When you are talking about upmix, what is it and how to enable it? When I listen to music, my "Music scene" is in Straight mode so stereo is stereo and Atmos is Atmos (I listen to a Clapton recent album until the end, found it really well mixe, then realized it was actually Atmos all the time, so my "music should be stereo" mindset is slowly evolving to a more open mindset). Is there a way to have a stereo input and to get something upmixed to Atmos ? By selecting a specific DSP program ? Yes. DSU(dolby surround) or DTSnx(DTS neuralX)will. DSU is better for music imo.