It would probably be better if you did not coil, but in stead just make one loop, like a long U. Make sure the legs of the U are not parrallel to speaker or line level cables.
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It is true that coiling a wire creates an inductor, but that is not always a bad thing. Inductors tend to block high frequencies, and if your power cord blocks high frequency RF from getting into your equipment that would be good.
I suggest you try it and see if it makes any difference in the sound. That's really the only thing that matters.