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Hi ZJake. The Optical Digital Audio Out is used to send digital audio signals between devices. The Optical Digital Audio Output on the LG UHD 85 Series 65 inch Class 4K Smart UHD TV with AI ThinQ® (64.5'' Diag), Model # 65UN8500PUI supports uncompressed PCM stereo audio, and 5.1/7.1 Dolby Digital and DTS multichannel audio for people with surround sound systems...^IFV
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