built a boost with a 15.5kHz LPF... thoughts on frequency?

[Skullsuicide99]

i designed/ tweaked a boost for bass (about 30db variable), and i put a ~15.5kHz LPF on it. I haven't had the best amp to try it on, i am just curious to see what you think of a ~15.5kHz LPF regarding bass signal.

i will happily take all thoughts, opinions, and critique.

cheers!

edit: typo

 

[DosiYanarchy]

Personally I think that might be too high of a frequency to really have any impact on the tone.

A hpf at, say 40hz, would tighten up the sound a little, which can be useful when boosting the signal for stopping things getting muddy.

 

[HoochfromP]

As for lpf, the idea is taming highs from fuzzes and distortion pedals, or to get in Motown-ish territory if set lower. My guess is 15,5kHz too high for both purposes.

 

[Skullsuicide99]

Personally I think that might be too high of a frequency to really have any impact on the tone.

A hpf at, say 40hz, would tighten up the sound a little, which can be useful when boosting the signal for stopping things getting muddy.

OK. I just wish I could put it through a decent rig to see. It totally neuters a guitar (which is obvious). Maybe drop it to 12kHZ? I just want to darken it up a bit.

It's all experimental at this point. Until I can try it on a solid rig, I will leave it as is but may add a HPF @ 40hZ. That could be interesting.

 

[Skullsuicide99]

As for lpf, the idea is taming highs from fuzzes and distortion pedals, or to get in Motown-ish territory if set lower. My guess is 15,5kHz too high for both purposes.

OK, thanks, I just posted, but as I said it's experimental. May add a HPF@ 40hZ as stated, maybe go down to 10kHz-12kHz

Thanks guys! I will let you know know how it goes.

This may warrant a trip to Sam Ash to run it through a proper rig. Lol. To see how it stacks up as-is.

 

[DosiYanarchy]

From what I've see , alot of speaker sims and speakers cap the top end response at around 5k, so (depending on the steepness of the filter) you might actually want lower than that for a darker tone. I find alot of the "attack" part of a signal is around the 1-3k range, so you may want the lpf to take effect from 1k if you're specifically looking for a 'dark' boost.

 

[Nashrakh]

15.5 seems awfully high. I know CRTs are mostly a thing of the past, but as far as I'm aware most people over a certain age can barely hear the 15khz squeal of a CRT in the first place if at all. You might make it easier on the yung'uns though, if your signal is loaded with hi-frequency garbage (which I dearly hope it is not!)

 

[Skullsuicide99]

From what I've see , alot of speaker sims and speakers cap the top end response at around 5k, so (depending on the steepness of the filter) you might actually want lower than that for a darker tone. I find alot of the "attack" part of a signal is around the 1-3k range, so you may want the lpf to take effect from 1k if you're specifically looking for a 'dark' boost.

Huh. I will do some tweaking for sure then maybe 1.5kHz would be good, as the math is quicker.

How do you guys feel about 30dB of boost? I can tweak that too while I am at it.

 

[Zooberwerx]

OK, thanks, I just posted, but as I said it's experimental. May add a HPF@ 40hZ as stated, maybe go down to 10kHz-12kHz

Thanks guys! I will let you know know how it goes.

This may warrant a trip to Sam Ash to run it through a proper rig. Lol. To see how it stacks up as-is.

Too high IME. If you can't get down to 3-5 khz, it's a lost cause. I use a Broughton HPF/LPF and speak from experience. Also pulled the manual for the Tech 21 Q Strip and the pre-set point is 3 khz which goes hand-in-hand with cabinet simulation. I know what you're thinking: "man, that's low!". Keep in mind that the LPF is providing 12dB of attenuation / octave and not a "brick wall" as often assumed.

Riis

 

[DosiYanarchy]

How do you guys feel about 30dB of boost? I can tweak that too while I am at it.

To be honest, I'm not sure what that equates to as actual loudness , but personally unless I'm trying drive the hell out of a preamp/valve amp, no boost pedal I use goes above 12 o clock.

My Bass VI uses pretty weak guitar pickups, so I use a boost set to a bit above unity gain but alot is the time I feel that the majority of boost pedals have far more output than I'll ever need.

