I have both the 57 (although they are moldering in my basement) and the 63 (a Crosby modded pair), and let me tell you, to paraphrase something similar, I know the 57 and the 63 (even Crosby modded) ain't no 57.
THe 63 will play deeper, louder, is more dynamic and less beamy, but it is not as coherent as the 57. That said, the 57 does suffer from severe limitations. It is, though, so spot on with what it does right that it often makes you forget that it is like a painting in miniature. I have promised myself to get mine restored, and would love to try them with my Lamm ML 2s and my current front end, which is slightly more resolving than my turntable/preamp/amp system from the early seventies.
THe 63 will play deeper, louder, is more dynamic and less beamy, but it is not as coherent as the 57. That said, the 57 does suffer from severe limitations. It is, though, so spot on with what it does right that it often makes you forget that it is like a painting in miniature. I have promised myself to get mine restored, and would love to try them with my Lamm ML 2s and my current front end, which is slightly more resolving than my turntable/preamp/amp system from the early seventies.