PS- in my opinion the Soundmagic's are totally worthless without an AMP (it pairs quite well with the Schiid Magni), so that the bass and impact/dynamics are controlled/refined nicely rather than endlessly boomy.
Gonna have to disagree with you pretty strongly here. I think these sound pretty good without an amp, which is why I have them.
But I will say that these DO scale spectacularly. I listened to them off a Fiio X5+E12 at CES and they were really impressive. I also listened to them off a Chord Hugo and they were mind- bogglingly good. I'm very familiar with the HP100 as I listen to them for a few hours a day at work. The Chord made them sound like I've never heard before.