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

*credit to the owner of the picture
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