Update:   Yesterday I've noticed that the disturbing-noise isn't just hearable when playing musik on higher volume. Also it is there when the pc is muted. This is really annoying but not the worst. It is also hearable with the headphones when the output is set to just the speakers. I can't...

I didn't heared the FiiO, but consider that it is better compared to the VX1. Simple conclusion: Same price, less features -> better parts So if you don't need an amp for a pair of passive speakers i'd go for a Fiio E10, but also the VX1 is an nice amp. Just one thing is a little annoying: at...