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4K 5.1 Optical Audio Splitter Adapter USB Switch Splitter Support for HDTV Switcher Adapter for Windows PC - AliExpress
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Amazon.com: Sound Card,Optimal Shop 6 Channel External Sound Card USB 2.0 External 5.1 Surround Sound Optical S/PDIF Audio Sound Card Adapter for PC Laptop Recording Compatible with Windows 10/8/7/ XP : Electronics
Can HDMI output give 5.1 surround effect or can just an S/PDIF give the exact surround in a home theatre? - Quora
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