Originally Posted by DarkSky
That's because they have no isolation - they are a semi-open-back design. So they're unsuitable for tracking. You would be far better off with the K271S, which is closed and also cuts very well. Purpose built for tracking.
I never could get the hang of MDR7509HDs. Always find them too bright and brittle sounding. YMMV
I agree with your assessment of the construction of the 240s, but I find them to be really present for some reason, which is why I like them for tracking. Maybe that's just my peculiarity....
As for the MDR7509s, maybe that's why I like them, because they help me combat my tendency to "over-air" my mix....I sometimes get just a hair shrill because years of loud-ass drumming have killed some 6k+ in my right ear...haha. But I also find them to have amazing bottom end clarity and detail for a set of cans, so that's kind of a nice change.