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

[Stumbo]

v

@Jazz Ad:
HPF is used to get rid of frequencies that can't be properly reproduced by the sound system. It prevents wastes of energy for the power amp, preserves loudspeakers and keeps the stage from rumbling.

The Meatbox, like all synths will greatly benefit from an HPF, coming out cleaner and punchier. It works over frequencies that are generally higher than the ones cut by the HPF. It also produces lower frequencies that will be blocked by the HPF and wouldn't be heard anyway.

There also are situations where HPFs aren't desired. If you play music that relies heavily on rumbling, like drone or electro you don't use HPF at all, vibrate the whole crowd and make sure you have a budget to replace woofers.

 

[31HZ]

I've got separate HPF and LPF boxes coming from Broughton.

As I'm just putting a pedalboard together for the first time (in 25 years of playing) as a result of much time spent chasing down certain tones, I've been doing a lot of research and experimentation. So I never would have found this HPF thread if it hadn't been for this stumbling around in the dark.

This may very well be the answer to the problem that I've always had but couldn't quite put my finger on. (I gigged an SM-400S and a Henry 8x8 for over a decade.)

Now to slip one onto my guitar player's board!

 

[Jazz Ad]

CAREFUL NOT PLEASING TO THE EAR.

 

[mbelue]

CAREFUL NOT PLEASING TO THE EAR.

That's an interesting video, really highlights the physical effects of a HPF on a speaker. Sadly it appears to be recorded with the camera's microphone which makes listening to it rather misleading, BUT I hear a very obvious difference between on and off.

The "farting out" that speaker does, sounds kinda pleasant to me through the camera mic, compressed via YouTube and out my headphones. I expect it to be much less pleasant in person.

 

[Microbass]

Is anyone making a cheaper HPF - Behringer or Joyo for example (can't seen anything on their sites)? I've only come across Fdeck clones custom built or Broughton. I'm not a fan of clones per say, but I'd rather spend £30 on one or a cheaper brand than £90+ for a custom build just to see if it helps smooth out things in our rehearsal space. I can only think of one venue I've had an issue with my sound.. and it's closed now.

 

[Wisebass]

Hi basst scho



That' s cheaper than 6 Mass beer at the Oktoberfest!

Tell us if it works!


greetings


Wise(b)ass

I'd rather spend £30 on one or a cheaper brand than £90+ for a custom build

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60 Euro Hotone?

edit: dang, someone bought the last one from Thomann?

greetings

Wise(b)ass

 

[BadExample]

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[Wisebass]

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Here we go!


Wise

 

[Microbass]

[Invalid or Expired Link Removed]

60 Euro Hotone?


greetings

Wise(b)ass

Looks like you're linking to a noise gate? I assume you mean the Q Box which is £80/$100 ..

 

[BadExample]

Looks viable. Not slothing around the effects forum for a long time, but don't recall any negativity towards Hotone, except how to pronounce it.

 

[Wisebass]

Looks like you're linking to a noise gate? I assume you mean the Q Box which is £80/$100 ..

Nope! The Hotone Skyline noise gate has a HPf and a LPF.

See link above

greetings

Wise(b)ass

 

[Microbass]

Nope! The Hotone Skyline noise gate has a HPf and a LPF.

See link above

greetings

Wise(b)ass

Ah nice one, it's showing as unavailable on Thomann but I'll have a look around! Thanks!

 

[soflbass]

I have a Hotone tuner pedal with clean boost adjustment. It's tiny but in a metal box and very durable. I haven't had any problems with it; works as it should. Ot appears this gate pedal is mounted in a similar tiny box. It would be nice to find out what the hpf curve slope is on this unit, as it seems to be tailored for guitar.

 

[Passinwind]

Is anyone making a cheaper HPF

Pretty much every DIY'er?

 

[Old Garage-Bander]

Pretty much every DIY'er? View attachment 3149827

I actually looked at doing a DIY build on one of Fdeck's HPFs.
He has a schematic posted on his website, though it's for one of his older versions.
I ran a cost sheet for all the parts from the least expensive sources with a home brew breadboard.
Seems like it still came up to about $40 bucks for everything, assuming you don't already have any of the stuff in your junk box.

I decided that when I get one I'd like to get the latest one he has out.
Even though doing this is well within my wheelhouse, I'd rather spend the time playing than doing a DIY.
I've got plenty of other projects in the cue as it is. One is a heavily modified Jag SS that includes stripping and painting.
So when the time comes, I'll just drop a C-note and change, his way and get the real deal.

It would be a good project though for anyone wanting to take on a roll-yer-own version of this.

 

[mesaplayer83]

I actually looked at doing a DIY build on one of Fdeck's HPFs.
He has a schematic posted on his website, though it's for one of his older versions.
I ran a cost sheet for all the parts from the least expensive sources with a home brew breadboard.
Seems like it still came up to about $40 bucks for everything, assuming you don't already have any of the stuff in your junk box.

I decided that when I get one I'd like to get the latest one he has out.
Even though doing this is well within my wheelhouse, I'd rather spend the time playing than doing a DIY.
I've got plenty of other projects in the cue as it is. One is a heavily modified Jag SS that includes stripping and painting.
So when the time comes, I'll just drop a C-note and change, his way and get the real deal.

It would be a good project though for anyone wanting to take on a roll-yer-own version of this.

I bought one of his HPF-3 pedal, and really liked it - I decided to flip it to a local bassist when I bought a Broughton Low+High Pass Filter, but will probably be buying another fdeck HPF-3 in the future as well - it's a really good pedal....

 

[Passinwind]

I actually looked at doing a DIY build on one of Fdeck's HPFs.
He has a schematic posted on his website, though it's for one of his older versions.

He has the v3 up there now. There's also the German kit that's been linked in this thread and a few other places. Haven't seen the price tag on that one yet. I've considered doing an open source one similar to my variable LPF onboard preamp, but right now I have a very full plate with commercial design work and it wouldn't be all that different from @fdeck's anyway.

 

[Stumbo]

Ah nice one, it's showing as unavailable on Thomann but I'll have a look around! Thanks!

Here's one : [Invalid or Expired Link Removed]

 

[adje]

He has the v3 up there now. There's also the German kit that's been linked in this thread and a few other places. Haven't seen the price tag on that one yet. I've considered doing an open source one similar to my variable LPF onboard preamp, but right now I have a very full plate with commercial design work and it wouldn't be all that different from @fdeck's anyway.

There is no fixed price for the DIY kit, as you have a couple of options to choose from: no case, a bare metal one, or one with the standard graphics, and two or three options for the knobs - all priced separately. As far as I can tell it's a very well conceived kit, all neat and tidy. (Still haven't gotten 'round to putting it together, but that"s entirely my own fault.)
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[stingray69]

Decided to buy one of those little Hotone Gate units - not to replace my primary HPF/LPF unit, but the size is just so convenient for a quick, throw it in your gig bag for rehearsal, etc.

Plus, noise gate and the cool, green LED knob - what's not to like? I can always return it if I don't like it.

The LPF range is a little high for bass, but still low enough to maybe put some tame on an active bass if needed. But the meat-n-potatoes HPF range looks good - just wish there were more info on the HPF slope it is using.