Panasonic TC-55CX650U Ehelp page 145

ARC (Audio Return Channel):
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A function of digital audio output using HDMI cable.
HDMI input (HDMIx in)
(Digital/Analog)
The default setting is Digital for the HDMI connection. (Digital input signal)
Select audio input terminal when a DVI cable is connected along with an
analog audio input signal.
: indicates the number of terminals
Reset to defaults
Resets all Audio adjustments to factory default settings.
Gray-out when using Home Theater.
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