Dolby Laboratories 737 3.5.1 Alignment

Model 737 Soundtrack Loudness Meter - Leq(m) Cat. No. 448B Input Adapter Board

3-6

3.5.1 Alignment

1. Set the DS4-E into Discrete mode (one green LED).

2. Send tone at Dolby Level to the studio monitor bus and align the Model 737 as

described in Section 2.3.6 - Calibration Procedure (Dolby Digital).

Note: If LK1-4 are in the lower position, the L & C input trimpots on the

Model 737 will be reversed.

3. Set the DS4-E into Matrix Monitor mode with the SR/A or Proc 2 switch not

illuminated.

4. Ensure the DS4-E meter is in direct mode (rear toggle switch up) and the red

rotary switch on the Cat. No. 291 of the DS4-E is set to Lt/Rt position.

5. Send tone at Dolby Level to Lt/Rt (-6 dB on DS4-E meter) and check Model 737

for 85 per channel.

6. Select SR on the DS4-E (SR/A or Proc 2 switch illuminated) and check Model 737

for 88 per channel.

7. Place the DS4-E meter to Monitor position (rear toggle switch in down position)

and adjust the rear trim pots on the meter for -6 dB per channel (the DS4-E must

be in SR mode).

8. Thread up and play a length of Cat. No. 69T and insure alignment of Cat.

No. 240A.

9. Set the DS4-E in Matrix, A, and Optical mode and adjust RV1(L) and RV2(R)

for a null point of 85 per channel on the Model 737.

10. Set the DS4-E in Matrix, SR, and Optical mode and check that the Model 737

reads 3 dB higher on each channel.

MAIN

Contents

Main Dolby Laboratories Inc Table of Contents List of Figures List of Tables Chapter 1 Introduction Chapter 2 Operation and Features Chapter 3 Cat. No. 448B Input Adapter Board Chapter 4 Specifications Appendix A Background List of Figures List of Tables Chapter 1 Introduction Chapter 2 Operation and Features 2.1 Front Panel Controls 6/4 - 2 channel switch Start Trip Set Cal 2.1.1 6/4 2 Channel Switch 2.1.2 Input Trimpots 2.1.3 Trip Set 2.1.4 Pushbuttons Model 737 Soundtrack Loudness Meter - Leq(m) Operation and Features 2.2 Back Panel Connectors Figure 2-3 Model 737 back panel 2.2.1 Analog Audio Inputs Figure 2-4 Audio input connectors (detail of rear panel) The XLR input connectors for channels 16 use the following wiring convention: 2.2.2 Mon Out 2.2.3 DC Out 2.2.4 Power and Control 2.3 Connection and Calibration 2.3.1 Connecting to an Audio Console 2.3.2 Connecting to a Dolby Cinema Processor 2.3.3 Connecting to a DA10/20 Digital Adapter 2.3.4 Connecting to Non-Dolby Digital Adapters 2.3.5 Connecting to the SDU4 Surround Decoder 2.3.6 Calibration Procedure 2.3.7 Automated Input Adapter Board (Cat. No. 448B) 2.4 Mains Power 2.5 Interface 2.5.1 Grounding Model 737 Soundtrack Loudness Meter - Leq(m) Operation and Features 2-10 2.6 Block diagram Figure 2-6 Model 737 block diagram L/Lt C Ls R/Rt Sub Rs Page Chapter 3 Cat. No. 448B Input Adapter Board 3.1 Introduction 3.2 Logic map Model 737 Soundtrack Loudness Meter - Leq(m) Cat. No. 448B Input Adapter Board 3-2 3.3 Component and Connector Layout x2 (Lt/Rt - opt) CAT. NO. 448B Cat. No. 448B Figure 3-1 Cat. No. 448B Interface Adapter 3.4.3 Alignment 3.5 Dubbing studio Page 3.5.1 Alignment Page Chapter 4 Specifications Temperature and Humidity EMC Limits General Appendix A Background A.1 Loudness A.1.1 The Current Situation Page A.2 How Loud Is a Movie? A.3 Standardizing a Measurement Technique for Soundtrack Loudness A.3.1 Alternative Measurement Indices A.4 Analysis of the Data Page Model 737 Soundtrack Loudness Meter - Leq(m) Background A-8 Figure A-5 Comparison of Leq(m) and peak levels Shine demo 1 (Rach. III) Leq CCIR-weighted Peak Level C-weighted, fast 5.6 dB offset dB A.4.1 Verification of the Data Leq CCIR-weighted Peak Level C-weighted, fast