Coherence first: all frequencies come from similar technologies. I can't abide a speaker which presents a piano's top octave one way, and the bottom octave another. ESL's have coherence, Magnepan used to.
Fast: ESL's are the classic. Also ribbons and other planars, plasma.
Undistorted: most speakers use crossovers which could have been scavenged from a dump. It shows, or, more precisely, it sounds that way.
Fast: ESL's are the classic. Also ribbons and other planars, plasma.
Undistorted: most speakers use crossovers which could have been scavenged from a dump. It shows, or, more precisely, it sounds that way.