Відео

Even though just the iPad speaker the 20 watt sounds thin lacks the punch, phatness of the other two, which is understandable given the design of the 20 watter, I personally would take the 1987x and have a tech install a ppimv

Thank you for sharing your eureka moment with us! Going to try this with my jtm45

Presence always on 6.

I love these videos. I like presence on 10 and treble set low, on any amps that have a presence control. It sounds more interesting on the top end. I'll often run a fairly treble-laden tone into distortion and cut the treble on the pedal, too, if I'm using a pedal instead of an amp for distortion.

Oh ny gosh 1959 all day. For everything.

Excellent video! It would be interesting to see how this would turn out on an amp like a Mk3 Boogie which i believe have a lot “more” going on when you turn the nobs. Even more interesting how this turns out with a clean vs a cranked amp. Im waiting for the next video on this topic!

exellent !!

EUREKA indeed 🤯

Presence is the only tone control that is part of the negative feedback of the amplifier, encompassing the final two stages of the circuitry. I feel that it can easily sound bad, an opinion supported by disappointment in recording. As it is a single pole filter its effect is overly broad. Use as little of it as you possibly can, making up in the tone stack if at all possible. I turn it off and leave it off unless I absolutely need it. Further, unlike tone stack bands that are interdependent, presence setting is unaffected by any other control, completely independent. Find a place for it and leave it there.

What neck profile and thickness do you have on your ‘60 custom shop?

It seems like a lot of commenters are bringing this concept over to amps with low/mid/high (instead of the four eq adjustments you have) I don’t think that’s a wise thing to do because in that case the frequencies you get from treble adjustment are very far away from the ones you get when adjusting the treble knob. Nobody would ever confuse or wonder when to use one vs the other in that case

On a Mesa Rectifier, the Presence knob is more useful than the Treble knob.

I’ve always just adjusted by ear. Treble for the amount of high fizz/crunch, and presence for air or clarity. Both around 2-3 on my Jubilee. Gain pulled out. Sounds epic with a bit of delay and a Mesa EQ in the effects loop. Guitar straight into amp: PAFJoe and Fred pickups, no tone control. Texas Specials also kick ass!

I had one of these back in early eighties. Unfortunately it was stolen and I had to buy Boogie MkIIB.

Very good info Johan. Do you have a Marshall Origin head with the Tilt knob that you can talk about?

Don't worry Johan....nearly everyone has no clue what the difference is. Thanks for this video though! The Legend Segeborn!

The difference is enormous. The Origin sounds great by itself, but seems to be a lousy pedal platform.

I love my 70 so much - I run it through a Marshall 1936V. It has this incredible percussiveness to it. In my band, I sort of function as both the guitarist and bass player via a Digitech Whammy on the +1/-1 setting, approaching the guitar a bit like a piano. The Bassman is perfect for that. When my disability made lugging it around too much to handle, I bought a Kemper Stage specifically to profile it so I could have a more portable version.

Been playing for a very long time and embarrassed to say, I’ve never thought of using presensce that way. It’s always “ start at 12 o’clock, tweak the eq and then dial in the presence” Great video. Cheers

God bless you sir for one of the best websites for us amp and guitar lovers

Unless it is on the extremes it doesn't really make that much difference except hotter will shorten tube life.

This video sounds like being in an actual room with the amp. What mic is that? And are there any other secrets to your recorded tone?

PREACH 🤘 The Resonance and Presence Controls to me is a built in Boost Pedal....For example my 5150 III can get tighter than a nuns biscuit by simpley lowering the Resonance to around 3, an the Presence Control at around 5. My Orange Rocker 15 lacks these Controls and relies on the master volume and a boost pedal to achieve a very similar goal. I find that the main difference is the feel of the amp, as all that tube sag, controlled feedback, and noise becomes part of a "Master Volume Tone" The dynamics are to much fun, as at this point as when you lay into your strings you can hear / feel the bass "fart out" become fuzz or what not or the high ends hiss out, as the 5150 III can get that very polished non dynamic feel / tone thanks to all them powerful control knobs and headroom 🤓🍻🤘

The presence adds or lows the overall brightness of the amp, the upper highs of the signal.

The presence knob is the setting I adjust last. I will start with all the knobs at 12 oclock, then adjust bass, mids, highs to taste. If I need to dial in some high end or take some away, I'll use the presence knob. I'll never run presence at zero or 100%, at most 3 oclock. Any higher it will sound shrill, and make your ears bleed!

Pretty sure Iommi never used G12Ms ..

