Compression drivers couple a radiating diaphragm to a horn throat of smaller area, resulting in high efficiency. Commonly a phase plug is used to control the transition from diaphragm to horn in order to improve the high-frequency performance. In this paper a new design method for the positioning of annular phase plug channels is presented in order to improve the driver response.
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https://aes2.org/publications/elibrary-page/?id=14841
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