FYI, I just recently got some AKG K712. It is excellent in resolution. The K240 is likely very good as well, but it has a bump in the 100hz midbass area and a pretty high peak at the 6-7khz area. This would make the midrange a little hidden, but the resolution is likely very good.
Googling shows that these particular headphones were made about 37 years ago. Not sure if that's what you really want to spend $125 on unless you want them for vintage/memory purposes.
I have visited and listened to B&O stuff and it has never impressed me. Their products are more for people who want that gadget type look instead of people who want a good sounding system.
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