So far in comparison, the x3 fw 2.14 with the x5 fw 2.0; They seem to have the same clarity, but the x5 has more detail all around and sounds a bit more airy. X3 has more bass, and you simply cannot EQ the x5 because for some reason a GIGANTIC veil covers your music as soon as you go to anything other than normal. Also, Line out from x3 is alot better than LO from x5 so you can't really amp it. LO from x5 seems more muffled than LO from x3, both are low gain. The headphone out of the X5 though is alot better, with less bass. I'm only slightly disappointed in the x5, but I'm going to give it burn in time and see what happens.