I took my Dali Epicon 6 speakers to a stereo shop today but only ended up demoing one of my speakers vs. one Aerial Acoustic 9, mono a mono

...full Bryston power setup, including the preamp with balance control, which allowed him to instantly switch back and forth between speakers.
To my uneducated ear, the Aerial speaker projected a fuller sound, with a bit more but not a lot more bass than my Dali speaker. The Dali was perhaps a bit cleaner sounding.
Bottom line, my room, at least with the speakers placed where they are--the only place I can put them, is a bass killer.
So I will buy a sub from this dealer and have them optimize the placement and calibrate it correctly...I am hoping that one will do...
Aside from Aerial, they also carry Paradigm and Velodyne. They are recommending the Aerial SW 12 sub as the best solution, in part because the Aerial has a dual crossover configuration that will allow it to meld with my Dalis better (just quoting the dealer) than the Paradigm S1 or the Velodyne Digital Drive 15+, which do not have dual crossovers??? I think I will try another post on this topic.