See the 3 part KC II Pro audio review at:
The KC II Pro is an upgraded version of the KC II. It uses our state of the art Neo Polyester tweeter from the top of the line EP2.8 and EP4.8 speakers. This tweeter offers amazing resolution, increased transparency and even greater dynamics compared to the standard KC II tweeter. In addition, the Pro uses an upgraded Special Edition crossover with higher quality parts. Finally, it comes with an nicer upgraded $600.00 finish and our $500.00 BOM 4-pole Linkwitz Transform Function analog EQ to extend the bass response to 35Hz.