 PM
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my sig is my old setup , to lazy to change it lol , now i got 2 rf t1 12's and the jbl 1200.1 in 3cu. tuned to like 48hz.

Last edited by AyZe; 03-23-2009 at 10:28 PM.
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Old 03-24-2009, 03:01 PM
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Originally Posted by Eli47 View Post
Actual term is "Infra Sonic" having to do with hearing, not the speed of sound, as in Sub-sonic speed.
and I agree,not an issue unless your LP is warped ;-)
I just knew one of the nit-pickers would jump on that part.......

I still have milk crates full of LPs.....hopefully still flat.....
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Old 03-24-2009, 06:24 PM
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Originally Posted by danyman View Post
inline rca bass blocker???? i dont think they even make on for that low lol.
perhaps this would work ??

Parts Express: FMOD Crossover Pair 50 Hz High Pass
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