Omg, why didn’t I see this a long time ago! Great explanation of how it works. I have a 400 watt HIWATT amp that has a presence control but honestly I don’t really hear a difference unless I crank that knob… it doesn’t seem to do much until the last 3/4 of the rotation. Maybe now what I’ll focus on is the feel of it more than the treble that I hear from it. I use that amp for bass guitar so maybe I should have it all the way down anyway… no?
Hey Man ,just found this channel, Subbed after 60; seconds, appreciate your delivery. Bass player forever, still learning how these things work! Hiwatt 100 Bass with Warwick 410 main rig... Yes there's a presence control.....
Very nice explanation Kley, I’ve read many books that explain negative feedback and the implementation of a presence control, but this is a great break down of the use of it and why we would want it in the first place. I’d love to see an video that covers Resonance (the low end equivalent) in the same way. Thanks for all these vids Kley! The DIY community thanks you!
Sure! It's quite simple, a Resonance or Depth control is also in the NFB loop - but instead of rolling low frequencies to ground (and therefore out of the NFB path), it sends high frequencies to ground. So think of the presence like a 'bass' control (high pass) in the NFB loop and a resonance like a 'treble' control' (low pass).
I've got a question; my amp is set this way: volume cranked up, Bass at 4 o clock, mids at 1 o clock and treble at almost 0, I keep the presence at 3 o clock.... I love the sound of this setting but there is only one problem... it is too loud, I mean it's too "ice picky," i don't how how to explain it, but it sounds too loud and goes direct to your ears... i think that correct term is" ice picky". I tried lowering the presence, but it didn't change much adn the sound became dull, i tried putting the treble to zero and the amp was still ice picky, the only thing that worked was either to crank down the MIDS o 9' o clock or lowering down the volume (both options change the tone a lot) specially lowering down the mids. what can I do to solve this problem? because I like my amp to have the master volume high at concerts. thank you for your future answer
It will do - for any amp. Distortion is primarily due to the introduction of higher frequency components by clipping the signal and "squaring" the waveform. Since PRESENCE is frequency dependant, it works more on the higher frequency components than the lower frequency components. The more you suppress the higher frequencies, the less distortion you will have. How much more the circuit acts on the higher frequencies than on the lower frequencies is determined by the position of the PRESENCE knobs.
@@kevinmcguinness1113 Why there is no distortion on bass? Actualy i heared audio examples of bass frequincy distorted but that is so rare and usualy done as i understand on vintage all hand wired and hand made valve devices. I am not engineer so i have no idea how those devises are made.
@GODenWord distorrion will be there if you drive the power amp section enough. The same concept of PRESENCE applies as for guitar amps, it just won't be as noticeable because of the lower frequencies and the far smaller frequency range.
A brilliant explanation about a feature that’s very difficult to put into words!..Well done..Thank you..
Thank you very much! This was very informative and detailed.
Nailed it again Kley with this video idea! I've always kinda wondered what a presence control does and why. Keep em coming!
I want to correct a mistake - at 1:50 the signal exits the CATHODE of that 12AX7 triode - not the PLATE. It is wired as a cathode follower. My error.
Omg, why didn’t I see this a long time ago! Great explanation of how it works. I have a 400 watt HIWATT amp that has a presence control but honestly I don’t really hear a difference unless I crank that knob… it doesn’t seem to do much until the last 3/4 of the rotation. Maybe now what I’ll focus on is the feel of it more than the treble that I hear from it. I use that amp for bass guitar so maybe I should have it all the way down anyway… no?
Another excellent informative video Kley! Thanks very much. You've clarified a great deal through your videos.
Hey Man ,just found this channel, Subbed after 60; seconds, appreciate your delivery.
Bass player forever, still learning how these things work!
Hiwatt 100 Bass with Warwick 410 main rig...
Yes there's a presence control.....
Very nice explanation Kley, I’ve read many books that explain negative feedback and the implementation of a presence control, but this is a great break down of the use of it and why we would want it in the first place. I’d love to see an video that covers Resonance (the low end equivalent) in the same way. Thanks for all these vids Kley! The DIY community thanks you!
Sure! It's quite simple, a Resonance or Depth control is also in the NFB loop - but instead of rolling low frequencies to ground (and therefore out of the NFB path), it sends high frequencies to ground. So think of the presence like a 'bass' control (high pass) in the NFB loop and a resonance like a 'treble' control' (low pass).
Thanks Kley, great video!
Cool info. Although a lot of this is over my head, the main idea makes a lot of sense.
Sidenote: Anyone ever tell you you've got a very calming voice?
Muy bien explicado, factores de riesgos y consecuencias me encanto. Saludos desde Argentina!!.
That was amazing, thanks a lot!
Very good video. Thank you
I've got a question; my amp is set this way: volume cranked up, Bass at 4 o clock, mids at 1 o clock and treble at almost 0, I keep the presence at 3 o clock.... I love the sound of this setting but there is only one problem... it is too loud, I mean it's too "ice picky," i don't how how to explain it, but it sounds too loud and goes direct to your ears... i think that correct term is" ice picky". I tried lowering the presence, but it didn't change much adn the sound became dull, i tried putting the treble to zero and the amp was still ice picky, the only thing that worked was either to crank down the MIDS o 9' o clock or lowering down the volume (both options change the tone a lot) specially lowering down the mids. what can I do to solve this problem? because I like my amp to have the master volume high at concerts. thank you for your future answer
Great explanation.
great vid dude.
In old Marshalls such as JCM800 2203 Presence also affects distortion of the amp.
The origin line too. Presence seems to affect gain
It will do - for any amp. Distortion is primarily due to the introduction of higher frequency components by clipping the signal and "squaring" the waveform.
Since PRESENCE is frequency dependant, it works more on the higher frequency components than the lower frequency components. The more you suppress the higher frequencies, the less distortion you will have. How much more the circuit acts on the higher frequencies than on the lower frequencies is determined by the position of the PRESENCE knobs.
@@kevinmcguinness1113 Why there is no distortion on bass?
Actualy i heared audio examples of bass frequincy distorted but that is so rare and usualy done as i understand on vintage all hand wired and hand made valve devices.
I am not engineer so i have no idea how those devises are made.
@GODenWord distorrion will be there if you drive the power amp section enough. The same concept of PRESENCE applies as for guitar amps, it just won't be as noticeable because of the lower frequencies and the far smaller frequency range.