Hdmi Arc (Audio Return Channel) Explained - Sceptre U50 Manual

HDMI ARC (Audio Return Channel) Explained

This Sceptre TV has the feature ARC (Audio Return Channel) on HDMI 3. ARC is a
feature that enables a TV, via a single HDMI cable, to send audio data to an AV
receiver or surround sound DVD / Blu-ray player. This feature eliminates the necessity
of having a separate S/PDIF audio connection for sending TV audio to the receiver.
For ARC to work properly the following needs to be met:

Make sure the TV, the audio receiver both have the ARC function.

Make sure the HDMI cable is ARC capable (HDMI ver 1.4 or higher).

Make sure you are using ARC on the correct HDMI port. This TV's ARC
feature is on HDMI 3 only.
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SCEPTRE U50 UHD TV User Manual