My 3.6R cross over to the ribbon @ 1.800 Hz IIRC. The Apogee full-ribbon speakers still have some followers who swear they still sound excellent albeit they are very difficult to drive properly. Would be interesting to have ribbon cans too. Or are there ribbon headphones already on the market?
I seem to remember that Mark Levinson designed his original amp for the big Apogees. But I could be wrong.
Best regards, Jörg.
I had Apogee Stages for a few years in the 90s. A really live sound.