User manual JBL SYNTHESIS SDEC-1000

[. . . ] SYNTHESIS SDEC-1000/2500 INSTALLATION GUIDE TABLE OF CONTENTS SECTION ___________________________________________________________PAGE 1. 0 _________________________________________________________PRECAUTIONS 5. 5 Important Safeguards for Audio Products _________________________________________7­10 2. 0_____________________________________________INTRODUCTION TO THE SDEC 2. 0 Introduction __________________________________________________________________________11 The Concept __________________________________________________________________________11 2. 1 SDEC-1000 and SDEC-2500 Rear Panels ____________________________________________________12 2. 2 What the SDEC does _________________________________________________________________13­17 Driver EQ ____________________________________________________________________________13 Driver Time Correction __________________________________________________________________14 Channel-to-Channel Distance Correction (Auto-Time Correction)__________________________________15 Crossovers ___________________________________________________________________________15 Screen Correction ______________________________________________________________________16 Modes_______________________________________________________________________________16 Room Correction EQ_________________________________________________________________16­17 3. 0 __________________________________________________INSTALLING THE SDEC 3. 1 Location, Location, Location . ___________________________________________________________18 3. 2 A Note On Wiring ______________________________________________________________________19 3. 3 Wiring Connections to the SDEC________________________________________________________20­22 Case I ­ Replacing an analog equalizer in an existing Synthesis system _________________________20­21 Case II ­ Installing an SDEC as part of a new Synthesis system installation_______________________21­22 Power the system up for the first time ______________________________________________________22 4. 0_______________________________THE DIGITAL ACOUSTIC CALIBRATION SYSTEM 4. 1 Operational Overview ________________________________________________________________23­27 Stimulus _____________________________________________________________________________23 Data Acquisition ____________________________________________________________________23­24 Data Post-Processing ___________________________________________________________________24 Display Data __________________________________________________________________________24 Make Corrections ______________________________________________________________________25 Target Curves ______________________________________________________________________25 Ideal Low-Frequency Response __________________________________________________25­26 Ideal High-Frequency Response __________________________________________________26­27 4. 2 DACS4 Connections and Use __________________________________________________________28­32 Things To Consider When Selecting A Location For DACS4 ______________________________________28 Hookup ______________________________________________________________________________29 AC/Power Connections _______________________________________________________________29 Audio Connections __________________________________________________________________30 Other Connections __________________________________________________________________30 Microphone Connection and Placement _______________________________________________30­32 3 TABLE OF CONTENTS SECTION ___________________________________________________________PAGE Room Placement ________________________________________________________________30 How is the Room Used?________________________________________________________31 Microphone #1 _______________________________________________________________31 Now Place the Remaining Microphones _________________________________________31­32 4. 3 Power Up Synthesis and DACS4 ___________________________________________________________33 4. 4 Preliminary Surround Processor Settings____________________________________________________34 I. Global Settings ______________________________________________________________________34 II. Mode Specific Settings________________________________________________________________34 4. 5 DACS4 Operation ___________________________________________________________________35­40 Notational Conventions__________________________________________________________________35 About Online Help___________________________________________________________________35 [F-1] Help ______________________________________________________________________35 Starting DACS4________________________________________________________________________35 Initial DACS4 Screen_________________________________________________________________36 Enter Customer Information ___________________________________________________________37 Synthesis Model ____________________________________________________________________38 Select a Surround Processor __________________________________________________________38 Center Screen Compensation __________________________________________________________39 Left/Right Compensation _____________________________________________________________39 Confirm DACS4 Connections __________________________________________________________40 4. 6 DACS4 Main Screen _________________________________________________________________41­45 Response Graph _______________________________________________________________________42 Filters at a Glance ______________________________________________________________________42 Individual Filter Control__________________________________________________________________43 Channel and Mode Selection/Status ________________________________________________________43 Overlay Previously Tested Channels ________________________________________________________44 Online Help ___________________________________________________________________________44 Special Function Keys________________________________________________________________44­45 4. 