John
Rack’em Up!
I'm surprised the ESL57s have received as many mentions as "best ever heard." I had a OneThing refurbished pair on home trial to see what the fuss was about. While they were pleasant enough to listen to I kept wanting to turn the volume up to get some substance to the sound which of course is not possible without damaging the speakers.
The fabled mid-range was very good it's true but not that much ahead of the EposES14s I had at the time and which on balance I preferred.
You must listen at much louder volumes than I do or you were not aware they’re not as delicate as you thought. Wanting to turn up a loudspeaker to me is a good thing, a sign you’re enjoying them. What dB level were you trying to achieve? Don’t all One Thing modded Quads have clamping boards, makes them indestructible.