Most harsh/shrill sounding speakers (vintage)

Aside from the Yamaha NS-10M Studio Monitor, what are the worst sounding speakers that can make your ears bleed and provoke listening fatigue instantly even at a reasonably low volume. Speakers that are too bright, too snappy, too "honest", y'know, speakers that just sound like crap. The worst sounding speakers ever, if there is anything worst than the Yamaha NS-10.