On Xbox one all audio is louder when the player is facing away from the source of the sound, I believe this is because the games audio setting by default are set to surround sound and there is no option to change this in the settings.
There is only a master volume slider.
This is infuriating as every time I talk to an npc I have to look away to hear them clearly and whenever I hear an explotion or gunshots in the distance and I want to investigate I end up running in the opposite direction, this really needs a fix.