I can't comment on the cream-faced units, but I have two black-faced
ones, and they hum like crazy. They are easily the loudest instruments
in my setup by far.

Fortunately, the hum doesn't make it into their audio signal, but there
appears to be radiated emissions from the M1000 audio cables into
surrounding equipment. As a result, I have to keep the M1000 audio
cables as physically isolated from other audio cables as much as
possible.

Keith