What I think you're speaking of is what I call immediacy, this is what I'd describe as sense of performers in room. First time I heard this was with my first 845 SET amp some years ago. But it was only after hearing my 845, 300B SET's with stock Klipshcorns this sense was heightened to the point I knew somehow I had to keep Klipshorns.
And so, in spite of sound quality defects I heard with the Klipschorns vs. previous speakers, I proceeded to modify the Klipschorns to my liking. On to today, my Klipschorns deliver this immediacy without prior defects. Other wonderful aspects of my horns (and stock Klipschorns) include extremely high resolution, without this one can't hear that sense of real live performers in room. Microdynamics, also allied to resolution, but which is as much a function of other equipment in system; horns can expose this ability to it's fullest.
Part of what allows this performance is minimalist crossovers in horns, which helps to create high efficiency, which in turn allows minimalist amps such as SET. Much less stands between source and what comes out of speaker.
The above qualities, in concert allow engagement with real live performers in room with every listening session. My horns are the final solution for speakers in my quest for end game system.
Sounds like you're obtaining similar engagement with your horns, you get the magic of horns.