A New Theater Sound System
B. Passman, J. Ward · Journal of the Society of Motion Picture and Television Engineers · 1951
A fully integrated sound system designed to meet the needs of regular and drive-in theaters, having power requirements ranging from 20 to 280 watts, features standardized chassis and cabinet design, interchangeable power amplifiers and a plug-in preamplifier located in the soundhead. Use of modern circuit techniques and conservative rating of all components afford reliability and rated performance under all conditions.