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

[PraiseBassing]

Anybody following tha tread have experience with the HPF and LPF on the Tech21 Q/Strip?

Have no experience with the Q/strip, but from what is stated in the manual, you may want to try one first. The LPF at 3K would be a little low for my taste, but you could enjoy it. It’s really up to your ears. The HPF at 45 Hz probably won’t even be noticeable with normal playing and is a pretty good place for it. It could let you use the low knob a little more liberally, but I’m not quite sure how the low knob would affect the sound being a shelf with pivot at 1k.

 

[PraiseBassing]

I’ll add that while the Q/Strip seems to be a good “mainstream” inclusion into the HPF and LPF realm, I do believe you are better off with something variable.

 

[superheavyfunk]

Anybody following this thread have experience with the HPF and LPF on the Tech21 Q/Strip?

I have no experience with it but I will say that (on paper) it's the one product that makes me think about getting rid of my Broughton H+LPF.

 

[GroovyBaby]

Anybody following this thread have experience with the HPF and LPF on the Tech21 Q/Strip?

I do not but Ed Friedland does: Review: Tech 21 Q\Strip

 

[Stumbo]

I ordered a Broughton always-on HPF$(85 w/shipping) and a Truetone power unit($20) from Amazon.

I will be testing it with Sunn 2000s/200s/Acoustic 150 and various Sunn and Acoustic cabs.

See how it works with old school tube amps and 2x15 JBL cabs.
Also, I have an Acoustic 6x10 guitar cab to test. I've used the cab before without much bass in it for a rehearsal. See how that tests out as well.

One more cab to test is a 4x10 Sunn bass cab from the 80's.

 

[Taustin Powers]

I received my HPF/LPF from Broughton and tested it at last week's practice. The HPF did make an audible difference, but it wasn't dramatic. Had it set at around 50-60 Hz (4 string Thumb), and the low E was a little tighter and more defined.

The LPF will prove its worth at our next gig in June when my sound goes through the PA speakers.

 

[Stumbo]

I received my HPF/LPF from Broughton and tested it at last week's practice. The HPF did make an audible difference, but it wasn't dramatic. Had it set at around 50-60 Hz (4 string Thumb), and the low E was a little tighter and more defined.

The LPF will prove its worth at our next gig in June when my sound goes through the PA speakers.

From other posters, "turn the HPF up until the bass sounds thin, then back off just enough 'til it sounds full again".

 

[-Asdfgh-]

I ordered a Broughton always-on HPF$(85 w/shipping) and a Truetone power unit($20) from Amazon.

I will be testing it with Sunn 2000s/200s/Acoustic 150 and various Sunn and Acoustic cabs.

See how it works with old school tube amps and 2x15 JBL cabs.
Also, I have an Acoustic 6x10 guitar cab to test. I've used the cab before without much bass in it for a rehearsal. See how that tests out as well.

One more cab to test is a 4x10 Sunn bass cab from the 80's.

In the UK I can get one for £95 on Amazon. Hold on, no, that's just a book by someone called Broughton on FFTs

 

[-Asdfgh-]

Man, this thread is long. And in a short time. I apologize if this was covered.

I want a high pass, and possibly a low pass filter, in pedal format. Always on or switchable is fine, but I want the freq adjustable. Looking at the Broughton, but the hi and low combo pedal is sold out. The always on hi pass is appealing. Is a 10 band EQ pedal also effective? Or will it not cut everything off below the lowest freq?

Educate me!

I'm also interested in the bass EQ options.

I'm tempted by a 1u dual channel EQ or EQ/feedback eliminator for my PA and monitors. 1u is the space I have in the rack! Really I should get a bigger rack and a basic 1u stereo or 4 way compressor too.

 

[-Asdfgh-]

I'm almost curious enough to try my various speaker emulating DI boxes to see to what extent they will work as HPFs, in the sense of sweeping a sine wave through and measuring the response. It's more appealing than the DIY or cleaning the cat's litter box.

 

[Stumbo]

I'm almost curious enough to try my various speaker emulating DI boxes to see to what extent they will work as HPFs, in the sense of sweeping a sine wave through and measuring the response. It's more appealing than the DIY or cleaning the cat's litter box.

that would be cool. Post the sweep results if you can.

