I'm using my LG G4 with a Fiio A9 amp and a pair of ATH-M50x's. I've noticed that when I use the amp, that the output icon in the notification bar turns to an auxiliary cable. When the amp isn't being used and only the headphones are plugged in, I see a headphone icon. Is there any chance that the auxiliary output mode is degrading my sound quality compared to the headphone icon??? Because if so, I'd like to use my amp with the headphone icon/mode forced to be active.