There seem to be quite a number of people wanting some more impressions on the HE-400s around here so I thought I'd spend my Friday afternoon at work putting my mind to paper rather than um... working. So without any further tangental small-talk, here is my first review on Head-Fi - enjoy!  ...

I'm looking for an amp to match up with my Essence STX and HE-500's which are on the way. Looking to spend around $300-$400 if possible. Is there anything that will power the HE-500s well at that price range?   I've been looking at the HiFiMan EF2A or Matrix Cube/M-Stage, unless it's...