got a pair of aurum cantus here, for in the midrange d'appollito frankenstein monitors I'm nearly finishing. I'll report if that is some success. these chassis have the folded membrame just like the adam, and should have a simular result.
I'm not sure about the choice of midrange chassis. I was going for a pair of paper or titanium domes but I don't know anymore. They need to be fast, and precise to keep up with the tweeters. ATCs I will buy when I win the lottery, next weekend.