User manual JBL SYN3-ARRAY

[. . . ] All Rights Reserved Design and digital production by Harman Digital Systems Group Design and Production Center, Woodbury, New York JBL Consumer Products 250 Crossways Park Drive, Woodbury, NY 11797 8500 Balboa Boulevard, Northridge, CA 91329 800-336-4JBL Printed on Recycled Paper Part Number: 1113-SDECInstal 5 TABLE OF Figures Figure 1: Figure 2: Figure 3: Figure 4: Figure 5: Figure 6: Figure 7: Figure 8: Figure 9: Figure 10: Figure 11: Figure 12: Figure 13: Figure 14: Figure 15: Figure 16: Figure 17: Figure 18: Figure 19: Figure 20: Figure 21: Figure 22: Figure 23: Figure 24: Figure 25: Figure 26: Figure 27: Figure 28: Figure 29: Figure 30: Figure 31: Figure 32: Figure 33: Figure 34: Figure 35: Raw Driver Response/Corrected Driver Response _________________________________________13 System With & Without Driver Time Correction___________________________________________14 Effect of Auto-Time Correction ________________________________________________________15 Effect of Screen Correction EQ ________________________________________________________16 Effect of Room EQ _________________________________________________________________17 System Response In 5 Locations ______________________________________________________26 Synthesis 1 Main Target Curve, Below 1kHz______________________________________________28 Complete Synthesis 1 Target Curve ____________________________________________________29 DACS4 Connection to Synthesis_______________________________________________________31 Microphone Placement: Large Listening Area ____________________________________________33 DACS4 Opening Screen _____________________________________________________________37 Customer Information Window _______________________________________________________38 Customer Information Window: Select A Synthesis Model___________________________________39 Select A Surround Processor _________________________________________________________39 Identify Screen Type, Center Channel ___________________________________________________40 Identify Screen Type, Left & Right Front_________________________________________________40 DACS4 On Screen Wiring Diagram_____________________________________________________41 DACS4 Main Calibration Screen _______________________________________________________42 Response Graph Window____________________________________________________________43 Filter Setting and Control Field ________________________________________________________43 Filter Control Field _________________________________________________________________44 Direct Channel and Mode Access ______________________________________________________44 Channel Display Control Field_________________________________________________________45 Continuously Updated Online Help_____________________________________________________45 Function Keys and Status Line ________________________________________________________45 Channel Gain and Delay Information ___________________________________________________46 Fresh Install, First Screen____________________________________________________________47 Auto-Time Correction Dialog Box ______________________________________________________48 Ready For Subwoofer Level Test ______________________________________________________49 Setting Level______________________________________________________________________50 Without Smoothing Filter ____________________________________________________________50 Results of Auto-EQ_________________________________________________________________51 Left Cinema Level Set_______________________________________________________________52 Auto-EQ _________________________________________________________________________53 Ambient Target ____________________________________________________________________54 6 1. 1 IMPORTANT SAFEGUARDS PRECAUTIONS 1. 0 1. 1 Important Safeguards For Audio Products PLEASE READ CAREFULLY ALL THE FOLLOWING IMPORTANT SAFEGUARDS THAT ARE APPLICABLE TO YOUR EQUIPMENT 1. Read Instructions ­ All the safety and operating instructions should be read before the product is operated. Retain Instructions ­ The safety and operating instructions should be retained for future reference. Heed Warnings ­ All warnings on the product and in the operating instructions should be adhered to. [. . . ] After each channel is analyzed, corrective settings are transmitted to the SDEC. These settings are stored in non-volatile memory, thus assuring that the settings are permanent. There are no controls on the SDEC that can disturb the memorized settings. Operational Overview: Proper calibration of an audio playback system is a very complex undertaking. The first requirement is to acquire test data that accurately portrays what is actually happening in the room. Second, we must post-process this data to create a view that is relevant to what we actually hear. Last, corrective action must be taken to make the actual listening environment more closely match the ideal. Properly administering this process is usually a good day's work even for an experienced acoustics engineer using sophisticated analysis devices. Using DACS4, you will be able to perform this work in a few hours time. Stimulus: DACS4 uses pink weighted pseudo-random noise to stimulate the speakers for each test. This stimulus is used because it contains equal energy per octave, and all frequencies from 16Hz to 20kHz are represented. The stimulus level is preset to generate a sound level of 85dBC when the system is properly calibrated. To this end, DACS4 incorporates a very sophisticated automatic EQ algorithm. This routine determines the time arrival variance from channel to channel and programs the SDEC to add delay as needed to normalize all channels to the same arrival time. At the conclusion of the calibration session, all settings are transmitted to the FLASH EPROM in the SDEC and made permanent (burned). · Target Curves: Intuitive logic would tend to indicate that the best sound would be achieved when the system delivers flat frequency response. While this is true for all other components in the audio chain, this is definitely not true in the case of loudspeakers installed in listening rooms. There are several reasons for this, and it has taken many years of research to establish just what the most desirable performance characteristics are. · Ideal Low-Frequency Response Room boundaries (walls, ceiling and floor) tend to contain low-frequency energy within the room. The exact frequency at which this effect begins and the amount of boost realized are a function of the room size, shape and wall construction. This same low-frequency enhancement also occurs in recording studios, and the recording engineers know this will occur during playback. Therefore, it would be wrong to "flatten" the speaker system response in the playback environment. By surveying many listening rooms over the years, JBL engineers have established a low-frequency response characteristic that delivers the most consistently satisfactory results. [. . . ] You do not need to correct the house wiring to get the desired results. It may be necessary to tie all of the hardware together electrically so there is no ground potential difference between the various devices and third wire ground from the AC outlet(s). This is why you must create the lowest possible impedance ground path between all of the equipment. One very effective way of accomplishing this is by mounting the devices into a metal equipment rack. [. . . ]