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THREE-DIMENSIONAL MOTION PICTURES 175 Tc handle this tremendous power output three huge de luxe loudspeaker systems are located on the left center, and right side of the stage. Each setup has 4 large folded type low-frequency baffles with 8 low-fre quency speaker units, and one large cellular high-fre quency horn with special throat and 4 high-frequency speaker units. This gives a total of 36 de luxe speaker units on the stage! Two additional 50-watt power amplifiers are con nected to the driver amplifier on the two side channels through suitable attenuator pads. Each of these ampli fiers drives 22 small cabinet-type loudspeakers that are distributed about the auditorium. The fourth, or control, track recording on the sound film automatically controls the gain of the three varia ble gain amplifiers in the three main amplifier chan nels and hence automatically controls the loudness of the reproduction from each of the speaker set-ups. The control track is a recording of three different artificial oscillator tones of varying intensities superimposed on one another. The three tones are amplified by the con trol track pre-amplifier, then further by the amplifiers in the control track, and finally passed into filters which separate the tones from one another and feed each to the proper variable-gain amplifier. The gain, or "volume-control setting," of the variable- gain amplifier is determined by the strength of the control tone that reaches it. Hence, by increasing the intensity of one control tone with respect to the others on the soundtrack it is possible to make the gain of one amplifier channel greater than the others and the re production from one set of speakers louder than the others. With this brief description of the function of the Fantasound system let us see how it is possible to get more realistic reproduction than can be obtained with a standard system. A recording of a symphony orchestra reproduced by