dante01
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ARC can convey anything that can be conveyed via S/PDIF optical as well as 7.1 Dolby Digital Plus. What cannot be conveyed via HDMI ARC is the 7.1 HD formats commonly associated with Blu-ray titles so you cannot bitstream 7.1 DTS-HD Master Audio or TrueHD via ARC and you cannot convey more than 2 channels of uncompressed PCM data via ARC. 5.1 DTS can be handled by ARC and is handled by it on many TVs.