> Ask yourself what happens if both inputs have the same signal (frequency
> and
> phase). In that case you'll get no output whatsoever.
>
> -- Bob Ammerman
> RAm Systems

But, that could be solved with a phase inverter on one of the inputs.

Though this is unusual, I don't see anything wrong with it. The speaker
has a "differential input." If you invert the signal going into the bottom
amplifier, the speaker becomes a summer.

Harold


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