In the circuit below:
I often see capacitors like C4 added in the feedback path of a non-inverting audio amplifier, and often times I heard that it acts like a high-pass filter.
At low frequencies, C4 is open, and at high frequencies, C4 is a short circuit.
But R1 isn't changed. And there is no "DC blocking capacitor" shown by default. So does placing a capacitor in series with the "low-side feedback resistor" (R2 in the circuit) make the amplifier a high pass filter or a high shelf filter?