I disagree, I found my Audeze LCD-3's & Mr. Speakers Alpha Dog's both to be noticeably underpowered with just the HPO of the X5 alone. The E12 is absolutely necessary in my opinion for power hungry headphones. It's almost silly to spend 2 grand on headphones too and not want to spend an additional $130 to amplify them properly for portable use but if it works for you I guess.
8/30/14 at 1:20am