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Although the instant-on feature of the 950 (just like my TV has) may mean it is on always, anyway, at least to some extent, as long as it's plugged in.

The circuits that have to do with sound quality or lack of it are probably powered down when the 950 is in sleep mode. They would probably have just enough circuitry alive to respond to the green power button being pressed.

I wonder if a little bit of current might also run all the time through some other circuits when in stand by mode, as is done for TV's, or not.