New rig!
DX50 (1.2.3b) --> coaxial --> Fiio E17 --> Fiio E09K --> Beyer DT1350
It's strange that the treble "distortion" (to me) seems improved after I flash it back to 1.2.2, and then to 1.2.3b again.
Human brain is magic. lol
Of course this rig is not portable and is intended to pair with yet-to-come Beyer T90.
Who cares about portability? That's a great desktop combo.
I have let go the transport route for now until the Leckerton UHA 760 with coax is going to be out so for now my trusted intruder plugged to my icon2 will do.