Audio CD Spinning Noise

Hi there,
I recently purchased my father a mac mini to sit as a media centre under his LCD TV. All hooked up great and it all works very well... apart from audio CD's, they spin at a ridiculous speed meaning that when the sound is low all you can hear is the disc spinning and a lot of noise from the box.
DVD's are fine, and oddly so are the discs from Deutsche Grammaphone...
Do you reckon this is a fault or behaviour normal??
Thanks
David

I haven't tested with burned cd's.
This speed increase happens everytime Itunes plays a regular audio cd.
I find it really strange. The only reasonable explanation is the the MBP's drive somehow isolates spinning noise better than the drive in the mini. On the other hand i find that unbelievable as no apparent spinning noise can be heard from the MBP when playing audio cd's.
To me it appears as if the mac mini simply spins the cd faster than the MBP. Again something that would make absolutely no sense.
Well, as I only use my mac mini as a media center, it would be really cool if I could restrict the rotation spped of the drive. Like I could tell it spin no more the 4x.

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