Basic features of loudspeaker

1. The two wiring terminals, when using a single speaker two pins regardless of positive and negative polarity, the speaker also use two pins have polarity.

2 speakers have a paper basin, it is usually the color of black, there are white.
3 shapes are round, square and oval, and several other categories.
4 on the back side of the paper is a magnet, external magnetic type speaker with a metal screwdriver to touch the magnet will feel the presence of magnetic; magnetic speakers in this sense, but there is a magnet inside the shell.
5 mounted on the machine panel or in the sound box.
Hope that the above remarks in your use to help, you are welcome to call advisory.