Guys, I have compared the HD650 to the HE-400 and wanted to see how they differ on female vocals (I always read someone is bitching about female vocals on the HE-400) with velour pads.
What I found was the HE-400 pushes the sibilance, and other crap in the recorded voice really up front, but pushes back the harmonics and the high notes of female vocals a little back. In other words, female vocals aren't "complete" like male vocals on the he-400, they sound unnatural, I'm not talking about timbre or tone, just very odd.
On male vocals, the HE-400 the best i've heard. Listening to Alicia Keys - No One sounds like she has lost her voice. Very strange.