Sound Radiation from a Loudspeaker Cabinet using the Boundary Element Method

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    Abstract

    Ideally, the walls of a loudspeaker cabinet are rigid. However, in reality, the cabinet is excited by the vibration of the loudspeaker units and by the acoustic pressure inside the cabinet. The radiation of sound caused by such vibration can influence the overall performance of the loudspeaker, in some cases becoming clearly audible. The aim of this study is to provide a tool that can evaluate the contribution from the cabinet to the overall sound radiated by a loudspeaker. The specific case of a B&O Beolab 9 early prototype has been investigated. An influence by the cabinet of this prototype had been reported, based on subjective testing. This study aims to detect the reported problem. The radiation from the cabinet is calculated using the Boundary Element Method. The analysis examines both the frequency domain and the time domain characteristics (in other words, the steady state response and the impulse response) of the loudspeaker and the cabinet. A significant influence of the cabinet has been detected, which becomes especially apparent in the time domain, during the sound decay process.
    Original languageEnglish
    PublisherDepartment of Acoustic Technology, Technical University of Denmark
    Number of pages116
    Publication statusPublished - 2008

    Bibliographical note

    This Master Thesis was carried out at the Acoustic Technology department, under the supervision of Finn Jacobsen. The project was done in collaboration with Bang & Olufsen, with Sylvain Choisel as the contact person from the company.

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