I've always heard that you should set your EQ knobs to your general liking and then use the presence knob to suit different rooms or guitars. It seems to work well for me but maybe its just easier to fiddle with one knob than four on stage 😁

Sweet! Now I have a Marshall AND a Vox. I'm gonna try this with my sv 20. I also wanna see what it does with my Slo30.

Interesting demonstration. I liked the tone without it, but then you switched over to 100% presence and the whole thing lit up and it was way better. Neither tone was bad, both were very usable, but the presence control made it better.

Simply put, the Presence knob in a Marshall cancels harmonics generated in the amp section above ~2kHz as it's turned down, but the signal is instead compressed. When the amp section is driven hard enough to overpower the applied GNFB, the harmonics will jump out abrupty. The most gradual break up above 2kHz is therefore achieved by keeping the Presence up and the Treble down.

This is EXTREMELY apparent on blonde 6g6-b fender bassman heads! Presence control is awesome 🤟😎🍻💯🔥

The Blackflag sounded best on "7" . Something started to happen at that sweet spot. The amp already has the low end "thud", just adjust the eq and you got it nailed!.

Marshalls are CRAZY!! I love em!!!

The presence knob also has a bit of a compression/saturation effect of high end frequencies. With it in the off position you get a more open, transient, vox-like tone and with it dialed all in you get a more smooth, fender-type compression

Thought the Lemme stack would be really bass heavy but it sounded great. My back hurts just thinking of moving that 415 cab LOL! Thanks Johan

man, that's incredible! i never thought to try that. what a difference. thanks for this one. =)

I agree. The presence knob can have a dramatic effect. A good explanation and example!

Hey, what mic is that brother?

Johan-great video! Do you feel this amp is similar to a HiWatt? Marshall, Vox or Fender?

I like the sound without presence

I'd like to hear it with more gain for comparison too. Very interesting

Very illuminating! Now i have more to think about. Also, is resonance then a similar function but for the lower frequencies? 🤔

I suppose you should be getting more distortion with presence up since it's feeding more signal back. I guess the capacitor choice in the negative feedback loop also plays a role to how different it really starts sounding with presence, given that it shoves all unwanted signal in the loop to ground and as thus in cooperation with the resistor (in this case the potentiometer) controls the frequencies that boost the signal. Unless I of course remember the circuit wrong.

To me, a presence control affects the frequencies ABOVE a treble control. The presence knob on my Sunn model T that I've owned forever is the most powerful tone knob on the amp. It is a notably clean amp among most guitar amps. The other knobs are there for the ride as they are in their own "pocket". It was designed with a lot of negative feedback to keep it cleaner and more linear, from what I understand. In use, a presence knobs affects the higher frequencies in the same way that moving one's ears around a speaker cone/cabinet affects the tone. The higher the presence setting on the amp, the more it sounds like one's ears are centered in front the speaker cone/cones. I think of a presence control as a speaker/player axis control, as those higher frequencies are more directional.

Great explanation 🎉

Another interesting video from Johan. Thanks for posting 👍

Cool wall of art.

People confuse the purpose of the presence control. You have to imagine the amp without it all. The presence circuit is wrapping signal back around to an earlier stage, in an effort to make the output section have a more linear frequency response. Linear meaning a flat frequency response. When you turn the presence up, it is effectively taking the presence circuit OUT of the signal path for the frequencies that it is allowing to pass. I.E. The added brightness you get as you turn it up is the actual sound the amp would naturally produce... If you remove the presence circuit entirely, in an amp like the DSL40, JCM800, or any other amp that has one, you would absolutely cringe at how bad the amp then sounded. The presence circuit is a large part of what makes the amp sound the way it does. Without it, the amp will sound completely different. Amps that do not have presence controls/circuits, tend to have a more open, less compressed sound and a little bit less headroom. This is because the output section is doing as it does. The core sound of the amp in this case is settled with the tuning of the preamp section, or perhaps in the case of an AC30 style amp, a power section " Cut " control, which is simply using common mode rejection to reduce the highs from even getting into the power tubes to begin with. If you want to get an idea of how bad a JCM800 type amp sounds without the NFB loop, simply pull the feedback return path resistor, and be amazed at how terrible the amp will sound...

Oh man that tremolo is dark and has a lot of character. Awesome

I have a black 2x12 tuck and roll speaker cabinet. I got it from my father in law who saw it one day at a garage sale and thought of me. He said a family of rats was living in it 😂. I changed the speakers out and now it’s just my main cabinet. Such a great look. ❤