Well heres teh problem : to start with , they are used , as far as i understand , the guy im buying from bought from his friend so gotta be at least 2-3 years old i guess. 2nd - I have no guarantee that it is undamaged and no way of telling the low performance if there is since this is first headphone. He says chipped paint , is it normal ? Also , although idk the difference , the picture looks like its the old HD650 without the white layer behind the grills (? right word ? ) . Also , people say that after 598 , they are all good and not much difference between 598 and 650 . Is it true ? If that so i plan on getting the 598 because 650s look hideous , and the one im planning to buy doesnt seem safe .Also , 598s look very nice and i hear the yare light and that they do not have any physical defects other than being fragile . So , what do you think ? I s the sound quality worth it considering these ?
The HD650 is a phenomenal headphone, but comparing it to the 598 isn't fair. They are two completely different cans and their sound in comparison to each other couldn't be more different.. The 598 is extremely light weight, but as long as it is not mishandled, it will hold up just as well as any headphone out there, despite how fragile it feels. Just don't throw it around and it'll last a long time. The 650s build quality, by comparison, is like a tank. Very solid, premium plastics are used throughout the entirety of its construction.
The 598 I had (I sold them to a Marine friend of mine) sounded very grainy, but not unpleasantly so, with a fairly large soundstage, tight bass (but no sub bass), slightly sibilant highs (at times), and a very nice midrange. When wearing them to watch movies they gave me a kinda cinematic feel, but without the full "wow factor" or "fun" sound that you would get from more bass heavy headphones. For music, they performed well, in my opinion, across all genres that I listen to (smooth jazz, R&B, Blues, Rap, EDM, classic rock, alternative rock, and some classical), though they certainly weren't the best and where they were lacking was glaringly obvious. All in all, I thoroughly enjoyed them while I had them.
The 650 by comparison is a much darker headphone, with a deeper (not wider) and taller soundstage, better separation in regards to instruments and vocals from the rest of the music, and a definite bass boost that provides some of the best bass (without reaching summit-fi prices) I've ever heard on an open headphone. The highs are very smooth. They were never sibilant or fatiguing, and I absolutely LOVED them and used them for EVERYTHING. This version of the 650 I'm talking about has the white driver that you mentioned. I'm not sure what, or if, there really is any difference between the 2.
If you really plan on getting the 650 over the 598, If I were in your shoes and unsure about the purchase, I would buy a new one or go for the 598 instead. I wouldn't buy a used 650 from anyone outside of the classifieds here. The only other exception would be if I was buying B stock or a demo unit from an authorized Sennheiser Dealer.