How to make a simple Speaker

Today Im going to tell you how to make a simple speaker.First of all you need a plastic cup,a Magnet,coil.Then turn coil around the magnet turn about 40 turns.Then after fix the magnet middle of the plastic cup.finally connect the wires to the out put of your radio set then you can listen the sound.
Note

# Before you switching on the radio check whether volume controller is in low position or not.Because If not the coil will be burnt.