ESL57 vs ESL63

@clio09, Though the OB/Dipole Sub uses the Rythmik A370 plate amp/Servo-Feedback woofer system and is sold by Brian Ding on the Rythmik website, the design is more Danny Richie's (of GR Research) baby than Brian's. Danny was already making an OB/Dipole when he heard about Brian's new Servo-Feedback design, and contacted him, thinking the combination of OB and S-F would produce a new standard in bass reproduction. Owners of the sub agree!

Brian Ding, though appreciating it's abilities, finds the OB/Dipole a little too lean sounding, without the weight and room-pressurizing he likes to hear in a sub. All the enthusiasm for the sub originates with Danny, and the best discussion about it appears on the GR Research AudioCircle Forum rather than the Rythmik AVS one.

"the 57’s need a fair bit of SS power"?! The 57 was designed to be run with the QUAD amp, which produced 15 watts/ch. One solid state amp which became very popular with the 57 was the Bedini 25/25 (guess how much power it produced ;-), which was capable of overpowering the speaker. As clio said, the Music Reference RM-10 is an ideal amp for the 57, especially the Class-A 25w/ch version.

Add subs for below 40-60Hz and be happy forever. Unless you’re cd318 ;-) . The speaker is not for everyone---you have to be able to appreciate it’s abilities, nor for all music---I wouldn’t try to play AC/DC at 100dB (which I like to do) on them. But for singers and small-scale acoustic music? Perhaps still unsurpassed, and yes, better than the 63, regardless of what Peter Walker thought. But take off those idiotic metal grills!