Connect with HDMI eARC/ARC
Use an HDMI cable to connect a Home Theatre System (HTS) to the TV. You can connect a Sony Soundbar or an HTS with a built-in disc player.
HDMI eARC/ARC
If your Home Theatre System has an HDMI eARC/ARC connection, you can use HDMI eARC/ARC connection on the TV to connect. With HDMI eARC/ARC, you do not need to connect the extra audio cable. The HDMI eARC/ARC connection combines both signals.
Since HDMI IN 3 (eARC/ARC) on the TV can offer the Audio Return Channel (ARC) signal, the TV can only send the ARC signal to this HDMI connection.
Audio to video synchronisation (sync)
If the sound does not match the video on the screen, you can set a delay on most Home Theatre Systems with a disc player to match the sound with the video.