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And "assuming" your 4k TV is capable of decoding Dolby Audio 5.1, what and how are you passing this to, to get 5.1 ?  Optical afterwards from TV to a sound bar/receiver ? 

And on your TV, what is your HDMI Audio input format set to ?  PCM or BitStream ?  If it is PCM, it assumes that the signal is already processed, and it will just output it from the TV speakers.  If it is set to Bitstream, the TV will try to process it.

There are many variables, and they all need to match in order to get what you are looking for.   Typically people looking for Dolby multichannel Audio plug the box direct into a receiver which will handle that and then pass the video signal to the TV.  If you are doing it the opposite way around, there are many restrictions.  

Even Samsung themselves warn about that.

"Note: Even though HDMI is capable of carrying a 5.1 audio signal, HDCP (High Bandwidth Digital Content Protection) keeps the TV from passing decoded 5.1 audio content from the HDMI input to the optical output. Because of this, 5.1 audio output from optical is not available when using the HDMI input."

Source: https://www.samsung.com/us/support/troubleshooting/TSG01109021/

Just saying...



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Read the italic quoted section of my post, which is a link directly from Samsung. 

Does you receiver have HDMI in ?  Can you go from box, to Receiver direct HDMI, and then from Receiver out to TV ?  That way the receiver handles all decoding.


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