Hey George,  First I have to say if you get the chance to cryo your equipment run don't walk! 

  The Radials to me are truly magical at volumes of 90db or lower.  I don't think there is a speaker that can beat them.  
I am going over to a friends house hopfully today with my amps and DAC ( Dodson 2 1 8 ) and we are going to hook them up to is K-Honrs.  This will be the final comparison for me.  I may find the horns to sound bad after listening to the Radials for a month now ???  But you know how it is I remember all the good things the K-honrs did and probably have forgotten the bad points.  
For 90% of my listening the Radials are GREAT,  the only issue I have is when I what to hit the volume, turn my amps to 11 (spinal tap) LOL  IMHO the speakers fade quickly 

Bob Z has spent a lot of time with me on the phone (thank you Bob) and we have talked about adding a WO or WO32 to releave the Radials at about 50 hz but I am starting to think that would be a waste.  They sound wonderful down to about oh I would guess 35 hz, as long as you don't turn them up to high.
Audio is a journey thats for sure and we all take different paths.  The most important thing is that we enjoy our journeys.  I will report back once I have heard the K-horns again.  All the best, Guy