Low frequency rumble: Listen & Download Low frequency rumble .mp3 Error! Change your browser, please! ⇓ Download Small electric motor ⚠ Shoots an electric arc indoors ⚠ Tesla coil, Electric discharges ⚠ Low frequency rumble ⚠ Electric transformer ⚠ Multichannel switch ⚠ Electric sparks ⚠ Electrical discharge surge ⚠ Electricity, Current, discharge ⚠ Wall switch ⚠ Low frequency electric drone, movement ⚠ Button click ⚠ ★★★★★