Just connect the AV receiver to the CENTER SPEAKER IN terminal of the TV using a speaker cable, and your TV works as a center speaker.
[A] AV receiver
[B] Speaker cable (not supplied)
When you perform calibration, use the automatic calibration function of your audio system.
NOTE: The measured distance may be several meters farther than the actual distance.
If your audio system does not have automatic calibration, set the center speaker level of your audio system manually as you feel appropriate.