The very best example of imagery that I ever heard was during an audition of a Quad ESL. The baritone sounded palpably three dimensional between the speakers.I think that your experience with the Quad was probably less caused by the pairing with your amplifier than room acoustic....
So of course I had to buy them.
However my experiences at home were not so good (I later learned on here that my Naim amps were not the best match - the seller was using Quad amps, valve I think).
Still, I have to admit that no speaker that I’ve heard since (>25 years ago) has been able to recreate such ’reach out and touch’ imagery as those Quads did.
I own average good speakers Mission Cyrus 781 and what you described i never have it with my speakers BEFORE my acoustical controls installation...
After that their imaging,3-d holography and listener envelopment factor by 100%...
Acoustic controls is the most powerful upgrade anyone could do...