I'm getting consistently awful audio quality when playing back songs in iTunes. These are songs that sound nearly perfect when the same file is played on my 5-year-old iPod Mini. And my $2200 Macbook Pro can't handle them. Um? I have really nice earphones (they're intended as studio monitors and used by serious musicians), the Ultimate Ears super.fi Pro 5. They're absolutely wonderful and I love listening to music with them. However the audio quality of any music in iTunes just flat-out sucks. I hear these really annoying modulating waves of static and intermittent high-pitched whining sounds of different frequencies (as if you'd pressed your ear up to a CD player reading a disk, though there's no CD in the drive). On top of that the sound is flat and sounds cheap and plastic, as if it were coming out of my mom's iBook's internal speakers. Blech. And again, this is the same stuff that sounds awesome, tight, and clean on my iPod (there's a slight static noise but it's barely noticeable unless listen to classical). I also hear the static and the cd sounds when the headphones are just plugged in, though it seems to cut after ten seconds or so and goes silent (the sound card going to sleep?). The catch: none of this is ever noticeable when I'm watching TV shows from iTunes or Hulu. The sound is nearly perfect, just like listening to my iPod. Though if I pause or end an episode the noises return. I'm not sure if I just don't notice it because the TV show's background noise fills the spectrum more or something, but it seems worth mentioning. Mac OS 10.5.4 on a 2.4GHz Macbook Pro with 2GB of RAM. Bought new in February w/AppleCare. (The issues have always been present). Any and all ideas appreciated. Thanks.