The Ebtech Hum X Hum Exterminator filters unwanted voltage and current on the ground line that causes ground loop hum while simultaneously maintaining a solid, safe ground. You no longer have to run your audio signal through any type of tone-sucking filter or use dangerous ground lifts. Simply place the Ebtech Hum X on the end of the power cord of the offending equipment and plug the Hum X into the power outlet. The Ebtech Hum X is the easiest, safest way to get rid of ground loop hum!