What are woofers and tweeters?
Speaker driver called tweeters, those for middle frequencies are called mid-range drivers, and those for low frequencies are called woofers, while those for very low bass range are subwoofers. Less common types of drivers are supertweeters and rotary woofers. The mechanism most widely used in speakers to convert the electric current to sound waves is the "dynamic" or "electrodynamic" driver, invented in 1925 by Edward W. Kellogg and Chester W. Rice, which creates sound with a coil of wire called a voice coil suspended between the poles of a magnet. There are others which are far less widely used: electrostatic drivers, piezoelectric
Tweeter in turn vibrates the air, thus creating air motions or audio waves, which is heard as high sounds. Modern tweeters are typically different from older tweeters, which were usually small versions of woofers. As tweeter technology has advanced, different design applications have become popular. Many soft dome tweeter diaphragms are thermoformed from polyester film, or silk or polyester fabric that has been impregnated with a polymer resin. Hard dome tweeters are usually made of aluminium, aluminium-magnesium alloys, or titanium. Tweeters are intended to convert an electrical signal into mechanical air movement with nothing added or subtracted, but the process is