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Old 07-15-2009, 08:47 PM   #1
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what will A LPF (Low Pass Filter) do if set to wrong number for Sub?

I Have a 12" single sub in a sealed box and I think I have the A LPF (Low Pass Filter) set to about 100 should I try setting the setting different, what will be noticed by turning it down and up? I think it goes from 40 Hz to 240 Hz on my mono amp?
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Old 07-15-2009, 09:06 PM   #2
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It will activate the ejection seat mechanism for the rather loud chick that will not shut up sitting in the passenger seat. Play with the setting and listen to how it affects the sound.
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Old 07-15-2009, 09:34 PM   #3
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I just changed it to about 60 Hz and I didn't like it that much I turned it up to about 150 hz and it sounded better to me? Would it hurt it to go up to 240 Hz ,mark?
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Old 07-15-2009, 09:50 PM   #4
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You should stay within what your sub is rated for (usually around 300-500hz), but you're just adjusting the filter cutoff. So nothing is going to explode.

240Hz will be fine, but it will sound muddy. I suggest staying around 100hz, and set the HPF on your deck to match. (ex, 100hz on the HPF)
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Old 07-15-2009, 10:13 PM   #5
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if u want your subs to take highs do it
.... if u find u can hit all tones.. also your box has to support this setting.. try it at low volume and generally go up ... when it sounds like crap. turn it down and try gain at a new setting
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Old 07-16-2009, 12:07 AM   #6
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if u are west indian you should probably turn that up all the way. and turn your HPF all the way down/to the left.
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Old 07-16-2009, 07:28 AM   #7
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Originally Posted by Scottie View Post
I Have a 12" single sub in a sealed box and I think I have the A LPF (Low Pass Filter) set to about 100 should I try setting the setting different, what will be noticed by turning it down and up? I think it goes from 40 Hz to 240 Hz on my mono amp?
O.K. ... wow ... where some of these guys are going I have no idea. Adjust your LPF to around 80hz. That's because your highs won't go much lower than that so the sub will "take over" from that point down. If you have adjustments to control your highs, set the HPF to 80hz for your fronts/rears also. If you have a subsonic filter, you may not need it at all (sealed enclosure), or turn it on and leave all the way to the left (lowest setting).

Last edited by DeadlySones; 07-16-2009 at 07:33 AM.
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Old 07-16-2009, 09:22 AM   #8
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all that filter is doing is cutting off higher frequencies.
if you set it to 100, the sub will play sound that is filtered out above that to a certain degree(depending on slope)

the less broad a spectrum of frequencies a speaker has to play, the more efficient, clear and loud they will be. by asking your sub to play tones all the way down to 30ish and up to 150...and possibly more? thats alot of strain on the sub. it will not sound good like that.

i have my sub crossed at 85.

also , a subsonic filter will raise the power handling of your sub quite a bit by not allowing it to try and play frequencies below a certain setting. humans can only hear down to 20hz anyways, so usually anything below this is filtered out.

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(2)PRS-A900 / PRS-D1200SPL / GM-D7400M
High: ML28, Mid: L3SE, Low: ML 165 / Sub: (2)IDMax12 v.3 / Shaker: Buttkicker Mini

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Old 07-16-2009, 10:56 AM   #9
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Originally Posted by N130Gv2 View Post
O.K. ... wow ... where some of these guys are going I have no idea. Adjust your LPF to around 80hz. That's because your highs won't go much lower than that so the sub will "take over" from that point down. If you have adjustments to control your highs, set the HPF to 80hz for your fronts/rears also. If you have a subsonic filter, you may not need it at all (sealed enclosure), or turn it on and leave all the way to the left (lowest setting).
Yeah, what he said. ^^^^ My sub is crossed at 60hz and down to the subsonic at about 39hz. My fronts are set at 70hz and up. Start with it set at 100 and turn it down slowly until it sounds loud and clear to you.
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Old 07-16-2009, 11:01 AM   #10
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Personally I like 63hz as my xover point for my 12's but as you can see, it widely depends on ones setup.
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Old 07-16-2009, 11:01 AM
 
 
 
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