Yep, the E5 is a very low end amplifier (albeit it has decent RMAA scores for its price
). But I'm not even clear why he needs the E5. The D2K has very low impedance (25 Ohms), so I'm clueless why he's getting a low volume .
@Reactive, Have you tried it with only a single source so far, or tried it with multiple sources?
http://www.head-fi.o...-amp-comparison
Head-fi consensus seems to be that an amp will not help much. Given its low impedance, I would agree with this sentiment.
However a good DAC/Soundcard can probably improve the audio quality. If you are OK for internal soundcards, you should be considering the Asus Essense ST/STX in addition to the MX1. I had read a review quite some time ago where the STX was reported as marginally better than MX1. However if you need portabality, the MX1 comes up ahead since its an external DAC.