Meyer Sound MJF-212ATM - Manuals

v CONTENTS INTRODUCTION 1 CHAPTER 1: Introducing the mJf-212A High-Power Stage monitor 3 Advanced MJF-212A Driver Technology 3 Integrated Amplifier and Processing 4 Total System Approach 4 CHAPTER 2: Power Requirements 5 AC Power Distribution 5 Looping and Cabling 5 Power Connector Wiring Convention...

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 provides a general description of MJF-212A and its capabilities and functionality. Chapter 2: P...

3 CHAPTER1 The Meyer Sound MJF-212A is a self-powered stage monitor designed to meet critical monitoring requirements in professional applications. Exhibiting flat amplitude and phase responses and exceptional impulse response, the MJF-212A meets and exceeds the capabilities of conventional stage mo...

4 CHAPTER1 INTEGRATED 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 circuitry is housed within the cabinet, dramatically simp...

5 CHAPTER2 The MJF-212A monitor combines advanced self-powered loudspeaker technology with equally advanced power capabilities. Understanding the power distribution, voltage, and current requirements, as well as electrical safety issues, is critical to the safe and correct operation and deployment o...

6 CHAPTER2 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 Table 2.1. Table 2.1: Maximum looping capabilities for MJF-212A Circuit Breaker/Connector Ratin...

7 CHAPTER2 TIP: Since the MJF-212A does not require a dedicated neutral, it can tolerate elevated voltages from ground and can be connected between line-line terminals in a 120 V 3-phase Wye system. This results in 208 V AC between lines (nominal) and will therefore draw less current for the same ou...

8 CHAPTER2 NOTE: For best performance, the AC cable voltage drop should not exceed 10 volts, or 10 percent at 115 volts and 5 percent at 230 volts. Make sure that even with the AC voltage drop, the AC voltage always stays in the operating windows. The minimum electrical service amperage required by ...

9 CHAPTER3 More than just a self-powered stage monitor, the MJF-212A uses sophisticated amplification and protection circuitry and an advanced limiting system to produce consistent and predictable results in any system design. This chapter will help you understand and harness the power of the MJF-21...

10 CHAPTER3 CAUTION: Please note that the amplifier for the MJF-212A monitor is different from those found in other Meyer Sound loudspeakers. Specific functions for each model, such as crossover points, frequency and phase correction, and driver protection are determined by the control cards install...

11 CHAPTER3 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 remains on for longer than three seconds, that channel enters hard limiting ,...

13 CHAPTER4 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...

14 CHAPTER4 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 loud...

15 APPENDIXA The MJF-212A monitor requires a grounded outlet. It is very important that the system be properly grounded 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 th...

17 APPENDIXB ACOUSTICAlNote: Recommended maximum operating frequency range. Response depends on loading conditions and room acoustics.Operating frequency range 55 Hz – 18 kHz Note: Recommended maximum operating frequency range. Response depends on loading conditions and room acoustics. Frequency res...

19 APPENDIXB 27.07 [688mm] 16.11 [409mm] 8.80 [223mm] 40¡ 13.70 [348mm] 23.00 [584mm] 40¡ PHySICAl Enclosure Premium birch 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) Wei...