Sony KDP 57XBR2 Operating Instructions Manual page 26

Setting Up the Projection TV
Connection
9 i.LINK S200
0 Service Only
qa REAR SPEAKER OUT
qs SUBWOOFER OUT
qd AUDIO OUT (VAR/FIX)
L(MONO)-AUDIO-R
16
Description
Used for connecting i.LINK equipped devices.
For Sony service use only.
Used for connecting optional rear speakers.
Used for connecting an optional powered subwoofer.
Connect to the left and right audio inputs of your audio or video component.