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Related Manuals for JBL SYNTHESIS SDEC-1000
Summary of Contents for JBL SYNTHESIS SDEC-1000
- Page 1 SYNTHESIS SDEC-1000/2500 INSTALLATION GUIDE...
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Page 3: Table Of Contents
TABLE CONTENTS SECTION ___________________________________________________________PAGE 1.0 _________________________________________________________PRECAUTIONS 5.5 Important Safeguards for Audio Products _________________________________________7–10 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 _________________________________________________________________13–17 Driver EQ ____________________________________________________________________________13 Driver Time Correction __________________________________________________________________14 Channel-to-Channel Distance Correction (Auto-Time Correction)__________________________________15 Crossovers ___________________________________________________________________________15 Screen Correction ______________________________________________________________________16... - Page 4 TABLE CONTENTS SECTION ___________________________________________________________PAGE Room Placement ________________________________________________________________30 How is the Room Used?________________________________________________________31 Microphone #1 _______________________________________________________________31 Now Place the Remaining Microphones _________________________________________31–32 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 ___________________________________________________________________35–40 Notational Conventions__________________________________________________________________35 About Online Help___________________________________________________________________35...
- Page 5 1992–1997 Dolby Laboratories, Inc. All Rights Reserved THX is a registered trademark of Lucasfilm, Ltd. JBL and Synthesis are registered trademarks of JBL Incorporated. All Rights Reserved Design and digital production by Harman Digital Systems Group Design and Production Center, Woodbury, New York...
- Page 6 TABLE Figures Figure 1: Raw Driver Response/Corrected Driver Response _________________________________________13 Figure 2: System With & Without Driver Time Correction___________________________________________14 Figure 3: Effect of Auto-Time Correction ________________________________________________________15 Figure 4: Effect of Screen Correction EQ ________________________________________________________16 Figure 5: Effect of Room EQ _________________________________________________________________17 Figure 6: System Response In 5 Locations ______________________________________________________26 Figure 7: Synthesis 1 Main Target Curve, Below 1kHz______________________________________________28 Figure 8: Complete Synthesis 1 Target Curve ____________________________________________________29...
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Page 7: Important Safeguards For Audio Products
IMPORTANT SAFEGUARDS PRECAUTIONS 1.1 Important Safeguards 9. Heat – The product should be situated away from heat sources such as radiators, heat registers, For Audio Products stoves, or other products that produce heat. If placed near an amplifier, check with the PLEASE READ CAREFULLY ALL THE manufacturer for applicability. - Page 8 IMPORTANT SAFEGUARDS ANTENNA LEAD-IN WIRE Example of Antenna Grounding as per National Electrical Code ANTENNA DISCHARGE UNIT (NEC SECTION 810-20) GROUNDING CONDUCTORS (NEC SECTION 810-21) GROUND CLAMPS POWER SERVICE GROUNDING ELECTRODE SYSTEM (NEC ART 250, PART H) 15. Nonuse Periods – The power cord of the prod- a.
- Page 9 Español Deutsch Wichtige Sicherheitsanweisungen Instrucciones importantes de sequiridad Heben Sie sich diese Sicherheitsanweisungen auch für später auf. Guarde esta instrucciones para uso posterior. Befolgen Sie alle auf der Vorrichtung stehenden Anweisungen und Warnungen. Utilice siempre el voltaje correcto. Diríjase a las instrucciones de operación del fabricante para obtener las especificaciones de potencia.
- Page 10 Dansk Suomi Vigtig information om sikkerhed Tärkeitä varten Gem denne vejledning til senere brug. Säilytä nämä ohjeet tulevaa käyttoöä varten. Følg all anvisninger og advaresler på apparatet. Seuraa kaikkia yksikköön merkittyjä ohjeita ja varoituksia. Apparatet skal altid tilslttes den korrekte spænding. Der henvises til brugsanvis- Käytä...
