Bel Canto Black EX Integrated vs. E1X Integrated

Don't know but I can say even the modest C5i sounds wonderful though only 60 w/ch and separate streamer required. 

I’m very much wondering the same!

And then there’s a third one: the Black for over $30,000! The rear panel on all three is identical. I’ve listened to the E1X and it sounds fantastic. As far as I can tell, the main difference is in power output, but I would love to hear others’ thoughts.