How the speaker converts the electrical signal into an acoustic signal
This magnetic field interacts with the magnetic field of the permanent magnet and drives the coil to vibrate. The cone connected to the coil is also vibrating, and the sound is emitted.
The original weak signal amplified and then into the speaker, after the speaker coil will produce a change in the magnetic field.
Put the tape, the tape recorder to pick out the electrical signal, through the preamplifier amplifier, amplifier and so on.
