Thanks for that. I suppose if I could afford the 009 Stax I would probably use them for classical too
Lately, I've been getting into some older recordings, and realize that not all the changes in the big picture of the classical music industry are positive. While we have more high quality recordings than ever, the performances themselves are often lacking a sense of the grandiosity of classical music performed back when people listened to classical music mainly because it reached their emotions. So, the HD650 actually works well for me in many instances where more analytical cans can peer too deeply into the recording itself at times.
I agree though that the spacial presentation is not as masterful as it could be on the HD650, even with very good upper mid-fi gear. The other cans I use a lot are the Beyer DT150, which have a slightly cleaner presentation than the HD650 with a little bit more sparkle in the high end. But you need a good amp for them to sound even close to bass-neutral, in my view. Ironically, even though they're closed cans, they have a wider soundstage than the HD650. When I really need space, though, I go for my AKG K501, which is great for classical, as long as you don't need any sub-bass.
Granted all these cans are $200-$500, and one can probably do better in the $600-$1500 range. That said, I am a believer in finding good mid-fi cans and then getting good gear to see how they can go.