I am not aware of any noises/audible distortions (such as when idle). As for black silences, the best I can say is that the silences are there and they are not there.
The silence is there because this is a very fast amp. The rise and fall time is as good as I've heard from any amp.
In fact, that is one of the biggest attributes with the LAE version and was known at the time as the fastest amp running. The Revision A meets or exceeds that speed. So silence in that there is inter-transient silence prior to the initial attack of a musical note.
The silence is not there in that well-engineered equipment (which includes fast transistors, etc.) will also pick up much more of the ensuing decay of a musical note after the initial attack whereas lesser components will not.
Therefore, a musical note lingers and evaporates more naturally into the noise-floor rather than dropping off prematurely.
Don't know if this answers your question or helps in any way, but after owning about 6 amps over a 3 year period, I haven't even considered another amp in the 27 months I've owned this Revision A model.
The only other amp I would entertain would be a DNA-2 Revision A Gold and the latest options McCormack currently offers.
This amp convinced me that the amp is the key to any system's performance. (whether good or bad).
-IMO
