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HORN PLAYBACK EQUIPMENT
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film reproduced from fixed or portable units, (b) lateral-cut acetate recordings reproduced from fixed or portable units, and (c) vertical cut recordings.
The outputs from each of these sources are amplified to a uniform speech volume before transmission to the playback control unit which is mounted on the stage mixer's console. The mixer is then able properly to control the volume to the horn units, head-phone extensions, and microphone input position. The two-way horn system, used for high or low-level playback, is mounted on a dolly to permit ready movement about the stage or on location, while a Western Electric 7 50A speaker, mounted in a small cabinet, may be connected to the
FIG. 1. Block diagram of stage playback system.
output of the horn console amplifier system when high-quality lowlevel playbacks are needed.
Two-Way Mobile Speaker System. — A front view of the two-way speaker console is shown in Fig. 2. The unit is constructed in two sections: (a) the horn unit, including the two-way speaker system, field supply power unit, dividing network, low-pass filter, extension cable connections, and storage space for accessories, and (b) a fourwheel steerable dolly supporting the horn unit mounting plate, 40watt power amplifier, patching panel and cable reel. The horn unit may readily be separated from the dolly, as shown in Fig. 3, when it is necessary for the horn unit to be used on high parallels or suspended from the ceiling. When mounted as one unit, the two sections are secured together by trunk hasps and a positioning detail. The horn