Journal of the Society of Motion Picture Engineers ( Volume: 34, Issue: 4, April 1940)

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The Adjustable Equalizer as a Tool for Selecting Best Response Characteristics

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Publisher: SMPTE
Doc Type: Journal Article
Article Type: research-article
Abstract: That the problem of manipulating the response characteristics of sound reproducing systems in theaters has been significant is attested by the current practice of equipment companies of providing a variety of response adjustments as part of their standard equipments. However, prior to the establishment of this practice several thousand installations had been made. Continuation of the use of those systems presents a service organization with the problem of determining as expeditiously as possible the optimum response characteristic in specific cases. The paper which follows describes the design of an adjustable equalizer system to permit selecting quickly, through dial switch adjustments at the listening point in the auditorium, any one of some twenty billion theoretically possible response characteristics. The paper describes the circuits employed and sets forth the reasons which underlie the choice of particular configurations. The accompanying illustrations show the several generalised types of component curves from which the overall insertion effect of any combination of settings may be predicted. For each of the types of sound systems most commonly encountered the method of insertion and the considerations governing the insertion of the adjustable equalizer are given. The paper concludes with a brief discussion of the types of problems whose solution has been facilitated through the availability and use of the adjustable equalizer.
Publication Date: 1940-04-01
DOI: 10.5594/J14627
Link: https://doi.org/10.5594/J14627
Author(s): E. S. Seeley

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E. S. Seeley; The Adjustable Equalizer as a Tool for Selecting Best Response Characteristics, Journal of the Society of Motion Picture Engineers ( Volume: 34, Issue: 4, April 1940); SMPTE, 1940. Available at https://doi.org/10.5594/J14627

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E. S. Seeley; The Adjustable Equalizer as a Tool for Selecting Best Response Characteristics, Journal of the Society of Motion Picture Engineers ( Volume: 34, Issue: 4, April 1940); SMPTE, 1940. Available at https://doi.org/10.5594/J14627

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<span class="citation">E. S. Seeley; <cite>The Adjustable Equalizer as a Tool for Selecting Best Response Characteristics</cite>, Journal of the Society of Motion Picture Engineers ( Volume: 34, Issue: 4, April 1940); SMPTE, 1940. Available at <a href="https://doi.org/10.5594/J14627" target="_blank" rel="noopener">https://doi.org/10.5594/J14627</a></span>

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<li>
E. S. Seeley; <cite id="bib-10-5594-j14627">The Adjustable Equalizer as a Tool for Selecting Best Response Characteristics</cite>, Journal of the Society of Motion Picture Engineers ( Volume: 34, Issue: 4, April 1940); SMPTE, 1940
<span class="doi">10.5594/J14627</span>
</li>