quad els 57

i have a modified pair of quad els 57 by a company called lindley allen. all i know about them is that they are extremely rare and there are not very many pairs in existance. Oh, the other thing i know about them is they are the best speakers i have ever heard. I do not listen to classical music and these speakers do things that they are not supposed to be able to do. Does amy one know anything about them? Thanks for your help in anticipation, iain