Loud Speakers

Loudspeakers are used to communicate sound.

A loud speaker takes an electrical current and translates it into physical vibrations to create sound waves.

The electric current that the speaker uses is a direct representation of the physical vibrations initially recorded by a microphone.

The sections of a loud speaker are:

• The cone, usually made of paper, plastic or metal, is attached on the wide end to the...
  
  
• Suspension, or surround. This rim of flexible material allows the cone to move, and is attached to the...
  
  
• Driver's metal frame, called the basket.
  
  
• The narrow end of the cone is connected to the voice coil.
  
  
• The coil is attached to the basket by the spider, a ring of flexible material. The spider holds the coil in position, but allows it to move freely back and forth.

When the electrical current flowing through the voice coil , the coil's polar orientation reverses. This changes the magnetic forces between the voice coil and the permanent magnet, moving the coil and attached diaphragm back and forth. This causes sound pressure waves to be created, which are then heard by the listener.