The differences between ribbon loudspeakers and conventional loudspeakers are outlined. A survey is given of some characteristic properties of modern ribbon tweeters. The operating principle can be described with the aid of simple model based on a stretched membrane loaded with an air spring. From the model design rules can be derived. In this way it is possible to give prescriptions for making a compact midrange tweeter driver, having an extended frequency range compared with earlier ribbon tweeters. Measurements on recently developed midrange tweeter units show a frequency range of about 800-30000 Hz, low distortion, good sensitivity, and good transient response.
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