If you are using a receiver or surround processor for both audio and video processing, you would use just one of those HDMI outputs. If, on the other hand, you have a separate video processor (as a fair number of people do have) then you run into a problem: HDMI has lumped audio and video into a single cable, and you need to send the audio and video to separate devices. That is why Marantz and Denon have provided two HDMI outputs on their flagship BD players. It allows the audio to go to a surround receiver or processor and the video to go to a standalone video processor.
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