IcedEarth112
New member
when an amp has a presence dial, whats that do?
what is presence?
- Thread starter IcedEarth112
- Start date
greendy123
New member
Re: what is presence?
It basically lets higher frequencies pass through in the sound. So you sound is more trebly and more present on high settings. With it set low you sound can get more muddy or more bassy on lower settings.
It basically lets higher frequencies pass through in the sound. So you sound is more trebly and more present on high settings. With it set low you sound can get more muddy or more bassy on lower settings.
ratherdashing
Kablamminator
Re: what is presence?
It's basically an EQ control for ultra-high frequencies (higher than treble).
It's basically an EQ control for ultra-high frequencies (higher than treble).
chill
New member
Re: what is presence?
Presence is a treble control at the poweramp rather than the preamp. Most amps are negative feedback (NFB) amps, which means they feed a smallish inverted signal back to the phase inverter to lower the poweramp gain, which reduces the boominess, looseness, and midrange frequency hump that freewheeling non-NFB amps can have. The presence control shunts the highs out of the NFB loop so that they have more gain as they go through the poweramp. Resonance controls stop the low end frequencies going through the NFB loop, which give them more gain as they go through the poweramp.
(and FWIW, I do like non NFB amps for some applications, just a different flavor than NFB)
Presence is a treble control at the poweramp rather than the preamp. Most amps are negative feedback (NFB) amps, which means they feed a smallish inverted signal back to the phase inverter to lower the poweramp gain, which reduces the boominess, looseness, and midrange frequency hump that freewheeling non-NFB amps can have. The presence control shunts the highs out of the NFB loop so that they have more gain as they go through the poweramp. Resonance controls stop the low end frequencies going through the NFB loop, which give them more gain as they go through the poweramp.
(and FWIW, I do like non NFB amps for some applications, just a different flavor than NFB)
More-Gear-Than-Skill
New member
Re: what is presence?
Now that's an answer! Deep understanding, and a concise explain, :yourock: :argh:
chill said:
Now that's an answer! Deep understanding, and a concise explain, :yourock: :argh:
B
Breogan
Guest
Re: what is presence?
And many people think the famous tone of a AC30 it's because works in class A and a big part comes from the fact it doesn't have a NFB.
chill said:
And many people think the famous tone of a AC30 it's because works in class A and a big part comes from the fact it doesn't have a NFB.
aleclee
Major General GAS
Re: what is presence?
Actually, the AC30 is Class AB but you bring up a good point that its lack of NFB (as well as its cathode biasing) have a big impact on its tone.Breogan said:
