thanks to your posts, I ordered the HE-4 and received it today. Right now, I am listening to them through the audio out from my MBA and playing music through Amarra. You guys are spot on, its a very very good music with fantastic detail and separation. To my ears, the treble is a tad less than the 400. The bass hits hard and deep and I'm not even EQing. I've had it playing for a just a couple of hours so the weekend will be filled up.
Thanks again guys. Planning to use it with the Gungnir/Mjolnir so let's see where that takes me.