ESL57 vs ESL63

I have the 57s but have spent some significant time with the 63s as well. Overall I prefer the 57s, but I use a set of stands to raise them up a bit to improve the image height. While I use a woofer array and active crossover to biamp in my system, the 57s on their own do bass much better than I expected. They aren't going to go much below 40 Hz but what is there is pleasing. I play a wide variety of music with them including rock.

Mine have the clamp boards installed which means I can use just about any amp with greater than 20 watts power and not have to worry about arcing the speakers. It's a worthwhile upgrade if you purchase a pair without them. I either use Atma-Sphere M60s or a Music Reference RM-10 on the 57s. Both amps work quite well with the speakers.

Gradient made dipole subs for the ESL 63. Here is an article from Robert E. Greene discussing the set up:

http://www.regonaudio.com/Gradient%20SW-63%20Subwoofer.html

@bdp24, interesting I didn't know that about the 57s. I will look into the Rhythmik subs.