HPF/LPF list- which do you use or know about?

[dabis]

Be absolutely positive that you do not measure the output of any bridged amp (including most class D amps) without a proper ground isolation device... if you were to connect the laptop/computer interface to the speaker out, the minus terminal is not at ground and the changes are that you will destroy a perfectly good laptop or interface... as well as possibly your amp.

You need to know exactly what you are doing here, a little knowledge can be very dangerous. generally, there's no problem measuring a preamp output, but be sure that there's no 1/2-Vcc bias present, especially when plugging and unplugging the generator side of the test set-up.

You also need to know the absolute levels you will be dealing with, there are some really significant input limitations on these inputs, resulting in either completely inaccurate results, or damage to the interface (depending on how well they are protected).

Glups, thought it was easier... I was thinking in sending a signal and reading the apparels separated. For the head (Aguilar TH350) thought to measure it through the DI out. Which voltage do you recommend? 1v? 10v?

 

[agedhorse]

Glups, thought it was easier... I was thinking in sending a signal and reading the apparels separated. for the head (Aguilar TH350) thoguht to measure it through the DI out. Wich voltage do you recommend? 1v? 10v?

If using the DI out, you will need to convert to single ended to use your test setup unless your interface has a balanced input. If so, look at the nominal output level of the DI out and choose a range that's suitable. Since the nominal level is -20dBu on the TH-350 (per the owner's manual), start with 1V, and you may need to increase the sensitivity but be sure to use the scope function on the software to verify that you are not clipping the interface).

 

[Kevin Wolfe]

My Broughton Always On came in the mail today. Been noodling with it at the house but can’t tell much with Thais amp in this room (GK700RB/112). The true test will be next week at church with the boomy room and Ampeg. Can hardly wait.

 

[dabis]

If using the DI out, you will need to convert to single ended to use your test setup unless your interface has a balanced input. If so, look at the nominal output level of the DI out and choose a range that's suitable. Since the nominal level is -20dBu on the TH-350 (per the owner's manual), start with 1V, and you may need to increase the sensitivity but be sure to use the scope function on the software to verify that you are not clipping the interface).

Many thanks again. I think I have to learn a bit before start measure anything

 

[dabis]

[Invalid or Expired Link Removed]

"The MF-101 Lowpass Filter is an award-winning effect designed by Bob Moog. It contains the legendary Moog filter as well as an envelope follower for dynamic-controlled filter sweeps. Used with Bass, Guitar, Keys, Samples, or recorded tracks, the MF-101 is ready to be tweaked for classic Moog filter effects. Uncontaminated by the digital world!"

The simulated effect is also included on
Zoom MS-60B MultiStomp Bass Pedal

 

[JimmyM]

I know the Broughton because I have the separate H and LPF and have known FDeck for years and know his HPF only through pictures and words Very happy with the Broughton pedals...simple, tiny, does what I need and nothing else.

 

[dabis]

[Invalid or Expired Link Removed]

"The Stingray Multi-Filter forges an exciting new path in filter modulation. With its 12 filter effects, on-board overdrive, four modes of filter modulation, and full MIDI functionality (via the Neuro Hub) the Stingray goes way beyond most filter effects pedals. Dial in an expansive array of guitar tones, from swirling LFO psychedelia or super-funky envelope filter quack, to massive, synthesizer-inspired fuzz. Each of the Stingray's low pass, high pass, phaser, single peak, and multi-peak filter effects can each be controlled via any of the pedal’s four modulation modes: envelope follower, LFO, expression pedal, or Hot Hand. The Stingray’s four LFO waveforms include sine, square, random sample and hold, and saw tooth, and it’s easy to sync LFO modulation to a drummer or backing track with the pedal's handy Tap Tempo function."

 

[scottfeldstein]

Anyone have a minute to take me back to school? So my 5-string bass has a fundamental frequency low point of, what, 31Hz? I've heard it said, however, that what we're really hearing most of the time is a higher harmonic of this frequency. Thus, I could HPF out everything below 40 Hz and still have my b-string sound "right." Right?

 

[ahc]

Anyone have a minute to take me back to school? So my 5-string bass has a fundamental frequency low point of, what, 31Hz? I've heard it said, however, that what we're really hearing most of the time is a higher harmonic of this frequency. Thus, I could HPF out everything below 40 Hz and still have my b-string sound "right." Right?

That's right. You could even high pass higher and be good (say around 62 Hz which is the first harmonic of the B string). You could then increase your bass eq on your amp and sound right too without mud or unwanted, unhearable frequencies.

 

[David A. Davis]

Bergantino B|Amp
B|Amp Bass Amplifier

• Variable High-Pass Filter (VHPF): Adjustable from 30Hz to 80Hz in 2Hz increments

 

[Stumbo]

Anyone have a minute to take me back to school? So my 5-string bass has a fundamental frequency low point of, what, 31Hz? I've heard it said, however, that what we're really hearing most of the time is a higher harmonic of this frequency. Thus, I could HPF out everything below 40 Hz and still have my b-string sound "right." Right?

That's right. You could even high pass higher and be good (say around 62 Hz which is the first harmonic of the B string). You could then increase your bass eq on your amp and sound right too without mud or unwanted, unhearable frequencies.

