How does the "presence" knob on the Para DI work ?

[rgp]

The presence knob on the para seems to help get rid of string noise. How does it work and is the knob called something else on other preamps. Thanks, Rod

[Pete Counter]

This is a quote from IGGS at the gear page
"Presence is a part of the negative feedback circuit that takes a portion of the output signal (usually a tap on the ot tranny) and most commonly feeds it back into the phase inverter part of the circuit.

Presence boosts high frequencies by actually cutting the amount of high frequencies being fed back which reduces the amount of hf in the negative feedback and therefore boosting the hf on the output.

Most amps with negative feedback have a tighter feel ... in addition to being able to shape the hf response this way, while amps without it tend to have a more looser bottom end with more sag. "
Some people say you could also call it a bright button. The reduction of string noise you mentioned is the result of rolling it off which is in effect, reducing presence. on my para DI I usually have it rolled almost all the way off.

[rgp]

So is it a treble EQ knob ?

[Pete Counter]

No, it doesnt just affect the treble, it affects the whole spectrum..its just more obvious in the higher frequencies.