 

[kesslari]

I ordered a Broughton always-on HPF$(85 w/shipping) and a Truetone power unit($20) from Amazon.

I will be testing it with Sunn 2000s/200s/Acoustic 150 and various Sunn and Acoustic cabs.

See how it works with old school tube amps and 2x15 JBL cabs.
Also, I have an Acoustic 6x10 guitar cab to test. I've used the cab before without much bass in it for a rehearsal. See how that tests out as well.

One more cab to test is a 4x10 Sunn bass cab from the 80's.

Let us know how you like it.

 

[-Asdfgh-]

that would be cool. Post the sweep results if you can.

I was good and did the chores tonight, but I would like to see what it is I actually have in a practical test, as opposed to spec sheets. To the general public, the Behringer test will be most useful as I am not sure you can get the Award Session now.

 

[kevk]

Just cruised thru all 25 pages looking for OmniCabSim Deluxe discussion, in relation to the Broughton L+HPF pedal...I just picked up both.

I was thinking to use them (L+HPF>OCSD) at the ended the chain, but does one eliminated the need for the other?

It seemed logical (in my non-EE educated brain) that the OCSD was targeting specific frequencies to shape, whereas the L+HPF was taking care of the extreme bottom and high end, and both could be useful? Would it be appropriate to use both, or is one of them not necessary? Please educate me... (Btw, this thread is awesome!)

OCSD manual:
http://docs.wixstatic.com/ugd/b88141_956373bd49dc4180aa6153c8c60d795f.pdf

 

[Stumbo]

Just cruised thru all 25 pages looking for OmniCabSim Deluxe discussion, in relation to the Broughton L+HPF pedal...I just picked up both.

I was thinking to use both (L+HPF>OCSD) at the ended the chain, but does one eliminated the need for the other?

It seemed logical (in my non-EE educated brain) that the OCSD was targeting specific frequencies to shape, whereas the L+HPF was taking care of the extreme bottom and high end, and both could be useful? Would it be appropriate to use both, or is one of them not necessary? Please educate me... (Btw, this thread is awesome!)

OCSD manual:
http://docs.wixstatic.com/ugd/b88141_956373bd49dc4180aa6153c8c60d795f.pdf

I read the OCSD manual.

HPFs protect the low end of your speakers, cutting out freqs. that your cab does not reproduce well, whether of not the OCSD is in the signal chain.

Whether or not the LPF is useful will probably need to be tested. Seems to me if the OCSD is not always on, the LPF would be more useful.

Let us know how they work out.

 

[beans-on-toast]

Whether or not the LPF is useful will probably need to be tested. Seems to me if the OCSD is not always on, the LPF would be more useful.

A low pass filter is useful if you have high frequency distortion. It can tame a high gain amp or a distortion pedal that is good but over the top. It works in some metal bass applications but is more commonly used with guitar.

But yes, LPF is not something that you want on all the time.

 

[shwashwa]

A low pass filter is useful if you have high frequency distortion. It can tame a high gain amp or a distortion pedal that is good but over the top. It works in some metal bass applications but is more commonly used with guitar.

But yes, LPF is not something that you want on all the time.

Tone control on a passive Bass is a low pass filter. Mine is on all the time. On my bases that don't have that my Low pass pedal is on all the time

 

[beans-on-toast]

Tone control on a passive Bass is a low pass filter. Mine is on all the time. On my bases that don't have that my Low pass pedal is on all the time

If you want to retain the higher harmonics, you don’t want the LPF.

An external LPF can do a better job than the one in the bass depending on the filter design but it is also additive with the bass tone circuit so they can compliment one another.

 

[Stumbo]

A low pass filter is useful if you have high frequency distortion. It can tame a high gain amp or a distortion pedal that is good but over the top. It works in some metal bass applications but is more commonly used with guitar.

But yes, LPF is not something that you want on all the time.

@JimmyM uses an HPF/LPF to control what frq. range the FOH gets.

 

[beans-on-toast]

@JimmyM uses an HPF/LPF to control what frq. range the FOH gets.

For higher paying gigs, you can dial in more fidelity.