“When connecting this TV to my Receiver/sound system, is it better to connect using the optical connection or the hdmi ARC?”
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That is really a matter of personal preference and how you intend to use the TV, i.e. gaming or movies. Both HDMI and optical pass digital audio from one device to another. The biggest difference is that HDMI can pass higher-resolution audio, including the formats found on Blu-ray: Dolby True HD and DTS HD Master Audio. These formats can't get transmitted across optical. If you are in need of further assistance, please reach out to our support team on Twitter via @LGUSSupport or on Facebook at https://www.facebook.com/LGUSA or call at 800-243-0000. ^Daphane
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