Page "Humbucker" Paragraph 3
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Wikipedia
Hum is caused by the alternating magnetic fields created by transformers and power supplies inside electrical equipment using alternating current.
While playing a guitar without humbuckers, a musician would hear a slight but significant hum through their pickups during quiet sections of music.
Sources of studio and stage hum include high-power amps, processors, mixers, motors, power lines, and other equipment.
Compared to single coil pickups, humbuckers dramatically reduce hum, and produce higher output, because both coils are connected in series.
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