Speakers. An explanation of how speakers turn electrical signals from an amplifier into physical movement which we can hear and the different types of vibrations which change what we hear.

The speaker is the part of any sound system which creates the physical vibrations the human ear detects and interprets as sound. It accomplishes this by using an electromagnetic coil in a standing field to translate the electrical signals from the amplifier into physical movement. The electromagnet is attached to a diaphragm, usually cone shaped, and the vibrations of the magnet are expressed in the cone, which causes similar vibrations to occur in the air in front of it. These vibrations travel through the air and are heard by the ear as sound.

Different frequencies of vibration correspond to different pitches of sound, from very slow vibrations which are the low, deep sounds to very fast vibrations which are the high pitch sounds. The size of the cone determines it's ability to vibrate at certain frequencies, it's harder to get a large cone to vibrate fast or a small cone to vibrate slowly. For this reason larger speakers usually contain multiple drivers, with different sized cones for producing different pitch ranges.