What are the basic characteristics of speakers?

(1) The speaker has two terminals (two leads), and when using a single speaker, the two pins do not differentiate between positive and negative polarity. When using multiple speakers simultaneously, the two pins have polarity.
(2) The speaker has a paper basin, which is usually black or white in color.
(3) The appearance of speakers can be divided into several categories: circular, square, and elliptical.
(4) The back of the speaker paper basin is a magnet, and when using a metal screwdriver to contact the magnet for an external magnetic speaker, the presence of magnetism will be felt; There is no such feeling in an internal magnetic speaker, but there is a magnet inside the casing.
(5) The speaker is installed on the machine panel or inside the speaker box.

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