Some headphone porn:thank you the great reply, @DavidA!
i'm going to try both fiio and onkyo with and w/out balanced cable.
also, will find desktop amp to try and get convinced to ditch portable solutions
L to R: EL-8, HD6XX, HD650, HE560 and HD700
Back: UD-301, SYS, Ember, Lyr2, and BH Crack (there is a small visible section of Bimby behind the SYS under the table)
Fiio X3 in the middle of the table and X3ii on top of UD-301