You probably won't have alot to worry about. Any speakers that come in the machine *should* be magnetically shielded. Any computer speakers you buy are also magnetically shielded. Unless you start throwing in your own car audio system or something you should be fine.
Just amke sure you use magentically shielded speakers. Also keep in mind the the shielding on a $5 pair of speakers may not be very good. Also keep in mind that sometimes the back 2 speakers on a surround sound system may not be shielded even if the front 2 are.