How does a loudspeaker work?

1)a current in the coil creates a n electrimagnetic field 2)the electromagnetic field interacts with the permanent magnet generating a force pushing the cone outwards 3)the current is made to flow in the opposite direction 4)the direction of the magnetic field reverses 5)the force on the cone now pulls it back in 6)repeated alternation of current direction causes the cones to vibrate in and out 7)cone vibration cause pressure variations in air which are spound waves