I need to use a HPF for my headphone amp and I want some suggestions about at what frequency I should place the cutoff frequency.
Currently I want to use a HPF with a fc=15~20Hz but this gives me -3dB at 20Hz.
Is this acceptable or do I need to go lower to get not dump the "bass" so much? The one I have is made with a 1uF polyester cap and a 10k ohm resistor (I also have a 50k potentiometer that drops that resistance to about 8.3k.)
Also I might fiddle with the negative feedback path of the opamp to boost the "bass" by adding a cap and resistor in parallel with the feedback resistor.