speaker noise

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I get noise in one of my computers' speakers whenever the cell phone is
in use, or whenever something else in the place is turned on (such as when I
switch an appliance from 'hi' to 'low' from across the room). IIRC, there is
some way to protect the wires from this? I know something like this has been
covered before, although not sure which group. Couldn't find it in a usenet
search. Also, I have a wireless network, if that makes a difference.
Could someone maybe direct me to a FAQ, a site, or an appropriate group
please?
Thanks so much.