The term "loudspeaker" can refer to individual transducers (known as "drivers") or to complete systems consisting of an enclosure incorporating one or more drivers. To adequately reproduce a wide range of frequencies, most loudspeaker systems require more than one driver, particularly for high sound pressure level or maximum accuracy. Individual drivers are used to reproduce different frequency ranges. The drivers are named subwoofers (for very low frequencies); woofers (low frequencies); mid-range speakers (middle frequencies); tweeters (high frequencies); and sometimes supertweeters, optimized for the highest audible frequencies. The terms for different speaker drivers differ, depending on the application. In two-way loudspeakers, there is no mid-range driver, so the task of reproducing the mid-range sounds falls upon the woofer and tweeter. Home stereos use the designation "tweeter" for high frequencies, whereas professional audio systems for concerts may designate high frequency drivers as "HF", or "highs", or "horns". When multiple drivers are used in a system, a "filter network", called a crossover, separates the incoming signal into different frequency ranges and routes them to the appropriate driver. A loudspeaker system with n separate frequency bands is described as "n-way speakers": a two-way system will have woofer and tweeter speakers; a three-way system is either a combination of woofer, mid-range, and tweeter, or subwoofer, woofer, and tweeter.
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