I have the RX-V1400. Yes the manual isn't great. According to what I am reading, you may (stressing may here..) have the speakers wired to the wrong terminal. It appears they should be hooked up to Zone 2. I wish I had or knew someone else who has this setup. There is also a setting to turn the Zone 2 Amplification to "On" as well. Also V-Aux and Phono jacks inputs cannot be sent to Zone 2 or 3.

We wouldn't be laughing that evening when Grandpa came back with some whore he picked up in town.