Instruction d'utilisation JBL M9500

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Version 9/14/95 7/27/98 2:58 PM Page 1
M9500 MONITOR LOUDSPEAKERS
OWNERS MANUAL
M9500

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Version 9/14/95 7/27/98 2:58 PM Page 2 GENERAL SYSTEM DESCRIPTION The JBL M9500 monitor loudspeaker system represents a refinement of the principles that have guided JBL’s high-level monitor system design over the last thirty years. In keeping with contemporary monitoring practice, the system is essentially of two-way design. A horn-compression driver section covers the frequency range from 650Hz to20kHz. Located above and below the high-frequency section are mirror-imaged low-frequency transd

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Version 9/14/95 7/27/98 2:58 PM Page 3 System Setup The M9500 systems are modular, each consisting of a stack of three separate enclosures. The larger of the bass enclosures are placed at the bottom, and the high-frequency/horn modules stack on top and are aligned by the screws that protrude on the bass section. The smaller bass modules are placed on top of the high-frequency modules and are similarly aligned. We recommend that you do not assemble the M9500 systems until you have determined th

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Version 9/14/95 7/27/98 2:58 PM Page 4 R D Option D, biamplification. This mode of operation requires a LF1 B Biamp HF + dedicated electronic dividing network crossing over at 650 Hz. 0 – R Norm LF2 We recommend the JBL DX-1 with internal compensation B R Input HF made for the M9500 system. If this mode is used, make sure B that the screwdriver adjustment on the back of each network R LF1 is set in the “biamp” position. B HF out Electronic dividing R Input network High-frequency trim switches o

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Version 9/14/95 7/27/98 2:58 PM Page 5 The JBL model 475Nd compression driver used in the M9500 has a smooth titanium dome 101 millimeters in diameter that has been lightly coated with Aquaplas™ damping compound. Its aluminum ribbon voice coil operates in a magnetic flux field of 1.65 tesla (16,500 gauss). Mid-band efficiency is 20%, while at the peak value of driver impedance it is in excess of 50%. The driver uses JBL’s Coherent Wave™ phasing plug, which provides equalized path lengths from all

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Version 9/14/95 7/27/98 2:58 PM Page 6 The directivity index (DI) of the H9500 horn is shown in Figure 5. The smoothly rising DI is a consequence of the gradual narrowing of the vertical dispersion angle above 2 kHz and contributes to the overall flatness of the high-frequency response of the system. 20 100 Figure 5. Plot directivity index (DI) and directivity 10 10 factor (Q) of the H9500. 0 1 20 50 100 200 500 1000 2000 5000 10000 20000 Frequency (Hz) Overall system on-axis pressure respon

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Version 9/14/95 7/27/98 2:58 PM Page 7 Care and Maintenance of the System Your M9500 monitors should give years of trouble-free service. Normally, the only routine maintenance will be cleaning. The grilles may be cleaned of dust gently with a vacuum cleaner using a brush attachment. If there should be stains on the grille, a soft bristle brush moistened with a dilute mixture of water and dishwashing detergent may be used. The same mixture may be used for cleaning the enclosure finish itself

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Version 9/14/95 7/27/98 2:58 PM Page 8 JBL continually strives to improve its products. New materials, produc- tion methods and design refinements are introduced into existing models without notice as a routine expression of our design philosophy. For this reason, JBL M9500 Series Loudspeakers may differ in some respect from their published specifications and descriptions, but will always equal or exceed the original specifications unless otherwise stated. JBL Consumer Products, Inc. 80 Cros