The difference is minute overall, but I'm able to A/B them due to my SA-31 having two 1/4" inputs. Perhaps it's 'burn in' too? Not that I believe in it, but maybe if the new one has as much time as I put on the old one, it will sound closer to it.
In any case, it's still solid. Just a very minor difference, except the bass being definitely stronger. That $70 back in my pocket outweighs the difference in sound, and I do want the bass on the new one.
It could also be a slight ohm variation, making the old one a little louder than the new one at the same volume setting on my amp. Slightly louder would make one perceive more clarity, so it's possible. The new one is more fun, without a doubt.
BTW, my HD650 finally shipped. E-E must be back on it's feet after Hurricane Sandy. NJ got hit hard, so I wasn't expecting them to be shipped anytime soon.
Edited by Mad Lust Envy - 11/1/12 at 10:34am