Scott Dorsey wrote:
Sure. You take the output of amp A, and you run it through a 4 ohm
series resistor into the speaker. Then you take the output of amp B
and you run it into the speaker the same way. Then you drive the two
with opposite polarity sources.

Surely you get the same result much more simply by connecting the (+)
terminal of the speaker to one amplifier and the (-) terminal to the
other, and drive the apmlifiers with same polarity signal (allowing for
gain differences).

That's assuming the amp outputs are single ended and the the cold sides
are grounded or connected to each other to complete the circuit.

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