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What is a tweeter?
A tweeter is a type of loudspeaker unit especially designed to produce high-frequency musical audio (also called a treble speaker). Tweeters are helpful for great sound as they can more efficiently (and accurately) provide treble sound that many speakers cannot or have poor performance with.
Tweeter speakers have a frequency output range that’s typically approximately 3 kiloHertz to 20kiloHertz, the upper limit of human hearing. Tweeter speakers can be used as an add-on alongside existing full range speakers for additional high-frequency sound performance, although they’re typically part of a 2-way or 3-way speaker system.
As tweeters are sensitive to lower frequencies which can cause distortion and even damage, nearly all require the use of a high pass crossover to prevent the application of midrange and bass frequencies from reaching them.
While more exotic designs exist, the most common have a traditional electromagnetic design that resembles that of other speaker types. However, tweeters use a smaller cone or dome size due to the smaller wavelength of high frequency audio.