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Presence vs Dynamic Presence

shatteredsquare

Power User
Presence in the amp block is a power amp parameter, in most cases it manipulates negative feedback in the power amp to reduce or extend high end extension. In amps without negative feedback, the presence control is sometimes just another high filter in the preamp.

Dynamic presence is...presence...controlled by picking dynamics. It's in the Mesa Triaxis preamp hardware (USA Pre models), as a high end circuit that controls high end in response to playing dynamics. It looks like it's tied in with the power amp, so presence is a overall tonal center control, and dynamic presence is also tied into the same power amp. This got me thinking, I'm going have a go at setting the presence high and putting dynamic presence on negative settings...

https://forum.fractalaudio.com/threads/axe-fx-ii-quantum-rev-3-00-public-beta-2.113734/page-6#post-1360931
 

unix-guy

Legend!
Just FYI, the manual is a great resource for questions like this.

It's in PDF format and easily searched.

Check page 58 for details on the Amp block.
 

yek

Moderator
Moderator
Presence in the amp block is a power amp parameter, in most cases it manipulates negative feedback in the power amp to reduce or extend high end extension. In amps without negative feedback, the presence control is sometimes just another high filter in the preamp.

Dynamic presence is...presence...controlled by picking dynamics. It's in the Mesa Triaxis preamp hardware (USA Pre models), as a high end circuit that controls high end in response to playing dynamics. It looks like it's tied in with the power amp, so presence is a overall tonal center control, and dynamic presence is also tied into the same power amp. This got me thinking, I'm going have a go at setting the presence high and putting dynamic presence on negative settings...

https://forum.fractalaudio.com/threads/axe-fx-ii-quantum-rev-3-00-public-beta-2.113734/page-6#post-1360931
I don't think the actual Triaxis has this ability. It's Cliff's own creation.

The Triaxis does have Dynamic Voice, which is just an EQ, and a special Presence control which is represented in the Axe-Fx III models through "High Treble".
 

shatteredsquare

Power User
It does though, it was a new circuit idea at the time, from Triaxis manual...

PRESENCE: This control usually regulates either brightness or negative feedback in the power section of an amplif ier. In the TriAxis a whole new approach to this traditional circuit was taken. An actual dynamic feedback loop that compresses the highs and upper treble frequencies makes this PRESENCE control the first of its’ kind. In applying for the patent for this unique (high compression) circuit, we discovered that this same basic concept can apply to many parts of the tube amp in guitar amplification and your TriAxis is the first benefactor of such a breakthrough. With greater understanding and patent grants behind us, lets talk sound. As the PRESENCE control is increased, more highs are allowed to pass. The lower the signal strength at the input of this control, the more highs pass through it. The lower region of the PRESENCE control dampens these high harmonics. The greater the signal strength at the circuit input becomes, the darker the sound becomes. So...if you set the PRESENCE control high and pick softly (sending a small signal through the PRESENCE control circuit) the highs will be very prominent in the mix. If you decrease the PRESENCE control and pick harder (increasing the signal strength at the PRESENCE control circuit input) the high harmonics will be very subtle. In other words, the PRESENCE control helps enhance whichever direction you’re trying to go in with your sound and it does so dynamically! Most players love the way tube circuits react to subtle nuances in style...This PRESENCE control circuit takes that idea a few steps further. When you’re “going off” on the treble strings in a solo and you go for an expressive bend and lay hard into the note...TriAxis works with you! If you picked the note hard with the PRESENCE control set low, that note would become bigger, rounder and more compressed. Likewise, if you were doing some low growling work on the bass strings and the PRESENCE control was set high...you could relax into this segment and let the PRESENCE control make the edge. Most everyone that we know always wishes their high notes could be fatter and their low notes to be more discernible and articulate...highs where you need them, lack of highs where you don’t. Make sense...? If not on paper, then you need to plug in and experience the way this dynamic PRESENCE control can enhance your playing, especially when you are soloing.
 
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