Zone 2 setup
You have to wire the Zone 2 speaker wires to the Surround Back pre-outs, they are the speaker terminals closest to the edge. After that, you have to go into the setup program, I think under speaker setup, and make sure Surround back is set to Zone 2. I am running a seperate Zone of speakers off of this and it works great. Another thing to keep in mind, you need to run Analog audio cables from any Input device if you want to hear sound on Zone 2, because Zone 2 doesn't support digital audio.
Hope this helps!