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Page 11: Introduction
Introduction: From its inception, JBL Synthesis has been the answer to the questions: “How do you build a state-of-the-art home theater system and make it sound superb in every installation? How can you be sure all the hardware is compatible?” These were the big questions five years ago –... -
Page 12: Sdec-1000 And Sdec-2500 Rear Panels
SDEC-1000 REAR PANEL SDEC-2500 REAR PANEL SDEC-1000 Rear Panel SDEC-2500 Rear Panel System connection after dealer installation and calibration. -
Page 13: What The Sdec Does
Tell the system during installation whether it’s a Synthesis I, II, or III and corrections, programmed at the factory by JBL engineers, are instantly applied to make very good drivers sound even better. -
Page 14: Driver Time Correction
WHAT THE SDEC DOES Driver Time Correction: Once again, because the SDEC “knows” what speakers it’s being used with, it can correct for the different arrival times of sounds from low- and high-frequency drivers. Arrival times are slightly different because the horns, tweeters, and midrange drivers are mounted at somewhat different distances from the listener. -
Page 15: Channel-To-Channel Distance Correction (Auto-Time Correction)
WHAT THE SDEC DOES Channel to Channel Distance Correction (Auto-Time Correction): The listener’s preferred listening location doesn’t always coincide with the “acoustically best” position; furniture place- ment, screen location, traffic patterns and other factors can keep us from sitting where “sound sounds best”, typically determined by speaker placement geometry. -
Page 16: Screen Correction
WHAT THE SDEC DOES Screen Correction: The computational power of the SDEC allows it to compensate for the effects of placing the front center channel loudspeaker behind any of several popular types of projection perforated screen material. Figure 4: Effect of Screen Correction EQ Modes: Although not a major consideration before the advent of home theater, inherent differences exist between an idealized music-only and an idealized cinema sound reproduction system. -
Page 17: Figure 5: Effect Of Room Eq
In this case, however, a preprogrammed computer, using proprietary algorithms developed over a period of several years by JBL, guides the automatic adjustment process, transforming acoustic torture chambers into acoustically superior environments. The essential ingredient necessary for success is knowledge of what can and cannot be corrected with equalization. -
Page 18: Location, Location, Location
Location, location, location… (Please note that this installation guide assumes a U.S. location, in which the power source is 120 volt, 60Hz. JBL can supply the SDEC for use in 230 volt, 50Hz environments on special order. Contact JBL for details and delivery information.) Pick a location, determined by the relationship to other equipment and power availability. -
Page 19: A Note On Wiring
A NOTE ON WIRING A note on wiring: There are four types of wiring systems associated with all Synthesis systems: • Signal wiring: RCA-to-RCA type interconnects will serve to route analog audio signals between the surround processor, the SDEC and the power amplifiers. Only high-performance interconnects should be used. A pre-fabricated set of cables is provided with the SDEC. -
Page 20: Wiring Connections To The Sdec
WIRING CONNECTIONS TO THE SDEC Wiring Connections to the SDEC: Case I – Replacing an analog equalizer in an existing Synthesis system: • Turn all equipment OFF and disconnect the AC power before beginning. • Disconnect and remove the analog equalizers and all associated equipment, wiring and hardware. •... -
Page 21: Case Ii - Installing An Sdec As Part Of A New Synthesis System Installation
WIRING CONNECTIONS TO THE SDEC • The first time SDEC is powered, it may take up to 30 seconds to “boot”. After system calibration is complete, boot time is reduced to about ten seconds. When boot is complete, the red light around the power switch goes off, and an amber LED in the center of the front panel comes on. -
