Started playing with different old sources , just for fun, testing the new toy and wow ! a lot of surprises.
The most unexpected surprise is an old IPhone SE, whitch never had enough power for my taste to drive Senn IE 80 and IE 800, now is very good (for a phone though) with FH 5 , nice bass mids and highs, and some power reserve, I am not listening at max volume and it is loud enough and pleasant.
The next surprise is Fiio X5 2, FH 5 just take out the best ever without amplifier. From my current phone Samsung E10 the sound is quite good, if I will have to use it without an amplifier for some travel it will be quite enjoyable.
I think that FH 5 is a very good all rounder, sounds good direct from phones and medium players, but when it is paired with DAPs and headphones amplifiers the sound becomes very very good.