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OK -
The top amplifier string produces a common mode signal (L+R) for all speakers. In the case of 2-way speakers, it produces separate common mode drives for the woofers and tweeters. In the case of three-ways, it produces a single common mode drive for all speakers.
The bottom amplifier then has center tapped output windings with the center taking the common mode L+R signal, so the end taps have ((L+R) + (L-R)) for the left and (L+R) -(L-R)) for the right.
I don't see the "extended stereo" switch on this page, so I assume it's on an earlier page where the (L+R) and (L-R) signals are developed, and controls the gain of (L-R). Is that right?
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