7 Calibration Walk-Through _____________________________________________________________46­56 Auto-Time Correction ___________________________________________________________________47 Cinema, Subwoofer Calibration_________________________________________________________48­50 Setting the Level ____________________________________________________________________49 Auto-Equalization ___________________________________________________________________50 Cinema, Left ­ Center ­ Right Calibration _________________________________________________48­50 Setting the Level ____________________________________________________________________51 Run Auto-EQ_______________________________________________________________________52 Left and Right Ambient Calibration ______________________________________________________52­53 Setting The Level ___________________________________________________________________53 Music Mode Calibration _________________________________________________________________53 4 TABLE OF CONTENTS SECTION ___________________________________________________________PAGE Quitting DACS4________________________________________________________________________54 After A Complete Calibration __________________________________________________________54 Quitting When Some Channels Are Not Accepted___________________________________________54 SDEC Maintenance _____________________________________________________________________54 Using the Loader Utility ______________________________________________________________54 Troubleshooting ____________________________________________________________________55­56 Correcting Hum Problems ____________________________________________________________55 Why Does It Hum In The First Place?_________________________________________________55 What You Can Do During Installation _________________________________________________55 Video Devices ___________________________________________________________________56 5. 0 _______________________________________________________SPECIFICATIONS 5. 0 Specifications _________________________________________________________________________57 6. 0 ___________________________________________INTERCONNECTION DIAGRAMS Synthesis One Interconnection Diagram _____________________________________________________58­59 Synthesis Two and Three Interconnection Diagram ____________________________________________60­61 7. 0 ____________________________________________CONTROL WIRING DIAGRAMS Synthesis One Control Wiring Diagram______________________________________________________62­63 Synthesis Two and Three Control Wiring Diagram _____________________________________________64­65 8. 0 __________________________________________SYNTHESIS LIMITED WARRANTY 6. 0 Synthesis Limited Warranty ______________________________________________________________66 JBL Synthesis SDEC-1000/2500 Installation Guide ©1998 Harman Digital Systems Group "Dolby" and "Pro Logic" are trademarks of Dolby Laboratories. [. . . ] The key premise of room equalization at low frequencies is that the equalization will be used only to correct for excessive energy found in specific room resonances It must not be used to correct for narrow, deep, dips caused by destructive acoustical interference. A measurement made at a single point cannot effectively identify resonances and cannot discriminate against the relatively harmless acoustical interferences. The only effective method of separating room resonances from acoustical interference is to sample the acoustic energy at several points in the room. DACS4 employs five microphones distributed throughout the listening area. When the data acquired from these microphones is spatially averaged, the resultant curve has effectively "averaged out" most of the destructive interference components while still reporting on major room resonances. This is so because acoustical interferences occupy very 23 4. 1 OPERATIONAL OVERVIEW small spaces within the room (will only be seen on a single microphone) while low-frequency resonances will be found over a much larger area. This technique assures that no single-point room anomaly will dominate the measurement unless, of course, it is severe enough to exist at many locations, as resonances tend to do. As you can see in Figure 8, the dips tend to average out, while the peaks get reinforced. Exactly what we want to do. Figure 6: System Response in Five Locations. Lower Trace is the Spatially Averaged Result, Prior to EQ Data Post-Processing: A Microphone Multiplexer (SMM-5) scans the microphones sequentially and forwards the data to the EVP. The data from the individual microphones is spatially averaged into a single block of data. This is a reliable indicator of the average frequency response of the system throughout the listening area. frequency data. 24 4. 1 OPERATIONAL OVERVIEW Display Data: DACS4 uses the laptop computer to display the results of each test. This data is plotted on an X-Y graph in a familiar format, Amplitude vs. In addition to the response data, there is also a "target" response curve present on the same graph. The target curve is specific to the Synthesis model, mode of operation and channel being tested. This allows you to quickly see how far from the ideal you actually are. As additional tests are performed, they can be added to the display at will, allowing comparison between channels. Make Corrections: When you initialize DACS4, you input information about the Synthesis model being calibrated. With this, DACS4 loads configuration information into the SDEC, which customizes it for use with the particular model, whether Cinema only or Cinema + Music, and even compensates when the speakers are placed behind a perforated screen. DACS4 allows manual adjustment of as many as fifteen bands of parametric equalization. To this end, DACS4 incorporates a very sophisticated automatic EQ algorithm. [. . . ] Most equipment racks and the hardware you are installing are painted or anodized. When installing the equipment, file or sand the rack and the panel where they will contact each other until you have a clean, metal to metal contact. Alternatively, you can put an unused external shakeproof lock washer (sometimes called a star washer) between the rack and the panel with each mounting screw. This will cut through the finish as you tighten the hardware. 55 4. 7 CALIBRATION WALK-THROUGH If the SDP-2 surround processor is not being mounted directly to this rack you may need to fabricate a ground strap using 16 or heavier gage stranded wire with crimp-on ring lugs on the ends. [. . . ]