I previously had a 507 S2. You do need to send the unit back to be able to amplifier your zone B speakers from this unit. I had the same issue as you about not wanting to incure the cost and time to send it back. What I did was purchase a second 2-channel amplifier for the second zone and ran the pre-outs to the second amp. The disadvantage to this is that you can turn the second zone speakers on and off (by just turning the second amp on and off), but you are subject to the volume level in the second zone being the same as in the main zone. There may be another way, but if so I was not able to figure it out (after several calls to B&K, who at least are very nice and curtious).
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