At its fundamental resonance frequency, the conversion efficiency of a direct-radiator loudspeaker can be substantially greater than its rated efficiency. The behavior of a movingcoil direct-radiator loudspeaker near resonance is analyzed and ways are suggested in which this behavior might be used to increase the sensitivity of closed-box low-frequency loudspeaker systems.
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https://aes2.org/publications/elibrary-page/?id=13413
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