Thanks for the advice, I misunderstood what you were saying last time so I was totally thinking something else. My apology here. I did the whole think again and generate some new set of graphs but I guess the result isn't much different form the last trial. I double checked everything and believe it is the soundcard line-in that isn't behaving very linearly. I used another USB soundcard line-in and redid some of the test again but the result are not that different from the first set of data, so at this point I think I'll take it as it is. Not much I can do anyway. I heard the FiiO is planning to publish some technical spec themselves so maybe we will get to see more detail graphs later.
FiiO E5 amp (E3 upgraded) - Page 55
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they also don't increase the volume at all.






