LG TV 60PN6500 User Manual

LG TV 60PN6500 User Manual Excerpts

Connecting to an Audio System
You can use an optional external audio system instead of the built-in speaker.
If you use an optional external audio device instead of the built-in speaker, set the TV speaker feature to off.
Digital Optical Audio Connection
Transmits the digital audio signal from the TV to an external device. Connect the external device and the TV with the optical audio cable as shown in the following illustration.