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60TH ANNIVERSARY EDITION
560GTi/660GTi
COMPETITION SPEAKER SYSTEMS
OWNER’S GUIDE
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® FOR MORE THAN 60 YEARS, JBL HAS DELIVERED PRODUCTS THAT EXEMPLIFY THE TECHNOLOGY AND EXPERTISE GAINED THROUGH A LEADERSHIP ROLE IN PROFESSIONAL SOUND REPRODUCTION. THE JBL NAME HAS BEEN SYNONYMOUS WITH THE PRECISE, NATURALLY ARTICULATED SOUND FOUND IN MANY OF THE WORLD’S MOST PRESTIGIOUS LOCATIONS, INCLUDING CLUBS, CINEMAS AND RECORDING STUDIOS, AND LIVE-MUSIC REINFORCEMENT IN VENUES RANGING FROM CONCERT HALLS TO OUTDOOR STADIUMS. JBL LOUDSPEAKERS ARE FOR THOSE WHO WON’T COMPROMISE – IN THE
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TABLE OF CONTENTS INTRODUCTION ................................................2 SCIENCE OF JBL SPEAKER DESIGN ................4 PRODUCT FEATURES........................................6 SYSTEM DESIGN ............................................10 SPECIFICATIONS ............................................11 3 ENGLISH
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AT JBL, SPEAKER DESIGN IS ALL SCIENCE. THERE ARE THREE STAGES IN ENGINEERING LOUDSPEAKERS AT 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, along with a complete set of performance targets. Performance targets include maximum SPL, or how loud the speake
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TESTING At JBL, we spare no expense in testing loudspeakers. Prototype and production samples are first tested for frequency-response range and uniformity in one of our anechoic chambers using MLS and swept sine-wave analyzers. Sine-wave analysis measures harmonic distortion, which is a critical element in determining the sonic accuracy of the speaker. MLS, or maximum length sequence, analysis compares the noise output from the analyzer to the output of the speaker to determine the speaker’s im
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GTi COMPETITION SPEAKER SYSTEM TECHNOLOGY: LOW-DISTORTION WOOFER Distortion – sound produced erroneously – is the enemy of great speaker performance. At its worst, distortion makes speakers sound broken. At more moderate levels, distortion clouds the midrange, making vocals sound muddy and obscuring the music’s detail. At JBL, we’ve had more practice than any other speaker company at eliminating distortion, and it shows. GTi competition speaker systems include the lowest-distortion woofers w
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TWEETERS, WAVEGUIDES AND OPTIMAL 0° FREQUENCY RESPONSE 0 30° The dispersion pattern of the sound produced by a speaker is different at low –10 frequencies than at high frequencies. At frequencies with wavelengths greater 60° than the circumference of the speaker’s cone – the speaker’s piston range – the –20 sound is radiated in all directions. At higher frequencies, the dispersion pattern narrows. At frequencies for which the circumference of the speaker is about five –30 times the sound’s wave
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THE DIRECTIVITY INDEX (DI): HOW WE MEASURE THE RELATIONSHIP 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 along the horizontal and vertical axes of the speaker (Figure 7). With those measurements, we determine the size of the optimal listening window and
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Wire-Wound Polypropylene Precision Resistors Air Core Coils Caps With Integral Heatsink 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 the frequency response plot in Figure 9. Tweeter Without Waveguide Directivity Index Tweeter With Waveguide
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SYSTEM DESIGN USING THE GTi COMPETITION SPEAKER SYSTEMS. 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 placement even for a single listener. In many cases, on-axis placement for two listeners simply isn’t possib
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WOOFER MOUNTING CONSIDERATIONS • All woofers require a rigid baffle and isolation between the front and back of the speaker for best low-frequency extension. • The 660GTi woofer may be used in an infinite baffle or in a small sealed enclosure 3 with a volume equal to or larger than 1/8 ft. The 560GTi woofer may be used in an infinite baffle or in a small sealed enclosure with a volume equal to or larger 3 than 1/12 ft. • The GTi competition speaker systems include a choice of grille trim.
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ENGLISH
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176mm 6-15/16" 152mm 6" 560GTi 660GTi 69mm 2-11/16" 41mm 1-5/16" 55mm 102mm 2-3/16" 4" 69mm 116.7mm 138mm 2-11/16" 4-9/32" 5-7/16" 160mm 6-5/16" 69mm 2-11/16" 81.8mm 32mm 25mm 3-7/32" 1-1/4" 1" 116mm 128.1mm 51mm 4-9/16" 5-1/16" 2" 312mm 12-1/4" 153mm 32mm 6" 12mm 1-1/4" 121mm 15/32" 27mm 4-3/4" 1-1/16" 300mm 11-13/16" 52mm 2-1/16" 14 200mm 7-7/8" 59mm 16mm 2-5/16" 5/8" 114mm 4-1/2" 78mm 3-1/16" 8.7mm 11/32" 77.8mm 3-1/16" 102mm 4"
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560GTi 660GTi 2x 2x 2x 1x 2x 2x 2x 2x 1x 1x 1x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 12x 8x 8x 8x 4x 8x 12x 8x 8x 8x 4x 8x 16x 16x 2x 2x 2x 2x 15
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1 2 1 4" (102mm) 1 3 3 2 2 1 1 2 2 2 1 1 2 16
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560GTi 17
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660GTi 18
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THIELE/SMALL 560GTi 660GTi BL (T ) 7.6 7.56 M DCR (ohms) 3.07 3.48 M (g) 14.84 17.94 MS S (sq cm) 86.6 132.7 D C (µm/N) 312 382 MS V (l) 3.29 9.45 AS F (Hz) 74 60.8 S Q 0.37 0.42 ES Q 5.49 10.17 MS Q 0.34 0.4 T 1wSPL (dB0) 87.5 89 SPL 2.83V 91.7 92.6 H (mm) 15.74 17.27 VC H (mm) 6 6 AG X 4.87 5.36 MAX 3 3 V 196,000mm 288,890mm B L (mHz) 0.1 0.13 EVC 19
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THE OFFICIAL BRAND OF LIVE MUSIC. Harman Consumer Group, Inc. 250 Crossways Park Drive, Woodbury, NY 11797 USA 2, route de Tours, 72500, Château du Loir, France 516.496.3400 (USA only) www.jbl.com ©2007 Harman International Industries, Incorporated. All rights reserved. Part No. 560/660GTiOM Printed 3/07 JBL is a trademark of Harman International Industries, Incorporated, registered in the United States and/or other countries. Vented Gap Cooling is a trademark of Harman International Industri
