Maybe there's actually a fault in the amp - the case is meant to be earthed, and somewhere inside there's a piece of circuitry that relies on this connection being present - but in your case that connection is missing.
That could explain the hum, and the fact that joining the SB ground to earth fixes it, and also the fact that joining the SB ground to the amp chassis doesn't. Next step: try connecting the chassis of the amp to earth and see if the hum goes away then too. (I presume, of course, that you're connecting to a bare metal point on the chassis - right?) -- AndyC_772 ------------------------------------------------------------------------ AndyC_772's Profile: http://forums.slimdevices.com/member.php?userid=10472 View this thread: http://forums.slimdevices.com/showthread.php?t=33414 _______________________________________________ audiophiles mailing list audiophiles@lists.slimdevices.com http://lists.slimdevices.com/lists/listinfo/audiophiles
