Just another reason to love the he-400:
Some headphones really load the treble with tons of extra energy. Take the Dt-1350 for example: those little portables are surprisingly good, but c'mon Beyerdynamic! You've really gone overboard with the treble again. Sure, the Dt-1350 is detailed and vibrant, and I love hearing all the little details--brush strokes and all that jazz--so, Bravo! But wait one second, Buster! All the extra energy comes at a serious penalty or two: ear fatigue and artificiality. So don't congratulate yourself just yet.
If the 1350 is a four alarm fire (I'm exaggerating here of course), then the he-400 is a crackling camp fire where headphone enthusiasts can huddle on cold and starry nights. Seriously, though, all the 1350's extra brightness seems so superfluous to me; it merely accentuates or highlights details that should realistically remain subtle. Now the he-400, on the other hand, presents all the details in an unobtrusive way. That's right, it accentuates almost nothing, and yet it omits no nuance. Somehow the he-400 lovingly imparts detail, and air, and an amazing sense of space without overloading the higher frequencies. I've owned the he-400 for nearly three months now, and every week or two, I discover another reason to appreciate these headphones anew. Thank you, Mr Fang! Job exceptionally well done.