60TH ANNIVERSARY EDITION 560GTi/660GTi COMPETITION SPEAKER SYSTEMS OWNER’S GUIDE
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.
ENGLISH TABLE OF CONTENTS INTRODUCTION ................................................2 SCIENCE OF JBL SPEAKER DESIGN ................4 PRODUCT FEATURES........................................6 SYSTEM DESIGN ............................................10 SPECIFICATIONS ............................................
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. Real-Time FFT Laser Vibrometry: This breakthrough technology uses scanning infrared-laser impulses that are reflected off a speaker’s diaphragm and analyzed by a computer.
Once the design is perfected, power handling is verified for production-grade samples by subjecting them to filtered octaves of pink noise at rated power for 100 hours. That’s right, 100 hours. Finally, samples are tested for longevity in our environmental test lab, according to the rigorous standards set by the automotive industry. The last phase in our extensive testing involves the most critical instruments in our possession – our ears. We listen…and listen…and listen.
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 we’ve ever built.
110 30° –10 60° –20 –30 90° 270° Figure 2. Woofer dispersion pattern in the crossover region. 0° 0 30° –10 60° –20 270° 90° Figure 3. Tweeter dispersion pattern in the crossover region. On Axis Off Axis dBSPL 0° 0 ENGLISH TWEETERS, WAVEGUIDES AND OPTIMAL FREQUENCY RESPONSE The dispersion pattern of the sound produced by a speaker is different at low frequencies than at high frequencies.
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).
Polypropylene Caps Air Core Coils Wire-Wound Precision Resistors With Integral Heatsink the tweeter’s output at low frequencies in the listening window and decreases its output 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.
SYSTEM DESIGN USING THE GTi COMPETITION SPEAKER SYSTEMS. Figure 15. Woofer and tweeter mounted in the kick panel and aimed at a point between the driver and passenger. Coverage provided by separate listening windows. 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.
TWEETER MOUNTING CONSIDERATIONS • Use the waveguides, if possible. • The waveguide requires a hole 4" in diameter for mounting. • Aim the tweeters at a point in between the two front-seat positions, if the waveguides will be mounted in the A-pillars or kick panels. ENGLISH WOOFER MOUNTING CONSIDERATIONS • All woofers require a rigid baffle and isolation between the front and back of the speaker for best low-frequency extension.
ENGLISH
660GTi 560GTi m 6m 6" 17 15/1 6- m 2m " 6 15 69mm 2-11/16" 41mm 1-5/16" 102mm 4" 138mm 5-7/16" 55mm 2-3/16" 69mm 2-11/16" 116.7mm 4-9/32" 59mm 2-5/16" 77.8mm 3-1/16" 16mm 5/8" 8.7mm 11/32" 160mm 6-5/16" 69mm 2-11/16" 81.8mm 3-7/32" 116mm 4-9/16" 32mm 1-1/4" 128.
660GTi 560GTi 2x 2x 2x 2x 2x 1x 2x 2x 1x 1x 1x 2x 2x 2x 2x 2x 12x 8x 8x 2x 2x 2x 8x 4x 8x 16x 2x 2x 2x 2x 12x 2x 2x 8x 8x 8x 4x 8x 16x 15
1 2 1 4" (102mm) 1 3 3 2 2 1 1 2 2 2 1 1 2 16
560GTi 17
660GTi 18
THIELE/SMALL 560GTi 660GTi BL (TM) 7.6 7.56 DCR (ohms) 3.07 3.48 MMS (g) 14.84 17.94 SD (sq cm) 86.6 132.7 CMS (µm/N) 312 382 VAS (l) 3.29 9.45 FS (Hz) 74 60.8 QES 0.37 0.42 QMS 5.49 10.17 QT 0.34 0.4 1wSPL (dB0) 87.5 89 SPL 2.83V 91.7 92.6 HVC (mm) 15.74 17.27 HAG (mm) 6 6 XMAX VB LEVC (mHz) 4.87 5.36 196,000mm 288,890mm3 0.1 0.
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.
