When an audio device receives a buzzing feedback it is often referred to as a ground loop. The humming noise that sometimes comes from speakers is a form of ground loop. This buzzing noise is caused by voltage prospective differences that are found at the ground point of the mechanism, i.e. a speaker or headphones.

A ground loop may transpire when more that one audio element is powered from different power outlets. When this takes places the hum or the buzz is what results and is heard through the audio device. When this takes place a ground loop isolator may be needed to repair the issue.