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Review title: 100% won't work to reduce 60 hz hum from Dimmer Switches
Product review: Dimmer switches are notorious generators of electromagnetic interference. The Hum X is described as: "The easiest, safest way to get rid of ground loop hum." Well if you are looking to get rid of the hum coming from your guitar amplifier and you can any turned on dimmer switches within 30 feet of your amplifier, than this doesn't reduce that dimmer switch hum by the smallest bit. There is no difference at all. It works for most people because they are using it to get rid of simple ground loop hum involving basic electrical interference. For 70$ it should at least make some kind of difference right? Even if it does work, it's very overpriced.
