I have been using two minis (one serving my stereo and the other one connected to my headphone amp) for several months now without experiencing major problems. Both devices are set to ARIES analogue outputs. Yesterday I downloaded a new album from highresaudio.com whre I use to buy all my music (Diana Krall: Wallflower 48 kHz / 24 bit FLAC). When playing back the very first track I was shocked because I experienced a massively distorted signal from my loudspeakers. The same issue occurred when I tried out my other mini which is connected to my headphone amp, an AUDEZE Deckard. I set the mini to the USB output, thus bypassing the mini’s DAC, and switched to the Deckard’s DAC - immediately the distortion was gone.
Now I experimented a bit. When I replaced the mini’s firmware 5.8 by the beta 6.1.1 the distortion vanished. So I could switch back to the adjustment (using the mini’s DAC) I had in the first place and the playback quality is flawless now.
Did anyone ever have similar problems? Like I said, this issue occurred solely with the new album, all my thousands of tracks were so far played back without any distortion.