Page 2 - Office of Quality Manager
ii DEClARATION Of CONfORmITy ACCORDING TO ISO/IEC GUIDE 22 AND EN 45014 manufacturer’s Name: Meyer Sound Laboratories Inc. manufacturer’s Address: 2832 San Pablo AvenueBerkeley, CA 94702-2204, USA declares that the product Product Name: MJF-212A loudspeaker Product Options: All conforms to the follo...
Page 3 - SymbOlS USED
iii 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 ...
Page 4 - English; SAfETy SUmmARy
iv English - To reduce the risk of electric shock, disconnect the loudspeaker from the AC mains before installing audio cable. Reconnect the power cord only after making all signal connections. - Connect the loudspeaker to a two-pole, three-wire grounding mains receptacle. The receptacle must be con...
Page 5 - CONTENTS
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...
Page 7 - Power Requirements; HOw TO USE THIS mANUAl; NOTE; INTRODUCTION
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...
Page 9 - ADVANCED mJf-212A DRIVER TECHNOlOGy; CHAPTER 1: INTRODUCING THE mJf-212A HIGH-POwER STAGE mONITOR
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...
Page 10 - INTEGRATED AmPlIfIER AND PROCESSING; In order to use RMS, you will need; TOTAl SySTEm APPROACH
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...
Page 11 - AC POwER DISTRIbUTION; lOOPING AND CAblING; If you replace the AC power cable; CHAPTER 2: POwER REqUIREmENTS
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...
Page 12 - all; POwER CONNECTOR wIRING CONVENTIONS
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...
Page 13 - CURRENT REqUIREmENTS; maximum long-term continuous current
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...
Page 14 - ElECTRICAl SAfETy ISSUES; including
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 ...
Page 15 - AUDIO INPUT; AmPlIfICATION AND PROTECTION CIRCUITRy; CHAPTER 3: AmPlIfICATION AND AUDIO
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...
Page 16 - mJf-212A INTERCONNECTIONS
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...
Page 17 - hard; COOlING SySTEm
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 ,...
Page 19 - UNDERSTANDING THE RmS mODUlE; exclusively; CHAPTER 4: RmS REmOTE mONITORING SySTEm
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...
Page 20 - Service button
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...
Page 21 - APPENDIx A: OPTIONAl VEAm mUlTIPIN CONNECTOR
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...
Page 23 - TRANSDUCERS; APPENDIx b: mJf-212A SPECIfICATIONS AND DImENSIONAl DRAwINGS
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...
Page 25 - PHySICAl
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...
