Edit: Problem solved with a reboot. See my post below. When I listen to music with my earphones (Etymotic ER4P), the volume is much lower when turned all of the way up in comparison to my 3GS. I have sound check and and volume limit off. I'm using the same EQ setting as I was with my 3GS. I haven't tested boosting volume on a file by file basis in iTunes yet. Anyone else?