2026-11-02
TTBy Tonetron Engineering Team · Dongguan Taitron Electronic Limited
What does ARC or eARC require from the cable?
ARC runs on the audio return channel; eARC needs the Ethernet/HEAC channel and more bandwidth — a basic cable can fall back to ARC or go silent.
Answer: eARC needs the HEAC (Audio Return + Ethernet) channel and enough bandwidth for object-based audio — a Standard-tier cable may not have either.
- ARC carries compressed audio back from the TV to the receiver on the same cable.
- eARC carries higher-bitrate formats and depends on the Ethernet/HEAC pair; cables built without it fall back to ARC or produce no audio.
- Symptom to look for: picture is fine, sound is missing or only stereo.
If a customer reports "video OK, no sound", test the same cable on a plain source before blaming the TV firmware.
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Frequently asked questions
Does eARC need a special HDMI cable?
Yes — eARC needs the HEAC (Audio Return + Ethernet) channel and more bandwidth than ARC; a basic cable may fall back to ARC or go silent.