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Just one 'picky' correction about Part-15 devices.  They are not "protected" under any circumstances.  They have to accept any interference and can cause none.  No choices at all.  Part of the definition of 'Part-15'.


To go along with that torroid suggestion, placing a 0.001 capacitor in series with the speaker's 'hot lead sometimes helps.  Might change the frequency response of the speakers a bit, but that's better than interference, I'd think.  A five gallon bucket of torroids is a nice thing to have around...

 - 'Doc