In sound recording and reproduction, ground lift or earth lift is a technique used to reduce or eliminate ground-related noise when connecting signal lines between two or more pieces of equipment. It interrupts the ground line at some point. It is particularly effective at eliminating ground loops, but it may also increase or decrease noise from other sources.
If all pieces of equipment are tied to a common ground reference, no current flows in the ground conductors and cable shields, and no noise is introduced into signal circuits. In applications such as sound reinforcement for a concert, however, it is difficult to ensure all equipment shares a common ground reference.
Read more about Ground Lift: Ground Lift Switch, Other Ways of Isolating The Cable Shield, Safety
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