Table of Contents
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Table of Contents
Related Manuals for JBL SYNTHESIS SDEC-2500
Summarization of Contents
1.0 PRECAUTIONS
1.1 Important Safeguards for Audio Products
Safety instructions for audio equipment, covering reading, retaining, and heeding warnings.
2.0 INTRODUCTION TO THE SDEC
2.0 Introduction
Overview of the SDEC-1000/2500 as a dealer-installed digital equalizer and time correction unit.
The Concept
Explains the JBL Synthesis solution and the SDEC's role in achieving advanced audio system performance.
2.1 SDEC-1000/SDEC-2500 Rear Panel
Illustrates the rear panel layout and connections for both SDEC models.
2.2 What the SDEC Does
Details the core functions of the SDEC, including Driver EQ, Time Correction, and Crossovers.
Driver EQ
Explains how the SDEC smooths speaker response and compensates for manufacturing tolerances.
Driver Time Correction
Describes how the SDEC corrects arrival times for better sound fidelity.
Channel to Channel Distance Correction (Auto-Time Correction)
Explains how the SDEC compensates for unequal speaker distances to optimize the listening spot.
Crossovers
Details the SDEC-1000's electronic crossover function for bi-amplified systems.
Screen Correction
Explains how the SDEC compensates for center channel speakers placed behind projection screens.
Modes
Discusses how the SDEC selects equalization curves for music and cinema based on speaker types.
Room Correction EQ
Highlights the importance of room acoustics and the SDEC's role in correcting them.
3.0 INSTALLING THE SDEC
3.1 Location, location, location
Guidance on selecting an appropriate installation location for the SDEC, considering power and heat.
3.2 A Note On Wiring
Discusses signal, speaker, AC power, and control line wiring for Synthesis systems.
3.3 Wiring Connections to the SDEC
Detailed steps for connecting the SDEC, covering analog equalizer replacement and new installations.
4.0 THE DIGITAL ACOUSTIC CALIBRATION SYSTEM
4.1 Operational Overview
General overview of the DACS4 system, its purpose, and the calibration process.
Stimulus
Describes the pink weighted pseudo-random noise used to stimulate speakers for testing.
Data Acquisition
Explains the process of gathering acoustic measurements using multiple microphones.
Data Post-Processing
Explains how data is processed, averaged, and converted for analysis using FFT.
Display Data
Describes how DACS4 displays test results, including response data and target curves.
Make Corrections
Details the process of making manual adjustments and using the automatic EQ algorithm.
Target Curves
Discusses the importance of target curves for optimal system response and setting levels.
Ideal Low-Frequency Response
Explains the desired low-frequency response characteristics for listening rooms, avoiding flatness.
Ideal High-Frequency Response
Discusses the requirements for timbral neutrality and flat on-axis response.
4.2 DACS4 CONNECTIONS AND USE
Instructions for connecting and setting up the DACS4 calibration system.
Things To Consider When Selecting A Location For DACS4
Guidance on choosing an optimal location for the DACS4 setup within the room.
Hookup
Instructions and diagram for connecting the DACS4 system to the Synthesis components.
AC/Power Connections
Details on connecting power supplies for the DACS4 hardware to the AC circuit.
Audio Connections
Information on connecting audio outputs from the EVP-1 to the surround processor.
Other Connections
Describes connections using DB25 and DB9 cables between computer, EVP-1, and SDEC.
Microphone Connection and Placement
Instructions on connecting microphones to the SMM-5 and placement guidelines.
Room Placement
Emphasizes optimal microphone placement for accurate measurements.
How is the Room Used?
Questions to ask the customer to determine optimal microphone placement strategy.
Microphone #1
Details on placing the first microphone for Auto-Time Correction.
Now Place the Remaining Microphones
Guidelines for placing the remaining microphones for optimal measurement.
4.3 Power Up Synthesis and DACS4
Step-by-step instructions for powering on the system components.
4.4 Preliminary Surround Processor Settings
Guidance on setting up the surround processor defaults before calibration.
4.5 DACS4 OPERATION
Explains how to use the DACS4 software for calibration.
