Low frequency rumble:
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Small switch, toggle switch
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Small electric motor
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Turn off the appliance,, Turn on
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Shutdown,, Electronic energy, start up
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Movement, Low frequency electric drone
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Electricity, Current, discharge
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Electric sparks
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Electric discharges, Tesla coil
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Electrical discharge surge
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Shoots an electric arc indoors
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Low frequency rumble
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Jacob’s ladder, Electric discharges
★★★★★