Meyer Sound MJF-212ATM manuale d’uso

OPERA TING INSTRUCTIONS UL TRAseRies MJF-212A ™ High-Power Stage Monitor Keep these important operating instructions. Check www .meyersound.com for updates.[...]

ii DECLARA TION OF CONFORMITY ACCORDING TO ISO/IEC GUIDE 22 AND EN 45014 Manufacturer’ s Name: Meyer Sound Laboratories Inc. Manufacturer’ s Address: 2832 San Pablo Avenue Berkeley , CA 94702-2204, USA declares that the pr oduct Product Name: MJF-212A loudspeaker Product Options: All conforms to the following Product Specifications Safety: EN6[...]

ii i SYMBOLS USED These symbols indicate important safety or operating features in this booklet and on the chassis: 1. Read these instructions. 2. Keep these instructions. 3. Heed all warnings. 4. Follow all instructions. 5. Do not use this loudspeaker near water . 6. Clean only with dry cloth. 7. Do not block any ventilation openings. Install in a[...]

iv English - T o reduce the risk of electric shock, disconnect the loudspeaker from the AC mains befor e installing audio cable. Reconnect the power cord only after making all signal connections. - Connect the loudspeaker to a two-pole, three-wir e grounding mains receptacle. The r eceptacle must be connected to a fuse or circuit br eaker . Connect[...]

v CONTENTS INTRODUCTION 1 CHAPTER 1: Introducing the MJF-212A High-Power Stage Monitor 3 Advanced MJF-212A Driver T echnology 3 Integrated Amplifier and Processing 4 T otal System Approach 4 CHAPTER 2: Power Requirements 5 AC Power Distribution 5 Looping and Cabling 5 Power Connector Wiring Conventions 6 V oltage Requirements 6 Current Requir emen[...]

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1 INTRODUCTION These operating instructions provide important information about the form, features, function, and specifications of the MJF-212A ™ high-power stage monitor . Chapter 1: Introducing MJF-212A pr ovides a general description of MJF-212A and its capabilities and functionality . Chapter 2: Power Requirements discusses power distributi[...]

2 INTRODUCTION[...]

3 CHAPTER 1 The Meyer Sound MJF-212A is a self-powered stage monitor designed to meet critical monitoring requir ements in professional applications. Exhibiting flat amplitude and phase responses and exceptional impulse r esponse, the MJF-212A meets and exceeds the capabilities of conventional stage monitors while offering the simplicity of setup [...]

4 CHAPTER 1 INTEGRA TED AMPLIFIER AND PROCESSING As a self-powered loudspeaker , the MJF-212A incorporates a high-power , three-channel, class AB/H power amplifier using complementary power MOSFET output stages. In addition, sophisticated control cir cuitry is housed within the cabinet, dramatically simplifying setup and installation. T o use the [...]

5 CHAPTER 2 The MJF-212A monitor combines advanced self-powered loudspeaker technology with equally advanced power capabilities. Understanding the power distribution, voltage, and current r equirements, as well as electrical safety issues, is critical to the safe and correct operation and deployment of the MJF-212A monitor . The MJF-212A uses a Pow[...]

6 CHAPTER 2 The blue input connector serves as the input for all the units looped in that circuit and is rated at 20 amps maximum. Please make sure never to exceed 20 amps on any single connector . Refer to T able 2.1. T able 2.1: Maximum looping capabilities for MJF-212A Circuit Br eaker/ Connector Rating 115 V AC 230 V AC 100 V AC 15 amps 2 Loope[...]

7 CHAPTER 2 TIP : S inc e t he MJF -21 2A doe s n ot re qui r e a d edi cat ed neu tra l, it can to ler ate ele vat ed vol tag es fr om gr ou nd and ca n b e c onn ect ed bet wee n lin e-l ine te rmi nal s i n a 12 0 V 3- pha se W ye sys tem . Thi s r e sul ts in 208 V A C b etw een li nes (n omi nal ) a nd wil l t her e for e dra w l ess cu rr en [...]

