The 651R, 751R and 751R V2 allow you to run an independent zone 2. This means you can run audio and video into a second room, and then watch or listen to different sources in both rooms.
Our zone 2 also features our unique “Follow Main” option. “Follow Main” lets you listen to the same audio source that is playing in the main room, in the second room, including HDMI and digital sources (most modern amps will only let you hear analogue sources in the second room).
So, with Follow Main, whatever source that the AV Receiver is playing in the main zone can be made available as a two channel downmix for zone 2.