I'll chime in here. I have a couple of pairs of ESL 57s and a pair of USA monitors. The 63 does not even come close to the transparency of the 57. The 63 is easier to place for a forgiving centre image, plays louder and deeper so might be a more suited for modern musical fare.
Even at the age of 8 or so my son identified that the 57's sounded "more clear"... The frustrating thing about the ESLs are they sound small and don't play particularly loud. The bass is very good contrary to popular belief ,particularly, if the panels have been refurbished by Wayne Piquet.
It's difficult to give up what the ESLs do .. I've been looking for several years and can't narrow down a replacement without sacrificing what the quad's do well.
Nkj
Even at the age of 8 or so my son identified that the 57's sounded "more clear"... The frustrating thing about the ESLs are they sound small and don't play particularly loud. The bass is very good contrary to popular belief ,particularly, if the panels have been refurbished by Wayne Piquet.
It's difficult to give up what the ESLs do .. I've been looking for several years and can't narrow down a replacement without sacrificing what the quad's do well.
Nkj