User Notes
Notes on required experience and conventions for using the DACS4 software.
Notational Conventions
Explains the keyboard and symbol notations used in the manual and software.
About Online Help
Information on accessing and using the DACS4's built-in help system.
Starting DACS4
Instructions for booting the computer and initiating the DACS4 program.
Initial DACS4 Screen
Describes the opening screen of the DACS4 system and available options.
Enter Customer Information
Details on entering customer and system information for calibration.
Synthesis Model
How to select the specific Synthesis model for calibration.
Select a Surround Processor
Instructions for selecting the surround processor model within DACS4.
Center Screen Compensation
How to apply screen compensation for the center channel speaker.
Left/Right Screen Compensation
Instructions for applying screen compensation for left and right front speakers.
Confirm DACS4 Connections
Visual guide to verify all DACS4 system connections before running the software.
4.6 DACS4 MAIN SCREEN
Overview of the main calibration workspace, its features, and control facilities.
DACS4 Main Screen
Overview of the main calibration workspace, its features, and control facilities.
Response Graph
Explains the X-Y graph displaying test results against target curves.
Filters at a Glance
How to review filter settings including frequency, boost/cut, and bandwidth.
Individual Filter Control
Details on precisely adjusting active filter parameters like frequency, gain, and bandwidth.
Filter Control
Precise adjustment of active filter parameters including center frequency, gain, and bandwidth.
Channel and Mode Selection/Status
Indicates the status of each channel and the active operating mode (Music/Cinema).
Overlay Previously Tested Channels
How to display previously tested channels for comparison.
Online Help
Continuous display of topical information updated as you progress.
Special Function Keys
Lists and explains the function of the eight special function keys.
Channel Gain and Delay Information
Displays current gain settings and microphone-to-speaker distances for all channels.
4.7 CALIBRATION WALK-THROUGH
Step-by-step guide for performing the complete system calibration process.
Calibration Walk-Through
Introduces the step-by-step guide for the calibration process.
Fresh Install, First Screen
Describes the initial DACS4 screen and the requirement to press Spacebar.
Auto-Time Correction
Runs a test to determine speaker distances from microphone #1 and reports results.
Cinema, Subwoofer Calibration
Instructions for calibrating the subwoofer levels before equalization.
Setting The Level
Adjusting channel levels using smoothed display and standard tests.
Auto-Equalization
Initiates the automatic equalization routine for the active channel.
Cinema, Left – Center – Right Calibration
Details on setting levels for left, center, and right channels.
Run Auto-EQ
Performs automatic equalization for channels below 800Hz.
Setting The Level
Adjusting levels for ambient speakers using a one-octave smoothing filter.
Music Mode Calibration
Reconfigures DACS4 for Music mode calibration of subwoofers and front speakers.
Quitting DACS4
Procedures for exiting the DACS4 program after calibration or interruption.
SDEC Maintenance
Instructions for using the loader utility to maintain or replace the SDEC.
Troubleshooting
Guidance on identifying and correcting hum problems during installation.
Correcting Hum Problems
Steps to avoid hum issues in Synthesis Home Theater Systems.
Why Does It Hum In The First Place?
Explains the common causes of hum when interconnecting audio devices.
What You Can Do During Installation
Preventive measures during installation to reduce hum, focusing on grounding.
5.0 SPECIFICATIONS
SDEC-1000 Specifications
Lists technical specifications for the SDEC-1000 model.
SDEC-2500 Specifications
Lists technical specifications for the SDEC-2500 model.
6.0 INTERCONNECTION DIAGRAMS
SYNTHESIS ONE Interconnection Diagram
Shows the interconnection of components for a Synthesis One system.
SYNTHESIS TWO/THREE Interconnection Diagram
Illustrates the interconnection of components for Synthesis Two/Three systems.
7.0 CONTROL WIRING DIAGRAMS
SYNTHESIS ONE Control Wiring Diagram
Details the control wiring for a Synthesis One system, including signal pinouts.
SYNTHESIS TWO/THREE Control Wiring Diagram
Shows the control wiring for Synthesis Two/Three systems with signal pinouts.
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