Optimally sensitive and efficient compact loudspeakers

Research output: Contribution to journalArticleAcademicpeer-review

11 Citations (Scopus)

Abstract

In conventional loudspeaker system design, the force factor Bl is chosen in relation to enclosure volume, cone diameter, and moving mass to yield a flat response over a specified frequency range. For small-cabinet loudspeakers such a design is quite inefficient. This is shown by calculating the efficiency and voltage sensitivity. The frequency response is manipulated electronically in a strong nonlinear fashion, which has consequences for the sound quality, but it then turns out that systems using much lower force factors can provide greater usable efficiency, at least over a limited frequency range. For these low-force-factor loudspeakers, a practically relevant and analytically tractable optimality criterion, involving the loudspeaker parameters, will be defined. This can be especially valuable in designing very compact loudspeaker systems. An experimental example of such a design is described. This new, optimal design has a much higher power efficiency as well as a higher voltage sensitivity than current bass drivers, while the cabinet can be much smaller.
Original languageEnglish
Pages (from-to)890-896
Number of pages7
JournalJournal of the Acoustical Society of America
Volume119
Issue number2
DOIs
Publication statusPublished - 2006

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loudspeakers
frequency ranges
power efficiency
enclosure
systems engineering
frequency response
high voltages
cones
acoustics
electric potential

Cite this

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abstract = "In conventional loudspeaker system design, the force factor Bl is chosen in relation to enclosure volume, cone diameter, and moving mass to yield a flat response over a specified frequency range. For small-cabinet loudspeakers such a design is quite inefficient. This is shown by calculating the efficiency and voltage sensitivity. The frequency response is manipulated electronically in a strong nonlinear fashion, which has consequences for the sound quality, but it then turns out that systems using much lower force factors can provide greater usable efficiency, at least over a limited frequency range. For these low-force-factor loudspeakers, a practically relevant and analytically tractable optimality criterion, involving the loudspeaker parameters, will be defined. This can be especially valuable in designing very compact loudspeaker systems. An experimental example of such a design is described. This new, optimal design has a much higher power efficiency as well as a higher voltage sensitivity than current bass drivers, while the cabinet can be much smaller.",
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Optimally sensitive and efficient compact loudspeakers. / Aarts, R.M.

In: Journal of the Acoustical Society of America, Vol. 119, No. 2, 2006, p. 890-896.

Research output: Contribution to journalArticleAcademicpeer-review

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