Page 22: Power The System Up For The First Time
WIRING CONNECTIONS TO THE SDEC • Turn on all equipment except the surround processor. At this time all Synthesis components should remain in standby. • Now turn on the surround processor. After a few seconds, the Synthesis components should power up. First, the SDEC will go from standby to on, followed by the amplifiers, one channel at a time. -
Page 23: Operational Overview
When the physical installation of any Synthesis System is complete, the next step is to calibrate the system to meet factory performance specifications. This is accomplished with the use of the proprietary JBL Synthesis Digital Acoustic Calibration System (DACS4). DACS4 is a computer controlled acoustic measurement system that communicates directly with the SDEC-1000/2500. -
Page 24: Data Post-Processing
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. -
Page 25: Display Data
To do so only results in a thin bass sound. By surveying many listening rooms over the years, JBL engineers have established a low-frequency response characteristic that delivers the most consistently satisfactory results. This has been confirmed through extensive... -
Page 26: Ideal High-Frequency Response
OPERATIONAL OVERVIEW Figure 7: Synthesis 1 Main Target Curve, Below 1kHz • Ideal High-Frequency Response Above a few hundred Hz, the perception of sound quality, or timber, is determined by a complex combination of the direct sound – the first arrival at the listener’s ears, the early reflected sounds – those sounds that have reflected from the floor, ceiling and the side walls, and the reverberant sounds –... -
Page 27: Figure 8: Complete Synthesis 1 Target Curve
OPERATIONAL OVERVIEW The fact that the “room curve” is not perfectly flat should not be upsetting. One would expect a gentle high- frequency rolloff from even the most perfect loudspeaker. The absorption of high frequencies by drapes, carpets, upholstered furniture, etc. ensures that not all of the radiated energy reaches the listener, or microphone. it is much the same in recording studios, so this is part of the normal playback circumstances. -
Page 28: Dacs4 Connections And Use
If this is not so, please refer to the system installation documentation. It is also assumed that the installation uses standard Synthesis components in a standard five-channel + subwoofer con- figuration. If this is not so, please refer to alternate configuration documentation or call your JBL Synthesis representative for specific instructions. -
Page 29: Hookup
DACS4 CONNECTIONS AND USE Hookup: Use the following diagram to connect the DACS4 system to Synthesis: Figure 9: DACS4 Connection to Synthesis • AC/Power Connections The EVP-1 and the laptop computer use in-line power supplies. Connect these power supplies to their respective devices before you connect them to the AC supply. -
Page 30: Audio Connections
DACS4 CONNECTIONS AND USE • Audio Connections On the front panel of the EVP-1 are two RCA connectors labeled “RIGHT OUT” and “LEFT OUT”. Using the stereo 25' RCA cable provided, connect these outputs to the “AUX” input of the surround processor. •... -
Page 31: How Is The Room Used
DACS4 CONNECTIONS AND USE How is the Room Used? Before you can decide microphone placement, you must know how the customer expects to use the room. This is best determined by asking the customer some key questions. For example, ask if they typically enter- tain several guests when using the theater room. - Page 32 DACS4 CONNECTIONS AND USE Figure 9: DACS4 Connection to Synthesis • AC/Power Connections The EVP-1 and the laptop computer use in-line power supplies. Connect these power supplies to their respective devices before you connect them to the AC supply. The power connector for the EVP-1 is located on the left side of the front panel while the connector for the laptop computer is located on the right side of the computer’s rear panel.
