Summary: Many audiophiles bewail the so-called horn sound of horn loaded speakers. I cant speak for other horn loaded speakers (not that there are that many others) but these simply do not have the so called horn sound. They are very efficient and may have you reaching for the volume knob sooner than other speakers but the quality of sound will match any of the other highly touted brands like B+W or Magnepan. This is particularly true when one factors in the size of this speaker.
Summary: I own a few pair of Klipsch Heritage speakers and I've always used the Heresy as a center channel. I have K-Horns, Chorus II's, Forte II's, Cornwall II's and Quartets, so I'm a bit familiar with the limitations. The bass roll off on these speakers is somewhere between 50 - 58 Hz, the material of the cabinet is irrelevant, it's the less than 2.0 cubic feet of cabinet volume that gives them the high roll off.
Summary: the heresy has a horn tweeter and a horn midrange driver...the woofer is a 12 inch acoustic suspension driver..a true horn loaded loudspeaker will have a horn loaded woofer....the heresy does not. I know it is hand built in Kentucky but 1700 bucks is still a bit much for a pair of speakers! The klipschorn is a true horn loaded loudspeaker...the heresy is still a great speaker..Paul Klipsch was a true audio pioneer!
Summary: I gave the Heresy high marks for features because it offers two sets of connections for biamping, a magnetically attached grill and a nice base that tilts the speakers up. Biamping is using two different amps to drive the speakers, one to the low end and another for mids & highs. The two sets of speaker inputs are connected via metal strips. You want to leave these in place for regular use. They will be removed when biamping so each amp gets it's designated connection.
Summary: The Heresy III is a truly amazing little speaker, I use thrm for everything from Bolero to the movie XXX ( I like Vin Diesel movie) Although the lower limit id 58 Hz, everything is crisp and clear. These little guys provide tremendous sound ifromr really small floor standing speaker, Hmm...very efficient, very high quality, great tonality, kind of expensive...all in all it is a Kliosch Heitage Soeaker.