LPF and HPF?

[Airmaster]

what should i set my LPF and HPF to?

As I've already said I have a 12 inch Polk, 425 watts, but I am still a little confused by what LPF and HPF do and how it affects performance.

My sony HU has 80, 100, 120, and 140 hz options and has normal and some other choice for the LPF. The HPF also has 80, 100, 120, and 140, no other options than that.

I thought I'd know most of this stuff by now, lol, guess I'm still stuck in the newbie zone...

 

[Jay FX4]

what should i set my LPF and HPF to?

As I've already said I have a 12 inch Polk, 425 watts, but I am still a little confused by what LPF and HPF do and how it affects performance.

My sony HU has 80, 100, 120, and 140 hz options and has normal and some other choice for the LPF. The HPF also has 80, 100, 120, and 140, no other options than that.

I thought I'd know most of this stuff by now, lol, guess I'm still stuck in the newbie zone...

Low Pass Filter blocks the higher frequencies and lets the low ones through and High Pass is the opposite.

It's a matter of personal preference, and you'll probably just have to keep tweakin' things until you get the sound you're looking for.

I have my HPF set at 95Hz. That blocks out everything below that frequency, but still lets some lows and mid-bass through to the door speakers.

Your LPF for your sub depends on how it sounds. Mine (Infinity Basslink) can sound muddy if it's allowed to reproduce the higher bass frequencies.

The type of music you listen to also is a factor. For music with a bass guitar, having the LPF set at 80Hz is too low, IMO, since a bass can cover a much wider range than just 80Hz and below. The sub should handle as much of the "load" as possible, therefore you need to allow it to cover as much of the low frequency range as you can, but at the same time, you don't want the sub wasting energy trying to reproduce frequencies that are too high. I'd set the LPF to 140Hz first, and let your door speakers cover the rest of the range. You may find that having your LPF and HPF set at or near the same frequency will sound the best, but it's still a matter of personal preference.

 

[baxtej44]

Low Pass Filter blocks the higher frequencies and lets the low ones through and High Pass is the opposite.

It's a matter of personal preference, and you'll probably just have to keep tweakin' things until you get the sound you're looking for.

I have my HPF set at 95Hz. That blocks out everything below that frequency, but still lets some lows and mid-bass through to the door speakers.

Your LPF for your sub depends on how it sounds. Mine (Infinity Basslink) can sound muddy if it's allowed to reproduce the higher bass frequencies.

The type of music you listen to also is a factor. For music with a bass guitar, having the LPF set at 80Hz is too low, IMO, since a bass can cover a much wider range than just 80Hz and below. The sub should handle as much of the "load" as possible, therefore you need to allow it to cover as much of the low frequency range as you can, but at the same time, you don't want the sub wasting energy trying to reproduce frequencies that are too high. I'd set the LPF to 140Hz first, and let your door speakers cover the rest of the range. You may find that having your LPF and HPF set at or near the same frequency will sound the best, but it's still a matter of personal preference.

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you should also be able to set your LPF's slope by moving it up or down. this will smooth out the transition, you could put it anywhere from +6db down to -12db on my HU, i have it set at -3 at 100hz and my HPF is set at 125hz.

you'll find that they still accept a little bit beyond those numbers (if i'm not mistaken), and i do not have door speakers right now, so yeah i'm probably losing a bit of the musical spectrum, but once i can get good quality door speakers, hopefully my not so great dash speakers won't be so disappointing.

 

[4x4fun]

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you should also be able to set your LPF's slope by moving it up or down. this will smooth out the transition, you could put it anywhere from +6db down to -12db on my HU, i have it set at -3 at 100hz and my HPF is set at 125hz.

you'll find that they still accept a little bit beyond those numbers (if i'm not mistaken), and i do not have door speakers right now, so yeah i'm probably losing a bit of the musical spectrum, but once i can get good quality door speakers, hopefully my not so great dash speakers won't be so disappointing.

yes

your HU and amp prolly have them them built in. but the HU only has control of the slope. i run my lpf at 80-90 depending on the size and type of sub.
but your HPF and LPF should be set very close together. or your going to lose part of your midbass. but were you set your LPf depends on the rest of your system to pick up the slack. if you just add a sub and everything is stock. you might want to swing it to 95ish but no higher. but it your running fully amped comp's you can drop it down to 75-80 and let your mids be played thur your comps

 

[Jay FX4]

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[Airmaster]

I have it at 100 lpf and 100 hpf, and since my sony head unit only allows 20 hz increments I may leave it here. I was thinking of lowering the sub to 80, but I don't want too much mid bass in my door speakers (if i lower hpf to 80), and i don't want to lose any midbass either (if I keep the hpf at 100).

I dont have components just 2 way infinity reference's. They're pretty good though, specifically with the highs.

 

[Loud Ranger]

you want to set them close together, some like a lttle overlap with them but some set them both at 80 its really up to you and how your speakers sound. And your not adjusting the slope only the cutoff frequency where the filter takes effect. some decks let you adjust the slope but it would be -6db -12db -18db and so on. that adjusts how steep the frequencies will be muted past the cutoff frequency.

 

[baxtej44]

sorry, used to using that phrase on another forum. i was just agreeing with what you said.