Self changing sound volume

For some unknown reason the volume setting on my mini seems to randomly want to change all by itself. I normally like to have the system volume set to 75% (12 out of 16 spots on the scale) and change the volume through a set of speakers, although every now and then I find that it's reduced by itself to 56% (9 out of 16 spots). The drop in volume is awfully consistent.
Has anyone else noticed this? Or is this a "safety" feature so that will maximise sound volume between restarts or something.

I pondered that although if that were the case all Macs that come with FrontRow would show the same behaviour.
My best guess is that it's like my mother's car stereo. Everytime you turn off the engine the stereo will reset itself to a lower volume to ensure that the next time you turn it on your ears aren't blasted out. Given the higher likelihood that a Mac mini is connected to a home stereo/cinema unit this might be Apple's thinking.
Who knows… it's just annoying as ****!

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