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So recently I bought a Beyerdynamic DT770 Pro 80ohm headphone, which I'm using with both my laptop (Thinkpad T400) and my mp3 player (iAudio U3).

I thought after some reading that it is worth investing in a headphone amp.

What my options came down to are: Fiio E07K Andes OR Fiio E11.

Which one should I choose if I would use it with both machines? And lastly, does it really give an improvment in sound quality? I don't care about volume too much, most of the stuff I play is driven well enough.