Have you ever asked yourself why your DVD Player is much more quiet than the CD-ROM drive in your PC. It’s because playing audio/video just needs a reduced reading performance which calms down your drive a lot.
In Linux you have two possibilities: eject or hdparm
Eject can read out and set all possible speeds for your drive: To read it out use eject -X(capital X!)
Set your desired speed variable with
eject -x n
where n is a number like 2,4,8 or so on.
For hdparm you just type
hdparm -En /dev/cdrom
where n is the desired speed like 2,4,8 and so on and /dev/cdrom is the propriate device.
Of course the speed must be set before playing a medium 
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