Audio distortion in iTunes... no distortion with same file in QT...

I've noticed a horrible low-end distortion when listening to audio files in iTunes...it sounds really muddy... almost as if the speakers are blown. However, the distortion is gone when I listen to the same files in Quicktime. I've turned off the Sound Enhancer, gone through every menu setting that I can think of... all EQs are off... I'm clueless. Any clues? Should I reinstall iTunes?

I was sufficiently piqued by this problem to go as far as clean reinstalling the OS to see if any software conflict was interfering with the ITunes playback in this way. I can now tell you that with a pristine computer running 10.5.8, the distortion still occurs. BTW, I upgraded to 10.6 briefly before doing the clean reinstall, and the same distortion was present.
Next step was to throw out ITunes 9 and install 8.2.1 on the clean computer. Guess what? The distortion on the test track (a demo track from a trumpet practice play along CD) is gone!
I think I've definitively established that there is a problem with the audio quality in ITunes 9. I'm not a expert, of course, so I wouldn't know why this would be, but it seems like the new version adds some harmonic distortion somewhere in its output, independently from Quick Time. While this one track is the most noticeable instance (and how my attention was called to this problem in the first place), I can also definitely hear degradation in audio quality comparing HQ MP3s on a computer running 9 vs. 8.2.1, using the same audio interface (Apogee Ensemble) output and monitors.
I hope Apple reads these boards!

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Welcome to the Apple user to user discussion forums
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DougNorway wrote:
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Audio distortion in iTunes... no distortion with same file in QT...

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