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How can electrical outlets and wires affect the signal in a cable?
Electrical outlets and wires can affect a signal in a video or audio cable by introducing noise. This noise can affect both the image and the sound.

Electrical outlets and wires transmit small electromagnetic fields. Electrical motors do as well, only larger. These fields have a steady cycle to them that can often be seen in video or heard in audio.

To preserve audio and video quality, keep AV cables as far away from electrical outlets, wires and devices as possible. If your cables need to cross electrical wires, make sure they do so at right angles to minimize the amount of close contact.

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