About a year ago I bought my KC IIs and paid extra to have them upgraded to include WireWorld OCC internal wiring and upgraded caps in the XO. IMHO they are one of the very best bargains in hi-end speakers
Since then my system has been slowly, but now completely upgraded. Each and every step was easy to hear
They play all types of music extremely well. Since my room is 19 x 38 X 11, I also incorporated 2 SVS subs to flesh out their tonal ability
Eventually I would like to own the 2.8 carbon, which should eliminate the need for subs, even in my large room
A long time ago they stopped using Behringer XOs., and are available with passive XO or DSP