The speaker components are permanent magnets and coils {also called: voice coil}.
Permanent magnets are machined from magnetite. Coils are usually wound with copper enamel wires and sometimes glued directly into hollow cylindrical {for low power speakers}, sometimes fixed on a paper hollow cylinder {for medium power speakers}, and large The power speaker uses a metal cylinder to hold the coil.
Other speaker components include speaker brackets, cores, centering tabs, paper membranes, binding posts, leads and dust caps.
The bracket is made of metal and is lacquered, but the general speaker is not painted. The iron core is of course made of iron~! The centering piece should be made of chemical fiber. Needless to say, the paper film is only fixed on the piece of hard paper by two small iron pieces for easy wiring, and the terminal is fixed on the bracket. A lead is a wire that connects a signal from a terminal to an internal coil. The dust cap is a nearly hemispherical plastic piece that is placed in the center of the speaker film to prevent dust from entering the speaker and causing it to be damaged.
