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Table of contents for the manual
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Page 1
560GT i/660GT i COMPETITION SPEAKER SYSTEMS 60TH ANNIVERSARY EDITION OWNER’S GUIDE[...]
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FOR MORE THAN 60 YEARS , JBL ® HAS DELIVERED PRODUCTS THA T EXEMPLIFY THE TECHNOLOGY AND EXPERTISE GAINED THROUGH A LEADERSHIP ROLE IN PROFESSIONAL SOUND REPRODUCTION. THE JBL NAME HAS BEEN SYNONYMOUS WITH THE PRECISE, NA TURALL Y ARTICULA TED SOUND FOUND IN MANY OF THE WORLD’S MOST PRESTIGIOUS LOCA TIONS, INCLUDING CLUBS , CINEMAS AND RECORDING[...]
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T ABLE OF CONTENTS INTRODUCTION ................................................2 SCIENCE OF JBL SPEAKER DESIGN ................4 PRODUCT FEA TURES ........................................6 SYSTEM DESIGN ............................................10 SPECIFICA TIONS ............................................11 3 ENGLISH[...]
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THERE ARE THREE ST AGES IN ENGINEERING LOUDSPEAKERS A T JBL: Computer -aided design and modeling, prototyping and testing. JBL speakers are thoroughly tested and qualified at each stage to ensure that the finished product performs flawlessly . Every speaker design starts with physical dimensions that facilitate installation in factory locations, al[...]
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Anechoic Chambers: JBL ’ s anechoic chambers are expensive … but worth the investment. The baffles on the walls of the chamber absorb sound at all audible frequencies. In this setting, JBL engineers can assess critical details of the speaker’ s performance without the effects of extraneous noise or reflected sound. Environmental T est Lab: JB[...]
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GTi COMPETITION SPEAKER SY STEM TECHNOLOGY : 1. Spider-Landing V ents: Minimize distortion from mechanical noise. 2. Nomex ® Spider: Provides linear force in both movement directions. 3. Nitrile-Butylene Surround: Ensures superior longevity . 4. Copper Polepiece Cap: Provides linear inductance over the full range of forward voice-coil travel for r[...]
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TWEETERS, W A VEGUIDES AND OPTIMAL FREQUENCY RESPONSE The dispersion pattern of the sound produced by a speaker is different at low frequencies than at high frequencies. At frequencies with wavelengths greater than the circumference of the speaker’ s cone – the speaker’ s piston range – the sound is radiated in all directions. At higher fre[...]
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THE DIRECTIVITY INDEX (DI): HOW WE MEASURE THE RELA TIONSHIP BETWEEN ON-AXIS RESPONSE AND OFF-AXIS RESPONSE The Directivity Index (DI) is the ratio of the intensity of the sound in the listening window to the average of the intensity of the sound radiated at all angles (sound power). We make measurements of the speakers in two semicircular patterns[...]
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9 Figure 10. Figure 12. 1K 2K 5K 10K 20K the tweeter’ s output at low frequencies in the listening window and decreases its out- put in the off-axis response. That’ s a much closer match to the directivity of the woofer , which is focused into the listening window in the crossover region. The crossover region is also indicated in dark green in [...]
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Many speaker systems are designed for on-axis listening and often include a listening window that’ s ±30° from the speaker’ s 0° axis. That’ s great for home audio or other applications where speakers can be easily pointed at a single listener . In a car , however , the possible speaker mounting locations don’t always allow for on-axis p[...]
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11 Figure 20. Figure 19. W OOFER MOUNTING CONSIDERA TIONS • All woofers require a rigid baffle and isolation between the front and back of the speaker for best low-frequency extension. • The 660GT i woofer may be used in an infinite baffle or in a small sealed enclosure with a volume equal to or larger than 1/8 ft 3 . The 560GT i woofer may be [...]
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ENGLISH[...]
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14 69mm 2-11/16" 116mm 4-9/16" 59mm 2-5/16" 16mm 5/8" 102mm 4" 138mm 5-7/16" 152mm 6" 81.8mm 3-7/32" 128.1mm 5-1/16" 77.8mm 3-1/16" 8.7mm 11/32" 116.7mm 4-9/32" 160mm 6-5/16" 176mm 6-15/16" 300mm 11-13/16" 52mm 2-1/16" 12mm 15/32" 200mm 7-7/8" 312mm 12-1/4&quo[...]
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15 560GTi 660GTi 2x 2x 1x 2x 2x 2x 2x 2x 2x 2x 2x 12x 8x 8x 4x 8x 8x 1x 16x 2x 2x 2x 1x 2x 2x 2x 2x 2x 2x 2x 12x 8x 8x 4x 8x 8x 1x 16x 2x[...]
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16 1 2 3 1 2 4" (102mm) 1 2 3 1 2 1 2 1 2 1 2[...]
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17 560GTi[...]
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18 660GTi[...]
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THIELE/SMALL 560GT i 660GTi BL (T M ) 7.6 7.56 DCR (ohms) 3.07 3.48 M MS (g) 14.84 17.94 S D (sq cm) 86.6 132.7 C MS (µm/N) 312 382 V AS (l) 3.29 9.45 F S (Hz) 74 60.8 Q ES 0.37 0.42 Q MS 5.49 10.17 Q T 0.34 0.4 1wSPL (dB0) 87.5 89 SPL 2.83V 91.7 92.6 H VC (mm) 15.74 17.27 H AG (mm) 6 6 X MAX 4.87 5.36 V B 196,000mm 3 288,890mm 3 L EVC (mHz) 0.1 0[...]
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Harman Consumer Group, Inc. 250 Crossways Park Drive, Woodbury , NY 11797 USA 2, route de T ours, 72500, Château du Loir , France 516.496.3400 (USA only) www.jbl.com THE OFFICIAL BRAND OF LIVE MUSIC. ©2007 Harman International Industries, Incorporated. All rights reserved. Part No. 560/660GT iOM Printed 3/07 JBL is a trademark of Harman Internati[...]