W, welcome. There're two different ways to set up multi-zone with the 3805. One involves driving a separate amplifier in the second zone with pre-outs from the 3805. The other way, which I suspect is more likely what you have in mind, is to assign the amp channels for the back surrounds(assuming that you're not already using them for back surround speakers in a 7.1 setup)to instead power the speakers in the second zone. If there's some particular part of the manual that's unclear on the point(they try to make the entire manual confusing, but sometimes they slip up)maybe we could take a look.
