a quiestion for the amp makers

[dschwartz]

well. finally i designed a nice tonestack (very nice actually) .. it´s active, versatile, with high, mid, low, and mid shift..

is very simple in concept, needs more parts than a regular tone stack, but i´m pleased with simulations..

This is the schem:


some explaining...
as oposed to typical tone controls, the bass control is a variable high pass, the pot controls the rolloff, at max it rolls off at 20Hz, and at min it rolls off at 1Khz (WAY effective!), the  treble control is a variable low pass, at max it rolls off higher than 10Khz, and at min it rolls off at 1.5kHz..

The mid control is a scoop filter, (thanks STM), it cuts mids around 800Khz, and the shift control moves the scoop between 400Hz and 1kHz

So, it affects the freqs that we want to affect, without any interaction
The tone loss of the passive net is really low!! less than -1.5dB, If you omit the input buffer, any impedance wil alter the frequency responses..

by the way.. this is a great tone control to add as a pedal!!!