Tone control 3 bands

Jamesmeister · 03:28 AM

So i've found some schematic diagrams having 3 bands (treble,bass,mid) but i can't find any site showing equation on solving cut off frequencies on the 3 bands. i can only find the computation for treble and bass on james-baxandall circuit. we are given specifications(cutoff frequencies and cutboost) that we should meet to design the 3 band tone control circuit.

*credit to the owner of the picture

tinitus · 3rd March 2013, 06:32 AM

its commonly called 'tone stack'

mickeymoose · 3rd March 2013, 05:34 PM

Here is some of the math behind the circuit: Audio Tone Controls
The mid-band control parts values are established empirically as the math is complex and response is affected by the other 2 controls.
A good start is with C5 similar to C3 and C4 similar to C6 with C5 = 5x C4

3rd March 2013, 03:18 AM	#1
Jamesmeister diyAudio Member Join Date: Mar 2013	Tone control 3 bands So i've found some schematic diagrams having 3 bands (treble,bass,mid) but i can't find any site showing equation on solving cut off frequencies on the 3 bands. i can only find the computation for treble and bass on james-baxandall circuit. we are given specifications(cutoff frequencies and cutboost) that we should meet to design the 3 band tone control circuit. credit to the owner of the picture Last edited by Jamesmeister; 3rd March 2013 at 03:28 AM.*

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3rd March 2013, 06:32 AM	#2
tinitus diyAudio Moderator Join Date: Nov 2005	its commonly called 'tone stack'

3rd March 2013, 05:34 PM	#3
mickeymoose diyAudio Member Join Date: Nov 2008	Here is some of the math behind the circuit: Audio Tone Controls The mid-band control parts values are established empirically as the math is complex and response is affected by the other 2 controls. A good start is with C5 similar to C3 and C4 similar to C6 with C5 = 5x C4