If you are using a dedicated player like the Zidoo Z9X Pro or Dune HD Homatics Box R 4K Plus, you are in a good position for high-fidelity playback.
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Zidoo Settings: Go to Quick Settings > Audio. Set HDMI Audio to RAW. This ensures the player does zero processing and sends the raw 96kHz/TrueHD data to your AVR.
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Dune HD Settings: In the Dune Media Center app, ensure "Audio Connector" is set to HDMI and "HDMI Audio" is set to Bitstream.
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Playback Tip: These devices are excellent at handling "Match Frame Rate," which prevents the subtle "stutter" sometimes seen in 4K visuals on less powerful hardware.