+ the measurement resistor ... unless overall feedback is used (which it is, just very little of it) but that all is nothing compared to the 'room reading technology' (ahem DF worsener circuit)
Yes it is, at various frequencies and load impedances in order to fully characterize it.
That said, it is intentionally a high output Z as Bob does not care how it measures just how it sounds and it must sound different than regular amps.
If the harmonics don't do it the 'room reading circuit' will for sure.
I figure plenty people (Bob Carver fans) will like or even prefer it over 'regular' amps.