The Aeon X closed back by Drop and Dan Clark Audio. Seriously I wasn't expecting them to be as good as they are when I first put them on. I personally find that they have very detailed sound, and I like that they handle sub bass with the same oomph that they handle highs with. Coming from experience with HD650s, I knew they'd have a different sound but I'm still blown away, I know they aren't considered endgame to most but after I get my Stax I think I'll actually be satisfied. I'm sure my headphone collection will continue to grow but I don't feel the need to go more "endgame" then these, truly the best audio experience I've personally had. (Besides Stax lambdas, I'll be having those thanks)