Ensure you are using certified HDMI 2.1 cables. Older HDMI 1.4 or basic 2.0 lines lack the bandwidth required for combined 4K@60Hz video and uncompressed Dolby Atmos audio.
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Thankfully, there is no shortage of safe, legal, and often affordable alternatives to HDHub4u that allow you to enjoy movies and shows without any of the associated risks. Ensure you are using certified HDMI 2