The first table for original 4 bands, 6 bands, and 10 bands:
The result is the value of P1 stereo potentiometers for frequency adjustment, and the capacitor of filter C(a) = C(b). If somebody have better expression please send me a message.
Another table just for variations:
See also:
 Simulation of UREI LP/HP filter module
 Modular, expandable parametric equalizer based on UREI546
 Simulation of 8 band parametric equalizer
 Simulation and software analysis of UREI 546
 UREI546 parametric EQ like URS VST EQ bundle
 Math expression for UREI546 parametric EQ design
 Parametric EQ Project  Modular UREI545 and 546
 Modular equalizer with gyrator filter
 PDF manual of modular gyrator EQ
 PDF manual of UREI 545 and 546 EQ clone

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