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Page 33: Power Up Synthesis And Dacs4
POWER UP SYNTHESIS AND DACS4 Power Up Synthesis and DACS4: After you have completed the connections described above, you are ready to power up Synthesis and DACS4. At this point, the Synthesis system and the laptop computer should be off. The EVP-1, which has no power switch, should already be on, as indicated by the red LED on the rear panel. -
Page 34: Preliminary Surround Processor Settings
PRELIMINARY SURROUND PROCESSOR SETTINGS Preliminary Surround Processor Settings: If this is the first time the system is being used, it is quite likely that the various user controls are still set to the factory defaults. However, it is a good idea to make certain they are. There are two ways to do this. 1. -
Page 35: Dacs4 Operation
DACS4 OPERATION DACS4 Operation: User Notes: We have made every effort to develop a software package that requires a minimum of acoustic measurement experience and is user friendly. For best results, you should possess a basic knowledge of the Windows ™... -
Page 36: Initial Dacs4 Screen
DACS4 OPERATION • Initial DACS4 Screen Figure 11: DACS4 Opening Screen This is the first and last screen displayed by the DACS4 System. You have three possible courses of action. 1. Run DACS2. This is the previous release of DACS, which is still suitable for calibrating any Synthesis System that uses analog equalizers and crossovers. -
Page 37: Enter Customer Information
DACS4 OPERATION • Enter Customer Information Figure 12: Customer Information Window The information you provide here performs two important functions. It attaches a customer and dealer name to the test data that is saved by DACS4. This data is later used to create the Synthesis Calibration Certificate. Please take care to enter the customer’s name exactly as he or she prefers. -
Page 38: Synthesis Model
DACS4 OPERATION • Synthesis Model Figure 13: Customer Information: Select a Synthesis Model Click on the [ ] button to expand the selection menu. Although there are only three Models of Synthesis, there are actually seven possible permutations currently available, each of which requires a different calibration strategy. •... -
Page 39: Center Screen Compensation
DACS4 OPERATION • Center Screen Compensation Figure 15: Identify Screen Type, Center Channel If the Center Channel speaker is behind a perforated screen or decorative cloth, you can add screen compensation to the SDEC. Select the appropriate screen: Cloth or None. If you are using a perforated screen or cloth not listed here, call your Synthesis Representative. -
Page 40: Confirm Dacs4 Connections
DACS4 OPERATION • Confirm DACS4 Connections Figure 17: DACS4 On-Screen Wiring Diagram Before DACS4 runs, this simple hookup diagram is provided for your review. Please take a moment to confirm that these connections are correct. Press [Any Key] when you are ready to continue. -
Page 41: Dacs4 Main Screen
DACS4 MAIN SCREEN DACS4 Main Screen: The following is an overview of the features and control facilities available on the main screen. Figure 18: DACS4 Main Calibration Screen This is the main Synthesis calibration workspace. Before you begin calibration, take a few minutes to familiarize yourself with the eight different communication fields represented on this screen. -
Page 42: Response Graph
DACS4 MAIN SCREEN Response Graph: Figure 19: Response Graph Window This area of the screen will display the results of each test, overlaid on the target curve. Amplitude, in dB, is indicated vertically (Y-axis) and frequency, Hz, is indicated horizontally (X-axis). The heavy vertical line at 100Hz is the cursor location. -
Page 43: Individual Filter Control
DACS4 MAIN SCREEN Figure 21: Filter Control Field The currently active filter’s parameters can be precisely adjusted here. Any desired center frequency can be entered in the frequency box. Mouse clicking on the bandwidth bar will toggle through all available filter bandwidths. Click the mouse pointer over the slider on the left and you can raise or lower the gain of the filter. -
Page 44: Overlay Previously Tested Channels
DACS4 MAIN SCREEN Overlay Previously Tested Channels: Figure 23: Channel Display Control Field When you perform a test on any channel, the corresponding text in this communication field turns solid black, indicating that it is available for display. To display a previously tested channel, click the mouse pointer on the box to the left of any avail- able channel. -
Page 45: Figure 26: Channel Gain And Delay Information
