Low frequency rumble: Listen & Download Low frequency rumble .mp3 Error! Change your browser, please! ⇓ Download Shoots an electric arc indoors ⚠ Wall switch ⚠ Electrical discharge surge ⚠ Button click ⚠ Turn on, turn off the appliance, ⚠ Small electric motor ⚠ Low frequency rumble ⚠ Current, discharge, electricity ⚠ Multichannel switch ⚠ Electric discharges, Tesla coil ⚠ Jacob’s ladder, Electric discharges ⚠ Switch ⚠ ★★★★★