And reported on it while still in chock ... I read your post and felt a bit envious.
BTW, Paul Stublebine described the system in the Tapeproject forum after I asked about it. His own words:
" The Magico is a four way system. It's from the time before Alon was making his own drivers, so it uses commercially available units. The bass, mid-bass and midrange are Focal cone drivers. The tweeter is an Aurum Cantus ribbon. I decided from the beginning to quad-amp it. Dan and PJ took a Marchand crossover and totally re-engineered it. Now of course it has the current-sourced active loads everywhere, plus they redesigned the filters and chose different tubes as needed for each part of the circuit.
The amps were designed and built by eXemplar, and have now been modified and rebuilt by Bottlehead for better sound, more consistency and higher reliability. The bass, mid-bass and midrange amps are differential 300B's. The tweeter is powered by a single ended 45. All amps use Magnequest iron. It's all connected with First Impression Music cables: power, interconnect, and speaker cables.
Besides the gear itself, there are two other stories: the acoustic design of the room, and the extensive tweaking of the system in place. These are longer stories than I want to detail here...I just mention them because those aspects are of equal importance to the final result. The tweaking in place is now being repeated for the system in its new location in my living room.
I don't recommend such a complicated approach for anyone else. But I wanted to push a certain idea to its limits, and I felt I had the resources available to do it. It took a lot of work to dial it in initially, and it takes quite a bit of work on an ongoing basis to keep it operating at peak performance."