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Improvement in Dome Speaker Characteristics by Using a Spherical Wave Front Horn Baffle

A new baffle shape can be used tosignificantly improve dome speaker performance. Conventionally, a dome speaker is mounted on a flat baffle, such that the sound waves radiating from the diaphragm are subject to reflection, interference and diffraction, resulting in irregular response characteristics. Noting that a dome shaped diaphragm's wavefront is nearly spherical, we decided to use a horn to spread the wavefront without distorting it. With this baffle it is theoretically possible to obtain the equivalent of a pulsating sphere at the opening. In theory, there would be no problems of reflection, interference or diffraction. Using an experimental baffle, we were able to confirm our hypothesis. We were also able to make further improvements in directional and imaging characteristics. Applying this new baffle to a dome speaker we found that it did indeed ameliorate.

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