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No need to use both. Coax would mainly only be used for those soundbars or amps that lack HDMI. HDMI can pass more formats at better quality. The main HDMI output is all you need. There is also a second, audio-only ouput on the Sony but again you shouldn't need to use it with your receiver.
Sorry, there was a problem. Please try again later.Hi Hoai, HDMI connection can also produce good sound. Thanks! ^Ron
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