Technology / Home Audio / Constant Directivity (Cd) Horn: A horn-loaded high frequency driver that exhibits more or less constant distribution of high-frequency sound in the horizontal direction. This is done by using one of several special dual shaped horn designs created to solve the traditional problem of horn-loaded driver output varying with frequency. All CD horns exhibit a high frequency roll-off of approximately 6 db/octave beginning somewhere in the 2 khz to 4 khz area.
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