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Nonlinearity of Ported Loudspeaker Enclosures

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This paper presents the results of a computational fluid dynamics analysis of an unlined ported enclosure, focusing on the behavior around the tuning frequency. The work presents results for the amplitude dependence of the behavior and the time development of the sound field. The results indicate that the vortex formation around the port ends has a significant effect already at a relatively low flow velocities, and that the nonlinearity of the port is clearly visible in the acoustical load seen by the driver at the resonance frequency.

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AES - Audio Engineering Society