Why are some songs distorted on my Macbook Pro but not on my iPhone 4?

I purchased the new Patrick O'Hearn album through my iPhone 4 (latest iOS) with the ITUNES app. When I got home and synced the phone with my 2008 Macbook Pro (Lion with latest patches) and began playing the album through my desktop speakers, some passages of the music seemed distorted or over-driven. At first I suspected a poor digital encoding of the music, or problems with the cable or speakers. I plugged the cable directly into the headphone jack of the iPhone and the music played perfectly, and without distortion.
So, the problem is the MBP, or iTunes. Can anyone offer suggestions to remedy this?

I had Sound Enhancer checked. When I removed that option the distortion was still there but was reduced.
I played several similar songs (same artist, same levels, similar composition) that I have had for a long time and found no distortion at all. The old songs had been ripped from the CD to MP3 format or purchased as MP3 from Amazon.
So it doesn't appear to be hardware related (MBP, cables, Speakers), but instead may be encoding (AAC) or DAC related to differences between MP3 and AAC.
Still looking for a solution.

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