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, ICI LskSito t The Dolby 737 Soundtrack Loudness Meter monitors the subjective loudness of trailers and other film soundtracks as they are being prepared. intended for use on soundstages and at optical transfer and film QC facilities, the 737 reads the non-equalized outputs of a cinema processor or mixing console. it can evaluate anything from a trailer or commercial to elements of a feature’s complete soundtrack for comparison purposes, and alerts mixers to the potential for audience complaints about loudness levels when the film is played in the cinema. The 737’s operation is based on the measurement technique known as Leq(m), developed by Dolby Laboratories after extensive research into the perceived loudness of film soundtracks. Unlike conventional audio meters such asVUs and PPMs, the 737 monitors loudness over time—for the entire length of a trailer, scene, or complete feature—and mimics the varying sensitivity of the human ear at different frequencies, taking particular note of those that are most annoying. The 737’s measurement is displayed in decibels that can be interpreted as an “annoyance factor” number. On material with an occasional loud sound, the number will be relatively low, while on material with loud sounds sustained over time the number will be high. in the 737, its six input channels are followed by weighting filters, a true averaging power meter that can be started and stopped remotely, and a trip circuit that indicates a preset maximum level has been exceeded. in addition to showing measurement results on its front panel display, the 737 can drive an external moving-coil meter or chart recorder. Use of the Dolby® 737 meter has contributed to the adoption of loudness standards for trailers and commercials in most areas throughout the world, a reduction in the number of audience complaints, and an improved moviegoing experience. Dolby 7Э7 Soundtrack Loudness Meter 737 Front Panel • □□Dolby Soundtrack Loudness Meter - Leq (m) Modal 737 uqC*) * Cat Start Stop Tl4> ТПР _ * *4 - 2 LCRLsRaSvMon • • 9 * Дс - îi ‘ö* A • .*• А А A 1 r" üT ' £ • Push-Button Controls Calibrate, Start, Stop Leq(m) LED Display Two-digit LED shows current and final Leq(m) value Trip LED Indicates when preset maximum Leq(m) value is exceeded Trip Set 16-position, screwdriver-adjustment for setting trip level Calibration LEDs For setting input levels Input Trimpots Six trimpots for input level calibration 737 Rear Panel C€ Center ® Anelog Audio Inputs Right Left Surround Right Surround Ch 1—-Lt^Ch2 W Ch 3— Dolby and the double-D symbol are trademarks of Dolby Laboratoriea. ® Model 737 able parte inside. Refer al service to qualified Analog Audio Inputs 6 x 3-pin female XLR connectors, balanced: L, C, R, Ls, Rs, SW Sensitivity: -10 to +12 dBu Impedance: 30 k^, 220 pF Input Range: 72-95 dB-Leq(m) Monitor Output 3-pin XLR male connector, unbalanced Measurement mode: mono mix, weighted by filters Calibration mode: mono mix, unweighted Impedance: 100^ Level: 0 dBu nominal, adjustable from -20 to 0 dBu for Dolby level Maximum level: +20 dBu DC Output 3-pin XLR male connector, unbalanced, for driving external meter or chart recorder Operating range: 0-1.25 VDC; 0 VDC corresponds to 70 Leq(m) Output resistance: 1 Power/Control 8-pin pluggable screw terminal connector Trip indicator: open collector output; 100 mA max to ground for tripped, 24 VDC max for not tripped Start/Stop command: open circuit for Start, ground for Stop, maximum open circuit leakage 100 ^A; the unit sources 1 mA when held low (Stop) Power supply: 24 VAC, 500 mA Measurement Accuracy Weighting filter: (m)-weighting, ±0.5 dB, 30 Hz to 16 kHz Measurement: ±0.25 dB, within the range of 75-90 dB-Leq(m) LED display: ±1 digit Trip Indicator Range 78-92 dB-Leq(m), adjustable Measurement Time Maximum measurement length: 10 hours Power Requirements 100 to 135 VAC using external power transformer shipped with unit to 110 V countries, 200 to 240 VAC with transformer shipped to 230 V countries, 10 W Dimensions and Weight 44 x 483 x 267 mm (1.75 x 19 x 10.5 inches) Net: 3.9 kg (8.5 lb) Environmental Conditions 10° to 40°C (50° to 104°F); natural convection cooling 90% maximum relative humidity (noncondensing) Nonoperating (storage): 0° to 70°C (32° to 158°F) Regulatory Notices US: This unit complies with the limits for a Class A digital device, pursuant to Part 15 of the FCC Rules. Europe: This product complies with the requirements of Low Voltage Directive 73/23/EEC and EMC Directive 89/336/EEC and carries the CE marking accordingly. Warranty One-year limited parts and labor; see disclaimer. Specifications subject to change without notice. Reference Are Movies Too Loud? loan Allen, SMPTE Journal, (March 22, 1997); also available at Disclaimer ofWarranties Equipment manufactured by Dolby Laboratories iswarranted against defects in materials and workmanship for a period ofone year from the da...