 

[GMC]

Old school bass cabs didn't have any high end tweeters, so most of the PA sourced bass drivers rolled off around 3khz ish. There's a little bass out put above this figure, up to about 8khz. But it's mostly fret noise and fret clank. Fretless players / fat wound will be familiar with the lower top end that flats have. Effects users can see anything up to 16khz on bass...but to be fair a lot of this can sound over bright.
If I wan't old school overdriven sound, then dial in a steep drop off at around 3.5khz or 2.5Khz if you want a very dark tone. If you just want to eliminate hiss...then a steep roll off over 12khz should do the trick. If you are looking to protect your drivers from sub bass thump, then steep cut below about 45hz.

 

[Jazz Ad]

Perfectly useless othan than to clean up potential dirt. Many people don't even hear sounds at 15kHz.

 

[Bob_Ross]

A well-respected recording engineer who I worked with ~35 years ago said "There's nothing useful above 10kHz from a bass guitar" and in all the ensuing years I have yet to find that observation incorrect.

 

[Frank77]

30 dB is a heck of a boost (most para EQs I've seen are in the +/- 15 to 18 dB range)...is it on/off or can you adjust via a pot?

Side question: A para EQ is not giving you the results you're after?

 

[knumbskull]

My preference would be 5khz... but i tend to roll off pretty heavily over 2khz so what do i know

 

[Passinwind]

i designed/ tweaked a boost for bass (about 30db variable), and i put a ~15.5kHz LPF on it. I haven't had the best amp to try it on, i am just curious to see what you think of a ~15.5kHz LPF regarding bass signal.

i will happily take all thoughts, opinions, and critique.

15.5KHz at what slope/filter order?

You might ask the same question on this thread, which I, ahem, do have some self interest in: The Passinwind Open Source Preamp

 

[Eddie LeBlanc]

do your math..... A HPF is what is allowed to pass through the amp to the speaker I thought. At least that is how it works on my Bergantino B|Amp.

LPF ought to be what is cut out of the amp... I can't see how any usable information is in the 15 KZ range for a bass. Bass harmonics are not even that far up there that much.

E string is 41 hz fundamental. G string is 98 hz. Even the D# note of the G string is only 311 hz.

 

[Skullsuicide99]

do your math..... A HPF is what is allowed to pass through the amp to the speaker I thought. At least that is how it works on my Bergantino B|Amp.

LPF ought to be what is cut out of the amp... I can't see how any usable information is in the 15 KZ range for a bass. Bass harmonics are not even that far up there that much.

E string is 41 hz fundamental. G string is 98 hz. Even the D# note of the G string is only 311 hz.

View attachment 3865580

i realize that the frequencies are much higher now, i just overshot it. I wasve been unaware of how high the bass harmonics get. i wanted to increase boost but have LESS attack at the volume, lose the top and the attack and the snap.

i realize an HPF allows higher frequencies to pass. i may be adding one too.

I wanted a LPF to eliminate the attack and pop. i will pop it down to somewhere between 2-3kHz when i get the time and check that out.

but yeah, i guess i did overshoot it, not a problem, its all about learning and experimenting to figure out what works and for me it is entertaining, and fun.

i will adjust and come back.

 

[Skullsuicide99]

15.5KHz at what slope/filter order?

You might ask the same question on this thread, which I, ahem, do have some self interest in: The Passinwind Open Source Preamp

that is really cool i read it for a bit.

i am set on what i am doing at the moment, just adjusting it to a different frequency. its just a few minutes of math, and some soldering when i get around to it.

what i am seeking is a heavy dB boost that takes out the 'attack' and 'pop' although some may like that. i am just bored and entertaining myself with this.

 

[Skullsuicide99]

A well-respected recording engineer who I worked with ~35 years ago said "There's nothing useful above 10kHz from a bass guitar" and in all the ensuing years I have yet to find thatobservation incorrect.

I haven't had the luxury of meeting somebody with that experience. i will take note of that.

30 dB is a heck of a boost (most para EQs I've seen are in the +/- 15 to 18 dB range)...is it on/off or can you adjust via a pot?

Side question: A para EQ is not giving you the results you're after?

not really what i am looking for either TBH. i just want a big variable boost, that eliminates a lot of the clank, attack, and pop. Nothing parametric. just a simple RC filter.

My preference would be 5khz... but i tend to roll off pretty heavily over 2khz so what do i know

good reference points to know.


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i am just bored and entertaining myself, thank you all for the input. i am an electronics geek who has parts around and just feel like some experimentation.

but what i am looking for is a TON of gain, NO pop, clank, snap, etc.

there is a use, once its dialed in i will try to get a way to record on a decent bass amp and show you all why, or who knows, maybe its a massive flop. either way i am just passing time.