Turn up the VHPF (variable high pass frequency) until your rig thins out and then back off. The exact frequency is less important than how you sit in the mix.

 

[scottfeldstein]

Turn up the VHPF (variable high pass frequency) until your rig thins out and then back off.

Exactly what I figured on doing, especially since my unit will have no frequency demarcations on the knob! I just know that it goes from 30 to 120 or something. I'll have to check the exact spec.

 

[agedhorse]

Exactly what I figured on doing, especially since my unit will have no frequency demarcations on the knob! I just know that it goes from 30 to 120 or something. I'll have to check the exact spec.

The frequency labels wouldn't mean much to the majority of players anyway. Preconceived understanding, especially fueled by some internet experts who understand the topic even less than those asking the questions, would have you believe numbers that bear no sense of reality to what the application might benefit from.

This is a challenge when introducing any new feature to a product, dealing with the "experts" who state how something works without the foggiest idea of how it actually works or is supposed to work.

 

[Stumbo]

The frequency labels wouldn't mean much to the majority of players anyway. Preconceived understanding, especially fueled by some internet experts who understand the topic even less than those asking the questions, would have you believe numbers that bear no sense of reality to what the application might benefit from.

This is a challenge when introducing any new feature to a product, dealing with the "experts" who state how something works without the foggiest idea of how it actually works or is supposed to work.

Would you please expound on your comments in terms of this thread and the HP mega thread?

 

[agedhorse]

Would you please expound on your comments in terms of this thread and the HP mega thread?

Players often think something different than reality, meaning that when you say the amp has a 35Hz HPF, it's unsuitable for 5 string because "everybody (on the internet)" knows that you need 31Hz to reproduce the fundamental. What they don't understand is that with a 31Hz fundamental, the signal is ~2/3 harmonics of the fundamental, and even without a HPF the speaker system wouldn't be reproducing even 10% of that 1/3 fundamental material anyway.

This is one of the reasons why I don't put intermediate frequencies on the faceplate, the fact that the scale is linear end to end should be plenty close enough for any player with an ear. If they don't have an ear, it's not going to matter anyway

When I introduced the more sophisticated HPF into products about 20 years ago, players didn't have any understanding why it was a good idea to do so, and in some cased rebelled against the feature by not buying an amp containing one. Of course it improved performance (and speaker reliability) by so much that it eventually became a no-brainer, but this is an example of the challenges of a new feature. The same can be said of SMPS's, class D, Neo speakers, etc. I have fought all of these fights and in the end they all became an accepted part of our industry.

 

[maurilio]

The frequency labels wouldn't mean much to the majority of players anyway. Preconceived understanding, especially fueled by some internet experts who understand the topic even less than those asking the questions, would have you believe numbers that bear no sense of reality to what the application might benefit from.

This is a challenge when introducing any new feature to a product, dealing with the "experts" who state how something works without the foggiest idea of how it actually works or is supposed to work.

 

[maurilio]

Players often think something different than reality, meaning that when you say the amp has a 35Hz HPF, it's unsuitable for 5 string because "everybody (on the internet)" knows that you need 31Hz to reproduce the fundamental. What they don't understand is that with a 31Hz fundamental, the signal is ~2/3 harmonics of the fundamental, and even without a HPF the speaker system wouldn't be reproducing even 10% of that 1/3 fundamental material anyway.

This is one of the reasons why I don't put intermediate frequencies on the faceplate, the fact that the scale is linear end to end should be plenty close enough for any player with an ear. If they don't have an ear, it's not going to matter anyway

When I introduced the more sophisticated HPF into products about 20 years ago, players didn't have any understanding why it was a good idea to do so, and in some cased rebelled against the feature by not buying an amp containing one. Of course it improved performance (and speaker reliability) by so much that it eventually became a no-brainer, but this is an example of the challenges of a new feature. The same can be said of SMPS's, class D, Neo speakers, etc. I have fought all of these fights and in the end they all became an accepted part of our industry.

 

[agedhorse]

Hi Mo!

 

[Stumbo]

Players often think something different than reality, meaning that when you say the amp has a 35Hz HPF, it's unsuitable for 5 string because "everybody (on the internet)" knows that you need 31Hz to reproduce the fundamental. What they don't understand is that with a 31Hz fundamental, the signal is ~2/3 harmonics of the fundamental, and even without a HPF the speaker system wouldn't be reproducing even 10% of that 1/3 fundamental material anyway.

This is one of the reasons why I don't put intermediate frequencies on the faceplate, the fact that the scale is linear end to end should be plenty close enough for any player with an ear. If they don't have an ear, it's not going to matter anyway

When I introduced the more sophisticated HPF into products about 20 years ago, players didn't have any understanding why it was a good idea to do so, and in some cased rebelled against the feature by not buying an amp containing one. Of course it improved performance (and speaker reliability) by so much that it eventually became a no-brainer, but this is an example of the challenges of a new feature. The same can be said of SMPS's, class D, Neo speakers, etc. I have fought all of these fights and in the end they all became an accepted part of our industry.

Thank you.

 

[maurilio]

Hi Mo!

Hello Andy! I see TB keeps you busy!
Joke aside, thank you for all you do and help!
Hope all is well up there!