
I've just got them. To me the sound is great (of course, I've listened to crappy computer speakers for 2 weeks now). No, seriously - If I listen to HD 540 on one ear and to HD 530 on the other ear (on earbud is still working) it sounds the same to me as 2x 540, maybe 540 is a little bit better but it'd be hard to do bilnd-tests on this

The guy who owned them before me seems to smoke 100 cigarettes a day

but I know how to get rid of that "perfume".
Again thanks to everyone - I'll be happy ever after.

Cheers tigre
[EDIT] To get rid of the smoke odour I disasembled the HD 540 to put all parts that can stand this treatment in the washing machine

. There's not much difference between HD 540 and HD 530, but I took the opportunity to take some pictures:

left: HD 540, right HD 530; details:
HD 540 and
HD 530The membrane of the 540's feels more stiff somehow. I've noticed that the HD 540's are even loud enough on my cheap crappy Lenco mp3 discman.
@Frank Klemm: HD 530 and HD 540 are open (or semi-open. HD 525 (and lower, I think) are sealed.[/Edit]