I bought my Trinnov as an indulgence because I had played around with Atmos using a Marantz SR7013 and I liked the results so wanted more and better. In fact, I have somewhat tired of Atmos as I notice sound (beyond 5.1 or7.1) much less when my mind is on watching a film than just listening to music.
The very pleasing and unexpected result of the Trinnov has been how much it has improved the sound (music) experience I get from my Meridian speakers compared with the 861v8 I was using previously. I was really surprised at how much better the Trinnov is for music.
I don't think (except briefly) about the wizardry that is going on to lift the lid, so to speak, on my listening room, and I know it is absolutely not for purists, but the effect takes me into performance spaces, aurally speaking, that I have not otherwise achieved at home.
I believe phase is everything when it comes to listening (we do have two ears after all) and the problem for most of us (who don't have our own concert hall) is the unrealistic size/timing (phase) of the reflections and absorptions our rooms inflict on us. Trinnov seem to have found a way to compensate, at least a little bit, for this and the inherent accuracy of Meridian's speakers respond well to the signals they receive.
That’s interesting you find the Trinnov better for music than the 861v8. I’ve heard good things about them (the room correction in particular) but not heard one (little point as way beyond my budget right now).
Agreed re: phase. Think it could be another aspect of why I find Trifield so pleasing, since it processes phase signals differently to straight stereo, iirc?
Also the subwoofer link I posted above goes into much detail on phase and its importance (and how allegedly almost everyone implements subs wrong in this regard) which I found very interesting.