The older red-headed stepchild nobody probably wants to deal with anymore is Rectilinear. I felt they had a similar sound to ADS and I hold them in a similarly high regard -probably less articulate but with possibly better tone. I would put the German Braun/ADS company into the "East-Coast" acoustic suspension type of sound signature. The Rec's of course all need a crossover recap (or more) to sound their best at this point though -then again, who doesn't? Tossing those tired old cement resistors in favor of non-inductive wirewound types never hurt either.