What head/ear phones are people pairing with the x5? I've only tried the RE600's, and I find the sound to be a little disappointing. I suppose if I compare it to other players in it's price range, it's not bad. But these days, I really want something that will blow me out of the water if I have to manage it outside of itunes.
The only player that has really blown me out of the water, is the HifiMan HM-901 with standard or balanced amp, paired with the RE600's. I know it is also 3-4x the price. However, I will say that Fiio really got the UI and build quality down, which is a major disappointment with the HM-901.
Btw, I am using m4a lossless files
Very open to suggestions, as I have not made a final decision on the X5.