I'm in love. Just got a pair of second hand 650's (I paid 238,5EUR which I think is OK, not the deal of the year, though).
These sound so good. I'm upgrading from ATH-AD700's which I've had for 3 years now and sounded lovely for the 70EUR that I paid by the way. First got second hand DT880's which seem the supreme analytic 'phones but got very tiring pretty quickly. Kept them as monitor phones. Also tried AKG 702's but they were uncomfortable and pre-burn in sounded horrid. It felt like the natural upgrade since they boast an immersive sound stage à la AD700, but I just didn't like them. I should listen to a pair that's properly burn-in some time.
These Senn's are just a tad less comfortable than the AD700's but I'm sure they'll be BETTER once I get used to them, since these are small enough to use in bed and to sleep with.
Yes, to sleep with. These are absolutely fatigue-less to my ears, while sounding overwhelmingly good.
One weird thing, I have a dedicated amp (burson HA-160) but feel it is a bit of a waste. I think the sound out of my ipod sounds fine. SUCH HERESY!! No, really, it's a nice laid-back and relaxing sound to my ears, no veil with the 650. If anything, the worthless ipod DAC makes the sound even more laid-back. Well, I'll be using the Burson while on my desktop PC for some extra kick & while playing the piano for extra drive.
(Coincidentally both the AD700 and the Senn 650 are both very high in the Headphones Top List, so the list sure is accurate to me).
Unless Sennheiser reveals a new totally laid-back and not too bright sounding upgrade over the HD650, I doubt I'm buying new headphones any time soon. If ever. These really diserve the #3 place in the headphones listing on head-fi. Superb.
Edited by Baten - 10/10/12 at 11:54am