Ground Loop Isolator Installation

Written by mike wallace
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Ground loops are the bane of home theatre enthusiasts. A ground loop occurs when current flows through the ground path of a home theatre system. The only way this can occur is if the ground potential is different at various ground points in the system. This usually occurs when a system is plugged into cable television, since the ground potential of the cable may be different than the ground potential of your house's electrical wiring. The symptoms of a ground loop is a persistent 60 Hertz hum. Getting rid of the ground loop hum requires installing an isolator.

Skill level:
Moderately Easy

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Things you need

  • Ground Loop Isolator

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  1. 1

    Unscrew your cable from your cable box.

  2. 2

    Attach the ground loop isolator to the end of your cable. This will block the 60 Hertz signal from passing through the cable and into the sound system.

  3. 3

    Screw the cable back into the cable box. The ground loop will be eliminated.

Tips and warnings

  • You can use old television antenna baluns as makeshift ground loop isolators. They are quite a bit cheaper than ground loop isolators. A balun is a tiny transformers, and the 75 to 300 Ohm baluns used to connect antennas also does a good job of filtering out the 60 Hertz noise.

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