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The Optical port does indeed support Dolby Digital 5.1. Hope this helps! Thank you, TCL Customer Support
Sorry, there was a problem. Please try again later.Hi— This unit's optical (digital audio) port supports 5.1/7.1 Dolby Digital & DTS multichannel audio and should therefore be compatible with your 5.1 receiver. It also includes an AV Input port and corresponding adapter for RCA cables. I just purchased this TV and haven't yet connected it to my 5.1 receiver, but will correct this response in the off-chance that any problems arise.
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