Have not heard the IV but I owned the Cornwall III and I could NOT find a way to like them. The cabinet resonances obliterated detail in the midrange that I just could not live with. My Forte IIs also do this but to a much lesser extent. I did like my Heresy IIIs. Probably the worst in the way of cabinet resonances was my Belles. It seems the big Klipsch really have a problem with the damned boxes singing along with the music,
