massive ceiling fan/light control THUMP through amplifier

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I have a gainclone that I am running in my new house. The problem is that when I change speeds on my ceiling fan, there is a massive thump that comes through my speakers that is enough to make a person jump. I am afraid for my speakers, although it is not louder than music would be if I were to crank the volume. However, it is annoying and embarassing. How can I fix this problem (switching power outlets is not really an option in this room)??
 
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