In Reply to: Hum when kit DAC is connected to an M2 posted by patro on June 16, 2011 at 02:23:17:
maybe a ground loop. Try a cheater plug or disconnect the ground wire in the power cable and see if the hum goes away. I've had sort of same issue with my M3 pre and DAC.
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Topic - Hum when kit DAC is connected to an M2 - patro 02:23:17 06/16/11 (3)