I too have noticed that FW v.1.1.7 sounds better than v.1.2.3. Wasn't so apparent via line-out to my Intec 205 system, but via my W5000's it certainly was.
iBasso need to make sure the next FW update finally gets the best of both FW versions. And only improve on that, not one step forward and two backwards.
Edited by the wizard of oz - 9/11/12 at 4:15am