Cecil, W5DXP wrote:
"Are you not aware that resistors and capacitors possess inductance?"

Richard Clark well knows that. I`d wager he was thinking of curtailing
low-frequency transmission with a small coupling capacitance. He could
then limit high-frequency response with a large capacitance shunting the
transmission path. Or, he could have been thinking of a gyrator.

With both high-frequwncy and low-frequencies limited, a band-pass filter
results. Op-amp gain and feedback produce a rich variety of response
tailoring possibilities.

I bought and installed a Thordarson resonant equalizer in one of the 2A3
amplifiers I used to build long ago. It`s amazing the difference
passband slopes can make in the sound.

Best regards, Richard Harrison, KB5WZI