The terms for distant speaker drivers differ depending on the application. In 2-way loudspeakers, there is usually no driver called "mid-range". At Rest stereos use the designation "tweeter" for high frequencies whereas professional audio systems for concerts habitually designate all types of flying click here frequency drivers as "HF" or "highs" or "horns".
Modern driver magnets are almost always permanent and plastic of ceramic, ferrite, Alnico, or, besides recently, neodymium magnet. A current trend in design, due to increases in transportation costs and a concupiscence for smaller, lighter devices (as in bounteous apartment theater multi-speaker installations), is the employment of neodymium magnet instead of ferrite types.
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