LPF

Nickstevens3006

CarAudio.com Newbie
Hey all, I am kinda new to the technical things of car audio. I recently put 4 10” R2D4 rockfords running out at 2 ohms in a sealed box to a JBL A1000 amp. I’m curious as where I should set my LPF. I have my gain set at about 44 volts. The subs frequency response are 45-250 hz with sensitivity at 87 db. The amp has a LPF of 32-320hz/12db. I don’t know if any of that info is relevant, but any help would be appreciated. Thanks!
 

Nickstevens3006

CarAudio.com Newbie
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Kinda depends on how low your door speakers can play. i like to do under 100 hz on my filter.
I’ll have to see if I can find the box I remember they are kicker door speakers, but I can’t remember the model it was years ago when I installed them. Thanks for the help. Do you think 80hz would be a good setting?
 

SlugButter

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80 hz is exactly where I like to set mine. I’ve had to raise that before when I had rattling doors, before I discovered the miracle workings of sound deadener. I would set the HPF on my door speaker amp to limit the bass going to my door speakers until I heard less bass rattling in the panels, then set my LPF on my sub amp to match. With sound deadened doors, this became much less of an issue.
 
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Nickstevens3006

CarAudio.com Newbie
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80 hz is exactly where I like to set mine. I’ve had to raise that before when I had rattling doors, before I discovered the miracle workings of sound deadener. I would set the HPF on my door speaker amp to limit the bass going to my door speakers until I heard less bass rattling in the panels, then set my LPF on my sub amp to match. With sound deadened doors, this became much less of an issue.
Sounds good. Another question since there isn’t a way to know where 80hz is on the knob how do you know when you are at 80hz or around it?
 

SlugButter

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Sounds good. Another question since there isn’t a way to know where 80hz is on the knob how do you know when you are at 80hz or around it?
I actually don’t even use the filters on my amps anymore, since I’m running an active system on my head unit that lets me be really specific. Its probably just under the halfway point on the knob, if there isn’t any markings to let you know.
 
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hispls

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Sounds good. Another question since there isn’t a way to know where 80hz is on the knob how do you know when you are at 80hz or around it?
You really just need to guess. Just put it around 80 and do some music listening. Try to nudge it up a little higher do some listening, then a little lower and do some listening. When it sounds good it is good.

Really the point of this is to blend into the midranges. What we use in a car typically plays down to about 80hz safely (lower at lower power or if you have something out of the ordinary as far as equipment or install). Lower is better but hard to pull off without a lot of effort and expense. Much higher than 100 and many subwoofers don't really perform all that well and may start pulling the sound to the rear. Again aim for AROUND 80 and tweak it a little bit until it sounds best to you.
 

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