Epic fail. Thanks for the reply! Sounds like that would be an awesome way to go if I can find someone to do help with the upgrade!
@ClieOS would you happen to know (perhaps in passing, from Fiio guys) if the X3 1st gen has a dual rail supply? Or just a single rail supply?
Still looking for other chips that might work.
It has been awhile since I measured it, but IIRC, it is dual rail +/-5V.
p/s: Found it, here it is:
I finally mod my X3.
AD8692 to ADA4841-2
AD8397 to AD8620
( But I have no exact idea on the other capacitors mod as suggested in the erji thread.)
This now sounds like a new toy and should keep me busy listening to my collection for some time.
Many thanks to this thread, thanks to erji, thanks to ClieOS.