Discussion in 'Amps and Cabs' started by Super Locrian, Oct 6, 2008.
Basic question: What exactly does a "Presence" control do?
Presence controls the negative feedback loop. When you add 'presence' you are actually keeping higher frequencies from entering the negative feedback loop and this makes your amp sound brighter.
Yeah it just controls the super high frequencies. There is a presence control on my Hot Rod Deluxe and it's very important to me on that amp.
Mesa uses presence controls as well.
Cob666 is spot on in his explaination
You guys pretty much nailed the explanation.
Point of clarity: Not to be confused with popular amp mods that control the entire range of negative feedback (Allen Amplifier's Soul Control, and Fender mods of the same name for instance).
So adding presence actually lowers the amount of negative feedback? That's the opposite of what I thought.
Presence control reduces the amount of negative feedback above the cutoff freq of the cap used in the presence circuit by shunting those frequencies to ground.
this is a question. . . not a statement:
so, normally your amp says, "hey, i'm going to take all of the frequencies above X and 'shunt' them to the ground so you don't hear them"
and you say, "nah, change X. allow more of them to pass through"
if disgottit, what are you 'telling' your amp? is it "lower the X?" (even though the knob tells you you are increasing your 'presence'?
i apologize for confusing anyone other than myself. . . . but i feel like igottit. .. . maybe