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1000 FREQUENCY 16-mm equipment 16-mm projectors 30 degrees ACADEMY RESEARCH COUNCIL acoustical American Standards Association amplitude amplitude modulation antiresonance aural observation axis azimuth angle characteristic of amplifier characteristic of loudspeaker components CYCLES PER SECOND decibels determine directional characteristic dynamic range film record film speed FILM VOLUME CONTROL FREQUENCY IN CYCLES frequency range greater high frequencies high-frequency impedance jector loud loudspeaker measure low frequencies low-frequency maximum undistorted power MEGOHMS modulation neutral density filter noise level obtained oscillator over-all performance over-all response-frequency characteristic percent phototube circuit picture aperture power-handling capacity PRINT OF ACADEMY Projector F projector sound-reproducing system projectors tested rated reduce REDUCTION PRINT reference level reproduced speech requirements resistive load resistor response curve SECOND Figure signal-to-noise ratio sound-level meter sound-on-film speaker specified speech and music test film tion TONE CONTROL SET total harmonic distortion tubes undistorted power output uniform response variations in response voice coil voltage