The question is if it is reasonable to measure the stereo amp in such a "differential" way. signals are referenced to the common GND of the stereo headamp. input of the interface so the head amp is connected as a differential buffer except that pos. The stereo output of the head amp drives the diff. Next I connected differential cable from the 2i2 out to stereo jack of the head amp, so one channel of the head amp receives positive signal of the differential pair and the other channel receives the negative signal of the diff. As the result I've got a lot of mains harmonics (first attachment). pair is shorted to GND) from the 2i2 out to drive the head amp and SE-to-diff cable from the head amp out to the 2i2 input. ![]() ![]() First I used diff-to-SE cable (negative signal of the diff. I played with the interface by measuring my head amps.
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