8 CHAPTER 2 NOTE: For best performance, the AC cable voltage drop should not exceed 10 volts, or 10 percent at 115 volts and 5 per cent at 230 volts. Make sure that even with the AC voltage dr op, the AC voltage always stays in the operating windows. The minimum electrical service amperage requir ed by an MJF-212A system is the sum of each loudspea[...]

9 CHAPTER 3 More than just a self-power ed stage monitor , the MJF-212A uses sophisticated amplification and protection cir cuitry and an advanced limiting system to produce consistent and predictable r esults in any system design. This chapter will help you understand and harness the power of the MJF-212A monitor’ s amplifier and audio systems[...]

10 CHAPTER 3 CAUTION: Please note that the amplifier for the MJF-212A monitor is differ ent from those found in other Meyer Sound loudspeakers. Specific functions for each model, such as crossover points, frequency and phase corr ection, and driver protection ar e determined by the control car ds installed inside the amplifier . Do not exchange [...]

11 CHAPTER 3 The MJF-212A is performing within its acoustical specifications and operating at a normal temperature if the limit LEDs are lit for no longer than two seconds, and then go off for at least one second. If an LED r emains on for longer than three seconds, that channel enters har d limiting , with the following negative consequences: [...]

12 CHAPTER 3[...]

13 CHAPTER 4 RMS is a real-time monitoring system that connects Meyer Sound self-powered loudspeakers with a Windows-based PC at the sound mix position or other location. Optional RMS software delivers extensive status and system performance data from every installed loudspeaker . The MJF-212A monitor is RMS-ready and can be upgraded by installing [...]

14 CHAPTER 4 NOTE: The Service LED indicates that the stage monitor is not commissioned on the network and has no effect on the acoustical and/or electrical activity of the MJF-212A. The monitor must be commissioned on a network using the RMS software for the service LED to stop blinking. When a loudspeaker has been installed on the network, the Se[...]

15 APPENDIX A The MJF-212A monitor requir es a grounded outlet. It is very important that the system be properly gr ounded in order to operate safely and properly . Figure A.1 illustrates correct wiring for the creation of power cables and distribution systems for MJF-212A stage monitors shipped from the factory with the VEAM multipin connector . l[...]

16 APPENDIX A[...]

17 APPENDIX B ACOUSTICAL Note: Recommended maximum operating frequency range. Response depends on loading conditions and r oom acoustics. Operating frequency range 55 Hz – 18 kHz Note: Recommended maximum operating frequency range. Response depends on loading conditions and room acoustics. Frequency r esponse 60 Hz – 16 kHz ±4 dB Note: Half-sp[...]

18 APPENDIX B AUDIO INPUT T ype Differ ential, electronically balanced Max. common mode range ±15 V DC, clamped to earth for voltage transient protection Connectors Female XLR input with male XLR loop output or VEAM all-in-one connector (integrates AC, audio, and network) Input impedance 10 k Ω differ ential between pins 2 and 3 Wiring Pin 1: Cha[...]

19 APPENDIX B 27.07 [688mm] 16.11 [409mm] 8.80 [223mm] 40¡ 13.70 [348mm] 23.00 [584mm] 40¡ PHYSICAL Enclosure Premium bir ch plywood Finish Black textured Protective grille Powder -coated, hex-stamped steel, black mesh Dimensions 27.07" w x 16.11" h x 23.00" d (688 mm x 409 mm x 584 mm) W eight 108 lbs (49 kg)[...]

20 APPENDIX B[...]

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©2007 Meyer Sound Laboratories Inc. 05.157.005.02 A Meyer Sound Laboratories Inc. 2832 San Pablo Avenue Berkeley , CA 94702 www .meyersound.com T : +1 510 486.1166 F: +1 510 486.8356[...]