HipHopScribe
Headphoneus Supremus
The thing is that the fiio X3ii isn't bright at all, actually it is less bright than V10. It's just, I feel like it is more extended. I know that measured Data always says that everything has a perfect extension and a perfect frequency response but my ears don't feel the same. Even fiio's extension isn't perfect, For example when I connect Cayin C5 amp to X3ii (on V10 it has less effect since there is no line out) the extension gets even bigger and soundstage gets wider so the theory that every DAP extends more than my not-so-big hearing range seems suspicious for me. Maybe my ears trick me and something different happens and makes me think that there are higher frequencies. And I can say the opposite for bass extension. I think V10 can produce lower frequencies.
Fair enough, I certainly don't mean to dismiss your observations