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Constant Directivity End-fire Arrays for Public Address Systems

The directivity of current public address systems can be ensured in mid and high audio frequencies, using arrays and horns. Low frequencies however are often omni-directional. The cardioid subwoofer is introducing itself but has some drawbacks limiting the maximum sound pressure level achievable. As an alternative, the end-fire line array is considered a directive bass system. Previous research already done on end-fire arrays could not rely on our current digital signal processing techniques' potentials since non-existing at the time. Using a digitally processed end-fire array, the possibilities and limitations of these tapered end-fire arrays were examined to create a constant directivity end-fire array with a usable frequency range from 20Hz to 200Hz.

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