changing the direction of this question based on understanding what I’m looking for more clearly.
I’m trying to find the best way to play 2 channel audio from my home theater through my headphones.
My first thought was to find a simple box that takes an HDMI input, decodes the surround sound audio, downmixes correctly to 2 channel audio, and outputs to either optical or coax. And also outputs the corresponding video over HDMI (preferably in sync with the audio ). Not just an HDMI audio extractor, but correctly downmixes the surround sound audio to 2 channel audio.
Any thoughts or recommendations?
I found this one: JTECH-H2DM
It looks good, but it’s not for sale anywhere.