Sony BRAVIA XBR-55HX925 I-Manual page 96

Channel (ARC) technology, use HDMI IN 1. If not, an additional connection
with DIGITAL AUDIO OUT (OPTICAL) is necessary.
If the equipment has a DVI jack, connect it to HDMI IN 4 through a DVI -
HDMI adapter interface (not supplied), and connect the equipment's audio
out jacks to PC/HDMI 4 AUDIO IN on the rear of the TV.
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