Believe it or not, it can happen again. I upgraded from a pair of DT990 pros to the Drop + DCA Aeon X opens a few days ago, and I've just been listening to hours and hours of music since then. It's not as big an upgrade, to the Beyerdynamics' credit, they get you like 90-95 percent of the way to where the Aeons are, but that little bit makes a lot of difference. Now I'm investigating the idea of getting a modest dac/amp with a balanced output, to see if I can hear anything new.