Question: is earc better than arc?
Answer: eARC and HDMI 2.1 While Dolby Atmos can be passed over regular ARC today (via Dolby Digital Plus) eARC offers improved bandwidth for higher-quality Dolby TrueHD and DTS-HD Master Audio streams, including Atmos. The new format also has lip-sync compensation built-in. ... You probably don't need new HDMI cables for eARC.