Please do not cross-post, see the forum rules. I've deleted your other two topics with the same question.
This is probably specific to your hardware.
Are these external or internal speakers? Might be that during installation of Linux Mint 14 you shifted something on your desk and half-pulled out a cord or something--if these are external speakers I'd try unplugging all the cords from your speakers and carefully plug them anew. I suddenly had a hum in my right speaker yesterday, after cleaning my desk. So hence my suggestion for that as I have some recent experience
If might also be related to your audio chip driver. Please open the terminal application from the menu and run the following command. Share the output here, it will tell us some basics of your system. You can copy text to/from the terminal, see its Edit menu.
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