[callagg2]

I was wrong, the sound of the HD TV channels does work on Dvb-s2, the issue was the default settings.
If you open Advanced Settings, then Audio Output, and change "Dolby Audio Format" from "PCM" to either "SPDIF" or "Auto" the sound works fine. 

I see Mecool have now sorted out their Netflix Certification (not for my box though) 
 https://www.mecoolonline.com/blogs/news/mecool-netflix-certified-android-tv-box-km2-giveaway