Sony KDL-55HX755 Manual page 40

If connecting a digital audio system that is compatible with Audio Return
Channel (ARC) technology, use HDMI IN 1 on the bottom of the TV. If not,
an additional connection with DIGITAL AUDIO OUT (OPTICAL) is
necessary.
If the device has a DVI jack, connect it to HDMI IN 2 through a DVI - HDMI
adapter interface (not supplied), and connect the device's audio out jacks to
PC/HDMI 2 AUDIO IN.
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