High Pass Filter (HPF) and Low Pass Filter (LPF) Mega Thread

[sstillwell]

I keep a Rane PE17 in a small rack of misc gear, which, in addition to the five bands of parametric EQ, also has a high pass filter and a low pass filter. Great for keeping excessive lows and irritating hiss out of unknown equipment. When needed, it usually it gets patched in at FOH. But I've also used it to clean bass amps and other problems on stage. I have another that lives permanently in my wireless acoustic rack for the low pass and to tame howlers. When you need it, there's nothing better. It's older and I'm sure discontinued, but can be found relatively cheaply. Digital mixing has meant that I'm using it less than previously at FOH.

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I have one of those in the rack with my M6 Carbine when I use my Bag End S15D stack. I can give it a little extra oomph in the low end and still cut off the LF enough to avoid unnecessary risk where the cabinet unloads. Highly effective piece of gear.

 

[alaskaleftybass]

As was covered previously, You can start by getting your rig off the floor with a stand or a rug, cardboard, or Auralex pad or something like it.

I use the Bro-ton always-on HPF. It works. It removes mud and gives you your amp tone, only cleaner.

No experience with the other.

Based on the website, the Omni has a few more eq tricks than the Bro-ton.

Just when I got it in my head I need a HPF someone comes along and confuses me with also getting a LPF! I only want to remove inaudible low frequency sound waves from my speakers as simply as possible-- battery operated, on off, always on, whatever. I'm going to go look for the Bro-ton.

 

[Mushroo]

Just when I got it in my head I need a HPF someone comes along and confuses me with also getting a LPF! I only want to remove inaudible low frequency sound waves from my speakers as simply as possible-- battery operated, on off, always on, whatever. I'm going to go look for the Bro-ton.

This is the specific one that runs on 9v batteries. (But it's out of stock until the 21st.)

https://www.broughtonaudio.com/product-page/low-high-pass-filter

 

[alaskaleftybass]

I'm realizing that it's actually, um... Broughton?

EDIT: Found this:

https://www.broughtonaudio.com/product-page/low-high-pass-filter

EDIT EDIT: So it looks like the Broughton will do both low and high pass. My Edens use a coax speaker so I don't have too much high end, and love the crispness the coax produces. I do however want to eliminate everything below.... well, what? 40hz? I guess that's my next question.

By the way, the HPF/LPF is out of stock until December 21. I didn't know they were handmade. That's nice.

 

[jastacey]

I had the chance to use my fDeck HP3 yesterday, and was I surprised at the ability in taming a signal, Frequency wise, I wish, I knew about this 20 years ago, this is always gonna in my gig bag/ signal chain, best money spent ... IMHO

 

[/\/\3phist0]

I'm realizing that it's actually, um... Broughton?

EDIT: Found this:

https://www.broughtonaudio.com/product-page/low-high-pass-filter

EDIT EDIT: So it looks like the Broughton will do both low and high pass. My Edens use a coax speaker so I don't have too much high end, and love the crispness the coax produces. I do however want to eliminate everything below.... well, what? 40hz? I guess that's my next question.

By the way, the HPF/LPF is out of stock until December 21. I didn't know they were handmade. That's nice.

I'm letting go of mine, ad not posted yet, pm me if interested

 

[Mushroo]

I do however want to eliminate everything below.... well, what? 40hz? I guess that's my next question.

That's a misconception about HPF's, that they "eliminate everything below." Rather, they attenuate at a continuous slope (as opposed to the Bass control on most amps, which is more like a shelf). Usually this slope is somewhere in the 6db-24db range, depending on the particular HPF. Frequencies below the "knee" will be quieter, but they're not gone completely.

I personally like my HPF around 80hz. That gives me -12db at 40hz (the fundamental of low E).

I have heard of other bassists setting their HPF's as low as 25hz, or as high as 120hz. Some bassists, rather than using a fixed setting, adjust their HPF variably as needed to "dial in the room."

 

[Downunderwonder]

I personally like my HPF around 80hz. That gives me -12db at 40hz (the fundamental of low E)

if you have -12dB of signal attenuation and add that to -10dB of cab sensitivity deficit you got -22dB before you even start in on Fletcher-Munson hearing sensitivity deficits and the fundamental general under representation in the string response.

Ears are magical in fillling in when the overtones are present. They are all of how you hear a low E different from the 2nd fret D one.

 

[aproud1]

Looking around at HPF circuit online and came across this. It's low fidelity apparently. I, my self want your hifi mamma.

Gob Instruments Small Fi 2018 Bass Cut Lo Fidelity effect pedal Passive EQ High Pass Filter

Verly likely it's somewhere in the past 70 pages. Didn't popup in the searches I tried.


