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Designing Low-Frequency Enhanced Loudspeaker Systems Using a Vibration-Absorber Theory

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A universal design procedure has been developed for enhancing the low-frequency response of loudspeakers ranging from handset loudspeakers to large subwoofers. The procedure attempts to find the optimal parameters of a vented-box system on the basis of the vibration-absorber theory. Simulations and experiments were used to validate the optimal design. Design charts and constrained optimization facilitate the design of the acoustic enclosure. Although limitations do not allow for accurate prediction of responses below 100 Hz, the comparison between closed- and vented-box performance correlates well with the desired bass extension.

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JAES Volume 57 Issue 3 pp. 131-148; March 2009
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Jinwei Feng
Comment posted April 4, 2009 @ 18:18:09 UTC (Comment permalink)

I was expecting to see the comparison curves between the proposed design procedure and the conventional design procedure in terms of the low frequency response. How and why is the new procedure better than the conventional one?

Jinwei Feng


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Mingsian Bai
Comment posted April 7, 2009 @ 18:14:54 UTC (Comment permalink)

Dear Jinwei Feng:
Thank you for your comments on my paper. I shall try to answer you question as follows.
The main purpose of this paper is to suggest a unified optimization procedure for coupled oscillator problem in loudspeaker design. The design examples given in the paper incidentally fit this category. It is really not our intention to replace traditional methods that are widely used in the community of, for example, bass-reflex systems. We simply want to suggest a systematic and automatic alternative, rather than an empirical approach, which enables us to have more control of design parameters and constraints such as the target bass extension frequency. Our method is in fact quite versatile in that it is applicable to not only common vented-box systems but also unorthodox loudspeaker systems, e.g., the resonant loudspeaker presented in this paper. We found it more flexible than the design using some commercial loudspeaker design software in which only a few fixed alignment are available.
I hope I have answered your question satisfactorily. Thank you again for your interest.


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