Thanks for the info, Jefic!
Don't take my questions the wrong way, I'd just like to clarify things a bit further. You describe the 530 as woolly-sounding, but don't seem aware which version it was? Also, what's the source for the info that the drivers aren't the same between the 530 and the 560?
A guy made a review of the HD 540 and HD 560 here: http://www.head-fi.org/t/208013/review-8-european-full-size-open-dynamics-1985-1995-long
Although I'm not sure if wyki would agree with the boominess in the bass, this is also a guy who found (or had reason to assume) some 560s to have been bright.