MX HDMI Male to HDMI Male 2.0V High Speed Cable 30 AWG. (50 Meter) Gold Plated 19 Pin Supports 4K@30Hz, 2160p, 1080p & 3D and Audio Return for TV, Laptop, PC, Monitor
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How to connect HDMI output audio to a 5.1 surround speaker which has 2 channel RCA input - Quora