True, but they use a sliding bias on PS voltage for the output stage. 4 steps of it switched as the signal level varies. Don't know that it causes any issue.
My little Krells have stepped bias, not sliding.
Never noticed any audible artifacts.
Power consumption at the wall steps up with something like 100W (idle and small signal) then 150 250 400 600 W - not exact figures, just the essence of what I remember it draws, for 30 seconds or so, once the input level "demands" a higher output level, before it backs off to a lower level, if the input doesn't demand the higher range again.
So, for each (monoblock) 30W standby, 100W idle and moderate listening, and a few steps (five? seven?) to 1700W claimed max draw for 350/700/1400W claimed output at 8/4/2 ohms..