DACS4 MAIN SCREEN [F1] HELP This is a compilation of help topics, tips and tricks on nearly every aspect of DACS4 operation. [F2] AUTO–EQ Initiates automatic equalization of the active channel [F3] ACCEPT Press [F3] when you have completed all adjustments on the active channel. Pressing [F3] transmits the final settings to the SDEC, and puts a check mark in the channel status indicator. -
Page 46: Calibration Walk-Through
CALIBRATION WALK-THROUGH Calibration Walk-Through: If you have read everything up to now, and done everything suggested, you should be looking at this screen on the DACS4 computer. Figure 27: Fresh Install, First Screen Now would be a good time to begin reading the information presented in the online help field. It will guide you through the entire calibration process. -
Page 47: Auto-Time Correction
CALIBRATION WALK-THROUGH Auto-Time Correction: The first test you will perform, Auto-Time Correction, will briefly stimulate each speaker to determine the distance from microphone #1 to each speaker. Press [Ctrl]+[T] to run the test. Immediately after the test a dialog box, which reports the measurement results, will appear. -
Page 48: Cinema, Subwoofer Calibration
CALIBRATION WALK-THROUGH Cinema, Subwoofer Calibration: Figure 29: Ready for Sub-Woofer Level Test Before attempting equalization of any speaker, it is necessary to have the level preset so the unequalized response plot fits as well as possible over the target curve. This is necessary for two reasons. 1. -
Page 49: Setting The Level
CALIBRATION WALK-THROUGH • Setting The Level The first test you run on each channel is totally uncalibrated. The sound level could be several dB high or low and the response may be very irregular. This extreme irregularity can make it quite difficult to determine how much the level needs to be shifted. -
Page 50: Auto-Equalization
CALIBRATION WALK-THROUGH Figure 30 illustrates the results one might expect from using [Shift]+[F4] to set level. The fine upper trace is the first test, the lower trace is the second test with the subwoofer output lowered 5dB. Figure 31 illustrates the same test conducted using only [F4], which performs a standard resolution test. -
Page 51: Cinema, Left - Center - Right Calibration
CALIBRATION WALK-THROUGH Cinema, Left – Center – Right Calibration: The procedure in the steps above is substantially repeated for all subsequent channels. The topics that follow will focus on the differences. Steps that have already been explained will be listed only. •... -
Page 52: Run Auto-Eq
CALIBRATION WALK-THROUGH • Run Auto-EQ [F2]: Perform Auto-EQ. DACS4 performs Auto-EQ only below 800Hz. Beyond correctly setting the level, no attempt is made to equalize above 800Hz. You may observe significant response variations above 800Hz. As explained earlier in this manual, this is a normal consequence of speakers interacting with the room. -
Page 53: Setting The Level
CALIBRATION WALK-THROUGH • Setting The Level The default display mode for the ambient speakers includes a one-octave smoothing filter. Therefore, it is not necessary to use [Ctrl]+[F4] to set the level. [F4]: Set level. Repeat as needed. The target curve is significantly different. Because of the very different nature of the speakers, the range of equalization is 100Hz to 5kHz. -
Page 54: Quitting Dacs4
CALIBRATION WALK-THROUGH Quitting DACS4: • After a Complete Calibration When you have accepted the last channel, DACS4 will automatically transmit all settings to the SDEC and those settings will be burned to the nonvolatile FLASH memory. [F6]: Quits DACS4 Follow the instructions on the DACS4 screen to quit the program. Remove the “Loader” utility disk from the DACS4 computer and store it in a safe location at the installation site. -
Page 55: Troubleshooting
CALIBRATION WALK-THROUGH Troubleshooting: • Correcting Hum Problems Reading this will help you avoid hum problems in any Synthesis Home Theater System installation. It really isn’t very difficult to do, but you will need to take some preventive measures during system installation to prevent it. Why Does It Hum In The First Place? Anytime you interconnect two analog audio signal devices, and they each have their own AC cord, you can potentially generate some hum. -
Page 56: Video Devices
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. Securely attach one end of the ground strap to the SDP-2 using the center top cover retaining screw (found on the rear) as an attachment point. -
Page 57: Specifications
SPECIFICATIONS SPECIFICATIONS SDEC-1000 SDEC-2500 THD + Noise 0.02% @ 1kHz 0.02% @ 1kHz Frequency Response <15hz –20kHz +0 ,–1db <15hz –20kHz +0 ,–1db S/N Ratio ( A-weighted) 100db ref: max output 100db ref: max output Dynamic Range 114dB 114dB Input Level Range 15µV –...
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