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Open AccessArticle

A Multi-Tone Sound Absorber Based on an Array of Shunted Loudspeakers

Key Laboratory of Modern Acoustics (MOE), Institute of Acoustics, Nanjing University, Nanjing 210093, China
Centre for Audio, Acoustics and Vibration, Faculty of Engineering and IT, University of Technology, Sydney, NSW 2007, Australia
Author to whom correspondence should be addressed.
Appl. Sci. 2018, 8(12), 2484;
Received: 1 November 2018 / Revised: 23 November 2018 / Accepted: 23 November 2018 / Published: 4 December 2018
(This article belongs to the Special Issue Active and Passive Noise Control)
It has been demonstrated that a single shunted loudspeaker can be used as an effective low frequency sound absorber in a duct, but many shunted loudspeakers have to be used in practice for noise reduction or reverberation control in rooms, thus it is necessary to understand the performance of an array of shunted loudspeakers. In this paper, a model for the parallel shunted loudspeaker array for multi-tone sound absorption is proposed based on a modal solution, and then the acoustic properties of a shunted loudspeaker array under normal incidence are investigated using both the modal solution and the finite element method. It was found that each shunted loudspeaker can work almost independently where each unit resonates. Based on the interaction analysis, multi-tone absorbers in low frequency can be achieved by designing multiple shunted loudspeakers with different shunt circuits respectively. The simulation and experimental results show that the normal incidence sound absorption coefficient of the designed absorber has four absorption peaks with values of 0.42, 0.58, 0.80, and 0.84 around 100 Hz, 200 Hz, 300 Hz, and 400 Hz respectively. View Full-Text
Keywords: shunted loudspeaker array; modal solution; multi-tone sound absorption shunted loudspeaker array; modal solution; multi-tone sound absorption
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MDPI and ACS Style

Cong, C.; Tao, J.; Qiu, X. A Multi-Tone Sound Absorber Based on an Array of Shunted Loudspeakers. Appl. Sci. 2018, 8, 2484.

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