The results of a study of the quality of automotive doors as loudspeaker enclosures are presented. Electrical and acoustical measurements of several automotive doors are made and compared to linear box theory. Judgment criteria are considered for quantifying the doors as enclosures and relating that to the sound quality using roughness as one of the criterion. There are obvious limits to the authors' understanding of the above criteria. The tools used in this study are effective for identifying some existing problems in a door design and improving it for that particular application, but limited in giving a general set of design parameters for door design. For instance, there is no clear understanding of the benefit or harm of the Type III reduced resonance type of door enclosure. As system designers the authors are aware of the phenomenon and take advantage of it, but it is also a large source of uncontrolled variability in the design, and potentially a reduction in transient behavior. There is a need for further investigation into the source of the different nonlinear behaviors, which would provide a better model for design and quality assessment. This would include a more detailed assessment of the transient behavior of the different enclosure system. It would include mechanical dynamic behavior data in the form of displacement and acceleration measurements of the doors and trim and source identification through intensity measurements. And it would include the creation of the model. For now the authors have the stated criteria as general guidelines for volume size vs. loudspeaker size, sufficient baffling for at least a 2nd order low frequency response, controlled losses with apparent mass shifts, roughness targets of less than 1 aspers, and the precaution for protecting woofer's behavior in less than ideal enclosures.
Automotive doors as loudspeaker enclosures
2003
29 Seiten, 8 Bilder, 2 Tabellen, 9 Quellen
Conference paper
English
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