Panasonic TX-50AX802B Ehelp page 182

ARC (Audio Return Channel) is a function of digital audio output using
●
HDMI cable.
= Note =
During the operation, audio signal is output from DIGITAL AUDIO and
●
HDMI2 / HDMI4 (ARC function) terminals. But no video signals are output.
To use HDMI2 / HDMI4 with ARC function, connect an amplifier that has
ARC function, set to use theatre speakers and match the output setting in
ARC Output in the Sound menu.
Functions > VIERA Link "HDAVI Control™"
- 182 -