RickB
Headphoneus Supremus
That means that anything less than perfectly recorded is going to sound like schiit. I had to be extremely careful with my music collection.
HD650 is obviously more forgiving headphone, but too compromised on the treble, IMO.
I listen to a lot of indie music that is often poorly recorded or mastered. Some of it actually sounds better from my iPhone with PX-100-ii than on my desktop system with HD600.