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Summary of Contents for Dolby Laboratories SDU4
- Page 1 î î î î Model SDU4 Surround Decoder User's Manual Issue 2 MAIN Part No. 91413...
- Page 2 Dolby Laboratories be liable for incidental, special, direct, indirect or consequential damages (including but not limited to damage to software or recorded audio or visual material), or loss of use, revenue or profit even if Dolby Laboratories or its agents have been advised, orally or in writing, of the possibility of such damages.
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Page 3: Table Of Contents
SECTION 1–INTRODUCTION ... 1-1 1.1 The SDU4 ... 1-1 1.2 Specifications ... 1-2 1.3 Regulatory Notices ... 1-3 SECTION 2–INSTALLATION & CALIBRATION ... 2-1 2.1 Monitor Setup ... 2-1 Front Loudspeaker Arrangement ... 2-1 Surround Loudspeakers ... 2-2 Equalization ... 2-2 2.2 Mains Fuse and Voltage Selection ... -
Page 4: Section 1-Introduction
The SDU4 is designed for use with a Dolby Surround encoder, the SEU4. A first step in equipping a post-production facility for future surround productions should be the installation of the SDU4 and the establishment of a correct monitoring environment. -
Page 5: Specifications
22 mm (0.875"). Weight: 5 kg (11 lb.). Power Requirements: The SDU4 consumes about 20 watts and is designed for operation from a centrally switched power source. 230 V version: 198- 264 V ac, 50/60 Hz, uses one 20 mm T250 mA fuse. -
Page 6: Regulatory Notices
Regulatory Notices Troubleshooting must be performed by trained technicians. Do not attempt to service the unit unless you are qualified to do so. WARNING: Check that the units have been set to the correct supply voltage and that the correct fuses have been installed. To reduce the risk of fire, replace the fuses only with the same type and rating. - Page 7 IEC NOTICES This unit complies with the safety standard IEC65. To ensure safe operation and to guard against potential shock hazard or risk of fire, the following must be observed: • Ensure the voltage selector is set to the correct mains voltage for your supply. •...
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Page 8: Section 2–Installation & Calibration
Monitor Setup Front Loudspeaker Arrangement The SDU4 is designed for monitoring rooms with either two or three front loudspeakers. The choice between using either two or three front loudspeakers depends upon the distance between the Left and Right speakers, (how large the stereo image is) and how the primary listening area is arranged relative to the front sound image. -
Page 9: Surround Loudspeakers
Equalization The monitor system used with the SDU4 should have its electro-acoustical frequency response adjusted to conform with international standards for wide- range audio monitoring. This standardized equalization is encouraged, as it allows program material to be interchanged between various monitoring rooms and, ultimately, the viewer’s home, without apparent or objectionable... -
Page 10: 2.2.2 Multi-Voltage Sdu4
For 187 to 264 Vac use T250 mA 20mm time-lag fuse. Audio Connections The SDU4 has been designed to interface with professional audio equipment at commonly found studio operating levels. Connection to and from the unit are made using standard 3-Pin XLR-type connectors. Both the input and output stages are electronically balanced with pin 2 being positive and pin 3 being negative. -
Page 11: External Facilities Connector (J503)
2.3.1 External Facilities Connector (J503) FEMALE D-CONNECTOR +24V +15V -15V DC GROUND Figure 2.4 J503 connections Connector J503 provides fixed level (500mV for Dolby level) monitoring points for Lt and Rt and for L,C,R and S signals, and various remote control functions; see Figure 2.4. -
Page 12: Center Speaker Switch
Cat. No. 344, as shown in Figure 2.5. Center Speaker Switch Switch S301 allows the SDU4 to be installed in monitoring rooms that have either two loudspeakers (labeled “center speaker, no”) or three loudspeakers (“yes”). -
Page 13: Wake-Up Mode Selection
L + .707 (C) Wake-Up Mode Selection The SDU4 can be set to default to any operating mode when power is first turned on. This is set using the internal jumpers J1/J2/J3. See Figure 2.5. The factory setting is Dolby Surround. -
Page 14: Input Level Setting
The delay is set for (20-10) + 20 = 30 milliseconds, switch setting 1. The delay time for each switch setting is: As the SDU4 will frequently be used in small rooms, it is likely that the delay will always be set to the minimum position (0). -
Page 15: Output Level Setting
(0dBr = 0.775V rms.) Output Level Setting The SDU4 contains an internal pink noise generator that allows easy setting of the output level controls and the verification of correct operation of the monitor system. (Always select Dolby Surround mode before using the pink noise generator. -
Page 16: Output Level Adjustments
(usually 85dBc) with one channel at a time being driven with wide-band pink noise. In cases where the SDU4 outputs are routed though a switching system and the outputs from other devices are connected to the power amplifiers, set the SDU4 outputs to an established house reference level (+4dBr, for instance) and make the final monitor level adjustments at the power amplifiers. -
Page 17: Section 3-Operation
Operating Modes and Applications The SDU4 has three modes of normal operation: Mono, Stereo and Dolby Surround. Mono The mono mode combines the Lt and Rt input signals into a single channel and routes it to the Center loudspeaker, if the internal switch S301 is in the "yes"... - Page 18 In audio post-production environments, it is recommended that all stereo material be evaluated through the SDU4 in the Dolby Surround mode as a means of verifying mono compatibility. Conventional monophonic recording, i.e., equal phase at equal level, can be considered a subset of the...
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Page 19: Surround Productions
L and R channels at precisely –3 dB into each. From this point, these two channels are sent to the SDU4 Lt and Rt inputs for decoding into the spatially correct L,C,R and S channels. -
Page 20: Section 4-Block Diagram
REMOTE MODE SELECT MONITOR POINTS J503 J503 CAT. 150 LEVEL METERS (LEDS) LOOP SWITCH MONO SURR MUTE DRIVER FLASHER SDU4 BLOCK DIAGRAM A3B3708 REV 2 LEVEL TRIM LEFT OUTPUT LEVEL TRIM CENTER CENTER SPKR SW OUTPUT LEVEL TRIM RIGHT OUTPUT...
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