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AN IMPROVED HORN PLAYBACK EQUIPMENT' C. R. DAILY**
Summary. — A mobile two-way horn system has been constructed to provide improved quality playbacks to sound-recording stages, the same horn equipment also being useful in connection with high-level announcing systems. The material in this paper covers certain of the mechanical and electrical design features of this horn system, together with brief descriptions of other new portions of the playback system, including an equalized feedback type disk playback amplifier, a playback control system for the production mixer, and a compact and easily handled high-quality speaker for use in connection with the direct recording of low-level playbacks.
Playback equipments serve an important purpose on production stages and the need of high quality in such equipments should be emphasized. All portions of the playback system should be carefully designed to improve the quality and to facilitate their operation on the stages. The need of high-quality disk playbacks is illustrated in the case of direct film recording from low-level playbacks. For this type of work, the director needs to be able quickly and accurately to judge the quality of the recorded take so that he can make a proper selection of the desired take for subsequent use on the same day, using the disk for further high-level playback work. If any portion of the playback equipment produces poor quality, the director is unable to make the proper selection of takes, forcing him to wait until the following day to hear the film takes. This type of delay is costly to production. In the paragraphs to follow, a mobile two-way horn system will be described which serves the dual purpose of providing high quality and sufficient flexibility for use in any production service. Since a new playback control system was needed to go with this horn, a brief description will be given also of some of its component parts, including an equalized-feedback disk reproducing amplifier, playback control box, and a small high-quality horn.
A schematic drawing of a normal recording and playback system is shown in Fig. 1. The sources of playback material may include (a)
* Presented at the 1940 Fall Meeting at Hollywood, Calif. ; received October 15, 1940.
** Paramount Pictures, Inc., Hollywood, Calif.
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