Sony DAV-SR4W Owner's Manual page 13

IR receiver
Used when the IR receiver of the surround speaker cannot receive infrared ray because of the position.
Connect to the surround speaker (L). For details, see "Using the IR receiver" (page 28).
When using the IR receiver stand, attach the stand so that both delta marks on the IR receiver and stand
are aligned.
IR receiver
Delta marks
IR receiver stand
Note
When you connect the IR receiver to the surround speaker (L), the IR receiver is activated and the IR receiver of the
surround speaker (L) is not activated automatically.
13 GB