I was a 2-channel guy long before "surround" was ever heard of. And even when I built this theater, I chose to put the left and right speaker in the room (and hide everything else), to allow me to listen to 2-channel and get the best imaging.
Over the last 5 to 10 years, I have experimented with all kinds of surround modes to "enhance" 2 channel listening, most recently Dolby DSU and DTS:Neural-X (and a previous implementation of AuroMatic on another less excellent processor), and while many of them have been "fun", none have worked for long term music listening. The material that was sent to the heights and surrounds was not appropriate and/or trims set to high and/or ??????
I have never been a fan of Auro, but I have finally found a mode that works and that is AuroMatic BUT
with some important modifications to the settings.
I noticed that when I listened to the standard AuroMatic the bass seemed far too excessive, bloated, much less well defined. And when I compared it to just 2 channel, it was clear that was the case. I assumed that AuroMatic was sending what it captured from the left and right channels to every other channel. So, I told the system that every channel but the left and right were full range and used the Dirac filter description for each channel to act as a high pass filter. Problem solved. I have never heard music of any kind sound this "real" or "live" or whatever descriptor you would like to use. I have had to adjust the Auro "strength" setting to get it to sound less "fake".
I had a friend over the other day to listen. He is a 2 channel "bigot"
and has one of the very best (and most costly) 2 channel systems I have ever heard. Even he was amazed at how much better it sounded than just 2-channel. He had heard some of my other attempts and was not impressed.
If you choose to give this a go, and you decide to switch back and forth between no upmixing and Auro, you will have to adjust the volume as the AuroMatic version is about 3+dB hot.
I have never enjoyed listening to music this much. While some kinds of music and/or venues in which it is recorded sound better than others, ALL of it is far superior to plain ol' 2-channel and none of it sounds "manufactured" or "synthetic".
I love what the Datasat provides in terms of great hardware, and great functionality and its implementation of Dirac and Auro. Most excellent.