Vandersteen 1C: dark, muddy, and the vertical dispersion pattern was ridiculous. It had some good qualities, but I could get over these problems that I heard immediately.
NHT SuperOne: The highs were just rough, crude and a little harsh, comparing them to newer speakers with metal tweeters. Also, they had decent bass, but even using them in a bedroom at moderate levels, crossing over to a subwoofer made the midrange significantly cleaner, so the bass they produced wasn't really useful.