James tone stack

[hebaton]

I asked a similar question within a different tyhread but never got an answer so I try again.
With a James tone stack, the controls allow to shape either a peak or a dip around a mid frequency.
I would like to know how I can determine that "center frequency", the Q for it ?

THanks !

[martin manning]

Probably what you are looking for is here: https://www.ampbooks.com/mobile/amp-tec ... synthesis/