Why Do Some HDMI Passthrough Ports Not Process Audio, Only Video?

tyreal78

tyreal78

Junior Audioholic
I'm just curious why some HDMI passthrough ports only process video and not audio. And more importantly, how can you tell this is the case when shopping around?
 
If the receiver is described as an HDMI "Repeater" it can pull audio. If it s a "Switcher" then it merely passes along the HDMI to the next device. It is more expensive to manufacture a product that fundtions as a repeater and decodes the audio. Your lower end receivers will switch HDMI (garbage in, garbage out) while your mid-fi and upper models will be able to play back audio.
 

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