Upper midrange, where art thou? Yes, right here. And there. And seemingly everywhere. Whew, when paired with a detailed and resolute source, the upper midrange exhibits itself with such a voracity it seems, but is toned down somewhat to my ears once a little burning in and also brain burning in comes into play. Vocals are vibrant, rifts are obvious and guitars sound dynamic. I can listen to the HE350 for hours without any sibilance or too-bright issues, since I have gotten used to the bright and open sound of the beautifully created headphone.