When playing different audio sources I have a lyres and crackling in the background. By moving the mouse, these were even louder. The gain in a 32 ohm earphones was extreme. At 600 Ohm headphones Fiio E10 did not bring the desired performance, which would have been nothing if I would have increased my Beyerdynamic with 250 Ohm.
Because of the described problems I sent the Fiio back.
