Yeah, saying HE500 has a ton more detail than HE400 is a hyperbole indeed.
HE500 is more transparent in the midrange because of its more even midrange FR (both in smoothness and in levels) and nicer harmonic distortion figures; one could argue that transparency is rather like detail, but IMO it's more like "correctness" of the details.
I'd have to say though treble detail is a lot more "in my face" with HE400 due to its treble FR, than HE500 where everything in the treble is almost too subtle, enough so that it prompted me to look into alternative earpads and pad-fi modding.
The point that Dryvadeum is trying to make, it seems, is that the quality of detail is just as important as the presence of detail, and in that regard HE400 lags behind the heavy-hitters.
Edited by jerg - 4/3/13 at 3:50pm