Is this normal? I experience it on my home theater when listening to music and also on my IEMs with my iPod. Basically, if I turn up the music to loud levels (95-100 dB), it seems I cannot hear the highs as well as when at lower volumes. I did notice one thing though, when listening to music through my home theater, I turned it up really loud (100 dB or so) and put my fingers in my ears. The cymbals in the music were more pronounced and clearer. I guess this means it is not the audio setups and just my ears? By the way, is this normal?