Aerith Gainsborough
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Ah, I see.At the input to the amp, the audio signal is perfect when referenced to the DAC ground - but from the point of view of the amp - the DAC ground has noise on it, so the amp sees that noise on also on the signal.
Thank you for explaining.
Yep, that was what I was thinking about but you are correct: the noise rejection only works if both signal wires are affected equally (what would be the case if e.g.: a stage light near the cable were to interfere).(Differential amplifier)