IMHO, this is not a safety problem, your surround sound system appears to be picking up the electrical noise when the fan is switched off. Your could try a high quality noise suppressor on the feed to the sound system. You can double check all of your cables to and from the sound system and make sure all of the connections are tight. It MAY be possible to replace the fan switch with one that has suppression built in, however I would need to research this.
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Pennsylvania, for 60+ years, most recently, Allentown, now TV. 
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