ProtoDAC TDA1387 X8 project

[hifinet]

The phase shift at the corner frequency is 45 degrees. The ideal phase shift at 20 Hz is 0 degrees, but that is not possible. Once you add a first order high pass filter with the capacitor, it will cause a phase shift in the entire audio band (although it is very low and insignificant at 20kHz). The goal is to minimize the magnitude of the phase shift in the audio band.