Dolby Laboratories SDU4 User Manual

îîîîModel SDU4Surround DecoderUser's ManualIssue 2 Part No. 91413MAIN

2-32.2.2 Multi-Voltage SDU4OPEN THEDOORSPARE FUSE(UPPER)FUSEACTIVEFUSE CARRIER(LOWER)FUSEOCTAGONAL PEGROUND PEGVOLTAGE SELECTORWHEELA2F4037Figure 2.3

2-42.3.1 External Facilities Connector (J503)+24VDC GROUNDCHASSIS GROUNDSURROUND MONITORRIGHT MONITORCENTER MONITORLEFT MONITORMONOSTEREODOLBY SURROUN

2-5controls are on the right-hand module, Cat. No. 344, as shown in Figure 2.5.Figure 2.5 Cat. No. 344Center Speaker SwitchSwitch S301 allows the SDU

2-6SDU4 OUTPUTS—CENTER LOUDSPEAKER SWITCH SET TO “NO”Mode Left Right SurroundMono .707 (Lt & Rt) .707 (Lt & Rt) —Stereo Lt Rt —Dolby Surround

2-7The delay setting can be estimated by using the following method:1. Estimate the distance between the primary listening location and thenearest sur

2-8The SDU4 contains two four element LED calibration indicators for setting ofinput level.The two input level potentiometers are set so that referenc

2-9RCL SOUTPUTLCRSOFFCSCSNOISE SEQUENCEAUTOMANUALPINK NOISEFigure 2.9 Pink-noise calibrate functionsOutput Level AdjustmentsOutput potentiometers

3-1SECTION 3OPERATION3.1 Operating Modes and ApplicationsThe SDU4 has three modes of normal operation: Mono, Stereo and DolbySurround.MonoThe mono mod

3-2The matrix format used on Dolby soundtracks is compatible with bothmonophonic and conventional stereo playback.Many home viewers have purchased Dol

3-3center channel information. This, in effect, will cause the mono-compatibleelements of the mix to appear to always come from the center of the pict

User's ManualModel SDU4Surround DecoderDolby Laboratories IncorporatedU.S.A. 100 Potrero Avenue, San Francisco, CA 94103-4813Tel: 415-558-0200;

4-1SECTION 4BLOCK DIAGRAMPIN 14 = CHASSIS3 = LO2 = HI1 = CHASSISNCNCNCREMOTERT RSLTLCPOWER-ONMODE SELECTDOLBYAUTOMANUAL11TO REMOTE FADER1SELECTFADERCO

iTABLE OF CONTENTSSECTION 1–INTRODUCTION... 1-11.1 The SDU4

1-1SECTION 1INTRODUCTION1.1 The SDU4The Dolby SDU4 is designed for reference monitoring of Dolby encodedfilm formats or Dolby Surround program materia

1-21.2 SpecificationsLayout:Rack-mount unit incorporating aprofessional surround decoder module,interface circuitry, and power supply.Signal Connectio

1-31.3 Regulatory NoticesULTroubleshooting must be performed by trained technicians. Do not attemptto service the unit unless you are qualified to do

1-4IMPORTANT SAFETY NOTICEThis unit complies with the safety standard IEC65. To ensure safe operation and to guardagainst potential shock hazard or r

2-1SECTION 2INSTALLATION AND CALIBRATION2.1 Monitor SetupFront Loudspeaker ArrangementThe SDU4 is designed for monitoring rooms with either two or thr

2-2Surround LoudspeakersThe surround loudspeakers are used to distribute a single channel of sound ina diffuse field behind the viewer. The number of