Dave Tweed wrote:
> The speaker is a very low-impedance source, and its AC current output is
> much more significant than its voltage output.

You just contradicted yourself.  "Very low impedance source" implies that
the voltage will be fixed, and the current whatever it needs to be.
Because of the very low impedence, I think the speaker acts much more like
a voltage than current source in this circuit.

> The AC voltage across the B-E junction is on the order of 1 mV or less,
> and the nonlinearity of this junction has little effect on circuit
> performance.

I agree that the very small amplitude of the input signal makes the
nonlinearity of the B-E voltage to current characteristic less noticeable.


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