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Using diffraction...
At high frequencies the radiation of sound is controlled by the diffraction edges. From approximately 7 kHz the diffraction edges begin to work. At the very high frequencies the DXT® uses up to 3rd order diffraction to expand the sound field.
In the mid-band frequencies the diffraction edges are ”invisible” and the DXT works like an ordinary wave-guide to narrow the mid-band dispersion.
By carefully selecting proper frequency range for the wave-guide and diffraction edges, it is possible to design a loudspeaker with perfect power response.
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