Well, in the main it's the SUPERB vocal realism that you only really get from head sized loudspeakers that use thin-wall (9mm) birch plywood construction.

Virtually ALL larger speakers with big frontal areas (baffles) cannot produce human voice (or natural instruments) with the same tonal balance and near holographic central imaging.

When you hear a good LS3/5a system for the first time (usually driven by expensive high quality tube amps), there is a spooky sense of the vocalist/instrument player actually being there - in between the speakers. It's a solid tangible thing that on the very best LS3/5a systems defies belief.

OK, the bass is nothing special - accurate but not a lot of it TBH, because it's an ancient KEF design bass/mid unit (only 4" / 100mm diameter), in a ONE LITRE sealed box............but the overall ballance/voicing of the LS3/5a has stood the test of time and many wanna-be LS3/5a's have come and gone.

The real bonus is new/younger customers discovering this very natural sound and enjoying their collections of LP's/CD's properly for the first time.