I'm noticing recently that when I listen music with my EarPods that I'm raising the volume much much more than usual, but the sound is not as high. For some songs I'd put my volume to maximum and it's still not loud enough. I'm clicking the volume + buttons 3 or 4 more times than I usually do with some songs. Is the problem with my EarPods (they are brand new), or that I'm using iOS 9, or that my hearing is just getting worse?