Was looking into why there isn't an available on board HPF? I know one of my preamps has one and likely the cause of the easy to find tight bass in that particular instrument.

Does an onboard HPF exist???

 

[nnnnnn]

Does an onboard HPF exist???

Like on Mesa Subway amps? (D800 has a non-adjustable one built in; D800+ and WD-800 have variable HPF with front-panel knob.)

 

[Al Kraft]

Looking around at HPF circuit online and came across this. It's low fidelity apparently. I, my self want your hifi mamma.

Gob Instruments Small Fi 2018 Bass Cut Lo Fidelity effect pedal Passive EQ High Pass Filter

Verly likely it's somewhere in the past 70 pages. Didn't popup in the searches I tried.


Was looking into why there isn't an available on board HPF? I know one of my preamps has one and likely the cause of the easy to find tight bass in that particular instrument.

Does an onboard HPF exist???

Berg Forte has a fixed one, as does the Mesa D-800. The Berg B/Amp and Mesa D-800 and WD-800 have adjustable HPF's. My guess is a number of other amps do as well.

 

[agedhorse]

All Genz Benz amps do, as well as the Genzlers.

 

[Downunderwonder]

Does an onboard HPF exist????

depends on what you call an HPF. I think most amps have a 'rumble cut off filter'. Noteable exception for SWR.

I don't think the Genz amps have much more than 30hz worth of rumble filter but Agedhorse could remind me.

 

[aproud1]

Like on Mesa Subway amps? (D800 has a non-adjustable one built in; D800+ and WD-800 have variable HPF with front-panel knob.)

Berg Forte has a fixed one, as does the Mesa D-800. The Berg B/Amp and Mesa D-800 and WD-800 have adjustable HPF's. My guess is a number of other amps do as well.

All Genz Benz amps do, as well as the Genzlers.

depends on what you call an HPF. I think most amps have a 'rumble cut off filter'. Noteable exception for SWR.

I don't think the Genz amps have much more than 30hz worth of rumble filter but Agedhorse could remind me.

All cool amps and a great feature. The on board variables are the bomb!

But...

Was talking about onboard a bass. Like a preamp module you could add in between the bass out put and the jack. Or is there some reason that wouldn't work? That way you don't need a pedal.

 

[agedhorse]

depends on what you call an HPF. I think most amps have a 'rumble cut off filter'. Noteable exception for SWR.

I don't think the Genz amps have much more than 30hz worth of rumble filter but Agedhorse could remind me.

Depends on the model, but generally between 25Hz and 40Hz, 24dB/octave

 

[HD007]

Berg Forte has a fixed one, as does the Mesa D-800. The Berg B/Amp and Mesa D-800 and WD-800 have adjustable HPF's. My guess is a number of other amps do as well.

Does Berg Forte have one? I thought only B|amp did?

 

[dabis]

All cool amps and a great feature. The on board variables are the bomb!

But...

Was talking about onboard a bass. Like a preamp module you could add in between the bass out put and the jack. Or is there some reason that wouldn't work? That way you don't need a pedal.

I find this option a cool solution, cutting lows from the bass itself. I think it doesn't exist, looked for some months ago. Alembic has an onboard LPF (hi cut) as part of the unique electronic aproach these brand uses:
[Invalid or Expired Link Removed]
Link Removed

 

[Stumbo]

All cool amps and a great feature. The on board variables are the bomb!

But...

Was talking about onboard a bass. Like a preamp module you could add in between the bass out put and the jack. Or is there some reason that wouldn't work? That way you don't need a pedal.

I find this option a cool solution, cutting lows from the bass itself. I think it doesn't exist, looked for some months ago. Alembic has an onboard LPF (hi cut) as part of the unique electronic aproach these brand uses:
[Invalid or Expired Link Removed]
Link Removed

I think @Passinwind knows about this stuff.

 

[Stumbo]

Uncontrollable Boom!,(and what to do about it).

 

[aproud1]

Does Berg Forte have one? I thought only B|amp did?

The Forte has a fixed HPF at 40Hz.

I find this option a cool solution, cutting lows from the bass itself. I think it doesn't exist, looked for some months ago. Alembic has an onboard LPF (hi cut) as part of the unique electronic aproach these brand uses:
[Invalid or Expired Link Removed]
Link Removed

Alembic defininitley has the filters down!

I assume my East Uni-Pre has one or maybe the internal bass control can act like a HPF? That bass has a super tight low end and my HPF has no noticeable effect. Best preamp I've used to date and I've tried most. Pricey, but worth it.

Maybe I'll just have to bite the bullet and buy a new WD-800?