T1 Audio T1-620 - Ground Loop Isolator Noise Filter.

Blocks ground loops within an audio system, reducing backround noise without imparing sound quality. The most likely cause of speaker hum is due to something called a ground loop. A ground loop occurs through differences in resistance in the electrical system. When a car audio component is connected to an amplifier, a path is provided for electricity to flow from one wall socket to another as the electrical system tries to balance itself. This causes speakers to hum! The Xitel Ground Loop Isolator goes between your audio equipment's connection, breaking that ground loop and stopping the annoying hum!