With due respect to "bigsmooth" I think we should clarify that while the 320 has the 'capabilty' of offering a 2nd zone with differing sources, It requires a second amplifier to drive the 2nd speaker set. As the way many people think of a "B" speaker switch; it does NOT have that!
While there are some decent arguements against a/b switches on-board, one manufacturer that executes it perfectfly is Marantz.
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