The XBR2 has 3 HDMI inputs. One of these HDMI inputs has analog audio pair associated with it. (RCA X2)
Does anyone know how you can utilize the analog input along with the HDMI video?

Those analog audio input connectors are there just in case you happen to be using a DVI set top box (or DVD player, or other type of source). Since a DVI source can only send video, you need a way to bring in the audio for that TV's input.