Pharmaboy
Headphoneus Supremus
I loved the sound of the stock HD650 from note-1 (didn't care much for the comfort, but I've had worse, too). I could easily hear why that headphone became a classic.My 650 don’t sound dark and veiled, they are just a tad warm with smooth treble. I’ve heard there are a lot of unit variations with 6XX though leading to some sounding not great at all.
The worst things I could say about the HD650 were that the soundstaging is "intimate" rather than expansive (but that's actually ideal for what was designed to be a monitoring headphone); and the very bottom Hz of the bass are MIA (many other headphones are the same).
Didn't like much of what I read about the HD6XX. Sounded like the "improvements" in its voicing could be problematic, though I never heard one to verify for myself.