Open the "Menu" on screen, go to "manual setup" then "speaker setup" check your settings on "surround rear" and "surround back" If your not using zone 2 and zone 3, in the menu for zone 2 amp, select "Ext" and "Ext" for zone 3. If you still have an issue, post a comment and I can help you some more. I am a Yamaha Dealer. Hope this helps
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