This is a simple adaptation of the Neve high / low shelf EQ found on a few famous model consoles. I had never noticed it on the online tone stack calculator before, so I thought I would try it out in spice using a Neve Preamp. The TSC version has a generic opamp in there for gain.
Speaking of gain, this doesn't have much - the input signal I used is -20db, which is roughly unity gain when set flat. Bear in mind that this is just one of several EQ sections, preamps and amplifiers in a channel strip - it should not have a lot of output, or it might overload other sections of the channel strip.
How is it different to the actual Neve circuit? The simplified version uses one capacitor value for set shelf frequencies. The Neve has a few capacitors on a rotary switch for variable shelf frequencies.
NEVE HIGH LOW SHELF EQ
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