The best speaker system I ever heard was the Wilson Audio WAMMs, years ago. They could reproduce the dynamics of a full-scale orchestra and still present a close approximation of the sound of real instruments.
But, the top of the line Soundlabs I've heard recently (Ultimate-1s, I think) are better at capturing the nuance of detail and the size and shape of the "acoustic image" of a real instrument's sound and are the best I know of, now, especially at anything other than ear-splittingly loud levels.
But, the top of the line Soundlabs I've heard recently (Ultimate-1s, I think) are better at capturing the nuance of detail and the size and shape of the "acoustic image" of a real instrument's sound and are the best I know of, now, especially at anything other than ear-splittingly loud levels.