Ebtech HE-2 Hum Eliminator by Morley 2-Channel Passive Design 1/4" I/O HE2
The Ebtech Hum Eliminator™ is designed to eliminate 60 cycle hum (60Hz AC signal) caused by Ground Loops. It is also designed to convert unbalanced lines to a true balanced lines. Why? Unbalanced lines are more susceptable to picking up electrical noise and RF interference. The Hum Eliminator™ does more than just prevent AC hum from being picked up by your sound systems. It also can be used as one of the most cost-effective ways to convert unbalanced signals to true balanced signals.
The Ebtech Hum Eliminator™ prevents ground loop antennae from forming and picking up AC hum. AC hum & noise is almost always caused by a loop antenna effect across signal lines between two or more pieces of gear, or by long unbalanced cables picking up noise. Loop antenna(e) are basically a type of radio antenna, which tend to pick up the 60Hz (and harmonics) AC signal being broadcast by a building's electrical current. These loop antennae are closed circuits usually along the ground wires and hence are commonly called ground loops.
Unbalanced signals are more susceptible to picking up electrical noise & RF interference than balanced signals are. The longer the unbalanced cable, the greater the chance of a problem. The Hum Eliminator™ is one of the most cost-effective ways to convert between unbalanced signals and true balanced signals.