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The Hum X filters out unwanted voltage and current in the ground line that cause 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. Simply place the Hum X on the end of the power cord of the equipment that has a Ground Loop and plug the Hum X into the wall outlet. Ground Loop is gone -- safely -- and audio signal remains intact. The easiest, safest way to get rid of ground loop hum.