Eli5 How do speakers turn signals into full sound, it could sound like you’re in front of a concert but it’s just a box

Question

Eli5 How do speakers turn signals into full sound, it could sound like you’re in front of a concert but it’s just a box

In: 10

Answer 1

You have a speaker with a cardboard cone and a magnet attached to it. The magnet is inside a coil. Sound pushes the speaker cone which moves the magnet and this movement induces a varying voltage on the coil. To replay a sound do the opposite by applying the exact same varying voltage to the coils which moves the magnet and the speaker cone the same exact way producing the original sound again.