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Even if your equipment had perfect RF noise rejection built in to its power supplies, the RF noise present on the power cords may still be coupled to the interconnect and speaker cables. RF noise may get into equipment through any port and affect the audio signal.

IME, it is important that the power cords and cables be damped as well as shielded, so that they do not support RF ringing modes. These modes are especially troublesome if they overlap and make the coupling among cables stronger. Filtering the noise on the AC is helpful in the feed to the audio system and at the noise-generating appliances. These days, almost all appliances contain switching power supplies and computers, and generate noise continuously as they wait for the user to push a button.

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