Hello Michael and Troels, 
I was up until 12:20 last night and up again at 5:50 this morning - just so I could finish the crossover install before a family (ie: very little audio) Easter weekend. It was worth the lack of sleep!
I'm not sure how describe it, but the new Xovers are like removing a thick veil from the speakers. In fact, there is now no sense of 'sound', simply the music, in all its harmonic and dynamic richness.
(I can't believe the old crossovers had such a untidy sonic signature - and the caps within had been replaced with Soren caps, too.)
I finished converting one speaker last night and could then A-B left channel with right using a mono signal via Roon. The difference was so stunning that I couldn't sleep, in anticipation of completing the second speaker!
Thank you to both of you, for making such a stunning upgrade possible. I shall be forever grateful. 
(By the way, I still have a quarter tube of Superfix left!)
With kind regards,
Nick