It is absolutely an improvement over my D2000, but not drastically so. Not really a big improvement on the "fun factor" of the Denon. They share a similar overall sound, with the TH-900 being a good deal more refined and detailed. Again, "cleaner and clearer" come to mind when comparing it to the D2000. That's really what I've noticed in my first few hours listening.
If you are after a more fun sound you might be better off investing in dacs and amps to bring more fun to the party. Maybe vintage amps could help?
Edited by Audio Jester - 6/27/14 at 10:08pm