Heya, up for sale today is my Sony MDR-7509's. (Not to be confused with the 7506's or 7509HD's!)
These are a really interesting (and nice!) sounding headphone. They easily have the best extension I've heard in a Sony headphone (both bass and treble extend very well), and in that regard they even best my CD900ST's. Bass is a little emphasized, but is very articulate. Similarly, the treble, particularly the upper regions of it, have a little bit of emphasis, but I never found them to be harsh. Certainly not compared to my ZX700's. Mids are also very nice. The mids are very warm, but not too lazy or foggy sounding, and they aren't recessed at all. (Which, often times, when a person uses "warm" to describe mids, that is what they mean.) They also have a very large soundstage, probably the biggest I've heard in a closed headphone. Overall, they are practically the exact opposite of the V6's, and brought a number of large improvements to them.
So, anyway, as for their condition, they are a little rough. They aren't broken, or cracked, or scratched or anything of the sort, but this headphone has seen a lot of use. It's just a lot of little signs of use they have collected over the years. The pads are beginning to flake, but are otherwise in good condition. (To be honest, most of the visual wear is on the stickers, and most folks just end up taking those off anyway. I haven't, but if I did, I think they would seem a lot less used.)
This model has since been discontinued in favor of the MDR-7509HD's, which I'm told, sound totally different. I'm not sure how rare they are, but prior to getting these, I had never heard of the non-HD 7509's.
I'm selling these to fund a computer upgrade.
Edited by Kukuk - 10/15/12 at 7:14pm