Panasonic TX-47AS800T Ehelp page 166

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
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HDMI2 (ARC function) terminals. But no video signals are output. To use
HDMI2 with ARC function, connect an amplifier that has ARC function and
set to use theatre speakers.
Functions > VIERA Link "HDAVI Control™"
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