Hi ! I'm new here.
I received my D50 a few days back, in order to replace the 2 devices (Armature Hecate as USB adapter, and TC Electronic BMC-2 DAC) I had until now between my digital sources and preamplifier.
Wasn't completely happy with the new sound of my hifi, compared to what I had just before - difficult to tell objectively, some coldness ......
I finally took my ohm-meter to check the RCA output of the D50, bingo as expected - the ground of the output is common to the 2 channels.
I'm lucky enough to own an Iso-Max CI-2RR isolator. Stuck it between the preamp and the D50, and guess what ........
Wonderful sound, a bit better than before, I'd say more clear at all levels.
I must say that the BMC-2 has separate ground on its XLR output, and the rest of my system is completely dual mono.
For what it's worth, but I guess that some people might be upset because of this ground issue, and having an expensive isolator could be a financial problem - that could be avoided with a DAC having a balanced output.
JMK