To obtain reasonable output from a loudspeaker, we must vibrate large amounts of air. For this, we must usually have fairly large vibrating surfaces, such as the cones in woofers. The larger the cone surface, the greater the output. But the tweeter's cone (diaphragm) must be small to attain its high-frequency response. Thus only a small amount of air can be moved, reducing the output power.

We can increase the acoustic output from any type of diaphragm if we couple directly to a horn, converting the system to a horn-loaded one. Fig. 4.28 shows the relative difference in size between the diaphragms of a cone-type tweeter and a horn-loaded one. The driving force of the voice coil of the latter is distributed between the small ...

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