Journal of the Society of Motion Picture Engineers ( Volume: 49, Issue: 5, November 1947)

[ACTIVE]

Portable and Semiportable Loudspeaker Systems for Reproducing 16-MM Sound on Film

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Publisher: SMPTE
Doc Type: Journal Article
Article Type: research-article
Abstract: This paper describes three types of loudspeaker systems which have been designed for 16-mm sound on film reproduction. One system uses a dia-cone speaker mounted in a portable leatherette carrying case. A 12-inch speaker is used and the acoustic radiation is obtained from two diaphragms attached to a single voice coil. The outer diaphragm is of the molded-cone type and the inner is a domed dural type of diaphragm which is attached at its edges to the 3-inch voice coil. A second system is mounted in a portable cabinet which has 3.2 cubic feet and is resonated for maximum response down to 85 cycles. The speaker is of the 15-inch type and of similar construction to the 12-inch with the addition of a 6-cell multicellular horn mounted directly in front of the 3-inch dural diaphragm. The third system consists of a duplex speaker and is intended for permanent and semipermanent installations.
Publication Date: 1947-11-01
DOI: 10.5594/J12675
Link: https://doi.org/10.5594/J12675
Author(s): John K. Hilliard

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John K. Hilliard; Portable and Semiportable Loudspeaker Systems for Reproducing 16-MM Sound on Film, Journal of the Society of Motion Picture Engineers ( Volume: 49, Issue: 5, November 1947); SMPTE, 1947. Available at https://doi.org/10.5594/J12675

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John K. Hilliard; Portable and Semiportable Loudspeaker Systems for Reproducing 16-MM Sound on Film, Journal of the Society of Motion Picture Engineers ( Volume: 49, Issue: 5, November 1947); SMPTE, 1947. Available at https://doi.org/10.5594/J12675

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<span class="citation">John K. Hilliard; <cite>Portable and Semiportable Loudspeaker Systems for Reproducing 16-MM Sound on Film</cite>, Journal of the Society of Motion Picture Engineers ( Volume: 49, Issue: 5, November 1947); SMPTE, 1947. Available at <a href="https://doi.org/10.5594/J12675" target="_blank" rel="noopener">https://doi.org/10.5594/J12675</a></span>

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<li>
John K. Hilliard; <cite id="bib-10-5594-j12675">Portable and Semiportable Loudspeaker Systems for Reproducing 16-MM Sound on Film</cite>, Journal of the Society of Motion Picture Engineers ( Volume: 49, Issue: 5, November 1947); SMPTE, 1947
<span class="doi">10.5594/J12675</span>
</li>