[Richard Crowley]

"Todd H." wrote ...
My original point is that you're wrong to say that power consumption
of a an amplifier is "equally (as in 50/50) dependent on both" the
volume control and impedance of the load in all circumstances.

The point is that the amplifier can't "push" any more power than
the I/R limits of the source and load impedances. However, it
also can't "push" any more power than the input signal multiplied
by the gain permits, either.