Anyone else have audio distortion?

Hi everyone,
When I listen to certain audio, there's some distortion. I do not hear the distortion on the same audio with my iMac G5 and previous generation MacBook Pro. Is this something specific to my new MacBook Pro, or is it something specific to the new unibody models? It seems like the dynamic range of the headphone jack is limited.
Is anyone else experiencing this?

Hi Michael,
Thanks for your help here. I put the setting to 16-bit (from 24-bit) and it made no difference. Coldplay's "Lost?" is a good example. On my older MacBook Pro 2.2GHz, I can listen to the song at .74 (-9db) and it sounds fine, but on my new MacBook Pro it sounds scratchy especially with the piano. Basically anything where piano is the dominant instrument has the potential for distortion. Certain dialog scratches too at the higher volumes. I'm using Sony MDR-7506 headphones which I regard as pretty decent for monitoring sound. So I don't know if this is something that I need to call Applecare about or whether it's just how the new unibodies are? Regardless, it's disappointing.

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