I have spotify premium and set to high quality and I've noticed quite a lot of distorting.
windows 8.1 -> spotify -> odac -> o2 -> hd600
right at 0:40 when Jack starts singing "I got you" and every time afterwards, I get distortion. At all volumes. I have turned down spotify, turned down system volume, etc. On my O2, it's on low gain (1x) and I hear the distortion with all my...