“Regarding Zone 2 speaker operation, how does the Onkyo 656 differ from the 757? They indicate different descriptions, referencing an A/B switch on the 757. .”
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The 757 accommodates two pairs of zone2 speakers, zone2A and zone2B. The 656 only accommodates one pair of zone2 speakers. The A/B switch on the 757 allows you to turn both zone2A and zone2B off, play only zone2A, play only zone2B or play both zone2A and zone2B. On the 656 the single pair of zone2 speakers are either on or off. On both receivers you can only use the zone2 functions if you use 5.1 sound in the main listening room. The two amplifiers that are not used in the main listening room are used for zone2. If you use 7.1 sound in the main listening room then then all seven of the amplifiers are used in the main listening room and zone2 is not available.
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