Panasonic SC-BTT885 Owner's Manual page 12

Other device connection
∫ When the connecting devices have an HDMI terminal
e.g.,
AV OUT
Set Top Box, etc.
≥ When connecting to a device that outputs 4K signals, connect an HDMI cable to the HDMI1 IN terminal of the unit.
≥ HDMI standby pass-through
Even if this system is in standby mode, the audio and/or video signal from the device connected to the HDMI1 IN or HDMI2
IN terminal will be sent to the TV connected to the HDMI AV OUT terminal (the sound will not be output from this system).
Even while the unit is in the standby mode, you can change the input signal HDMI1 IN or HDMI2 IN by pressing [SELECTOR]
on the remote control.
∫ When the connecting devices do not have an HDMI terminal
e.g.,
12
VQT5F80
AV OUT
HDMI cable
(not supplied)
Set Top Box, etc.
Video game, etc.
OPTICAL
OUT
Optical digital audio cable
(not supplied)
AV IN
(ARC)
HDMI cable
(not supplied)