Are line harmonic suppression filters ever used for audio amplifiers?

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A complete line filter must include, a common mode double inductor in the line and neutral wires, a dual isolated inductor in each line wire, a large cap between lin and neutral (1 to 2.2 µF X2) and several Y capacitors in the order of .0047µF.

This way you cancell both common and differential interference to and from supply. remenber that if you have inductive load as a traffo in the amp side of the filter, the possibility of resonances.
 
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