My current speakers (Altec Lansing's) are EXTREMELY sensitive to radio waves. They not only pick up cell phones, my wireless print server (for internet) and even bluetooth, but often when there's a plane passing by, you can hear radio chatter that's coming from the plane.
The same thing happened with my brother's speakers (Logitech), but it was only for the planes (no wi-fi, bluetooth, etc) and it stopped after a year or so, never happened again.