Krell KBX crossover.


I was doing some reading on the Krell KBX crossover and was really interested in finding one for my speakers which are B&W Matrix 800s. I am running a Krell FPB 600 with Krell B&W baf ( bass alignment filters, balanced). ARC Ref 6. Are the Krell KBX only used when bi or tri amping? Also what sonic advantages would the KBX bring to my speakers. Thanks in advance. 
128x128Ag insider logo xs@2xtattooedtrackman
I also have the BAF’s and I have been hunting for a KBX for the B&W’s for about 6 years, no luck yet.....

Is there anyone who knows how to change the MID crossover of the B&W Matrix 800 when use it with the Krell KBX? There must be an instruction manual from Dan D'Agostino ( Dan's white paper ).
Thanks in advance!
Seems to be 2 way stereo or 3 way mono.
Lovely build if it were 24db slope I could give the resistors to change, unfortunately looking/reading this it’s only 12db slope
https://www.diyaudio.com/forums/analog-line-level/332312-krell-kbx-crossover-info.html

Cheers George