Product Description
The Meyer Sound MJF-212A is a selfpowered stage monitor loudspeaker designed to meet critical requirements in professional applications. Exhibiting flat amplitude and phase responses, fullrange bandwidth, and exceptional impulse response, the MJF-212A far exceeds the capabilities of conventional stage monitors while offering the simplicity of setup and operation provided by self-powered systems.
MJF-212A specifications
Acoustical
Operating Frequency Range: 55 Hz – 18 kHz
Frequency Response: 60 Hz – 16 kHz ±4 dB
Phase Response: 500 Hz – 16 kHz ±45°
Maximum Peak SPL: 139 dB
Dynamic Range: >110 dB
Coverage
50° symmetrical
Crossover
1600 Hz
Transducers
Low Frequency: Two high-power 12″ cone drivers with neodymium magnets
Nominal impedance: 2 Ω Voice coil size: 4″
Power handling capability: 1200 W (AES)5
High Frequency: 4″ compression driver
Nominal impedance: 8 Ω Voice coil size: 4″
Diaphragm size: 4″
Exit size: 1.5″
Power handling capability: 250 W (AES)
Audio Input
Type: Differential, electronically balanced
Maximum 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 kΩ differential between pins 2 and 3
Wiring: Pin 1: Chassis/earth through 220 kΩ, 1000 pF, 15 V clamp network to
provide virtual ground lift at audio frequencies
Pin 2: Signal +
Pin 3: Signal –
Case: Earth ground and chassis
DC Blocking: Differential DC blocking up to max common mode voltage
CMRR: >50 dB, typically 80 dB (50 Hz–500 Hz)
RF Filter: Common mode: 425 kHz; Differential mode: 142 kHz
TIM Filter: Integral to signal processing (<80 kHz)
Nominal Input Sensitivity:0 dBV (1 V rms, 1.4 V pk) continuous is typically the onset of limiting
for noise and music
Input Level: Audio source must be capable of producing +20 dBV (10 V rms,
14 V pk) into 600 Ω in order to produce maximum peak SPL over the
operating bandwidth of the loudspeaker
Amplifier
Type: Three-channel complementary MOSFET output stages (class AB/H)
Output Power: 1275 W (three channels; 2 x 500 W, 1 x 275 W)
Total Output: 2550 W peak
THD, IM, TIM: <.02%
Load Capacity: 2 Ω low channels; 8 Ω high channel
Cooling: Convection
AC Power
Connecto: PowerCon with looping output or VEAM
Voltage Selection: Automatic, two ranges, each with high-low voltage tap
(uninterrupted)
Safety Agency Rated Operating Range: 95 V AC – 125 V AC; 208 V AC – 235 V AC, 50/60 Hz
Turn-on and Turn-off Points: 85 V AC – 134 V AC; 165 V AC – 264 V AC
Current Draw: Idle Current: 0.650 A rms (115 V AC); 0.310 A rms (230 V AC); 0.760 A rms (100 V AC)
Max Long-Term Continuous Current (>10 sec): 4.67 A rms (115 V AC); 2.37 A rms (230 V AC); 5.25 A rms (100 V AC)
Burst Current (<1 sec): 7.90 A rms (115 V AC); 4.10 A rms (230 V AC); 9.24 A rms (100 V AC)
Ultimate Short-Term Peak Current Draw: 20 A pk (115 V AC); 10 A pk (230 V AC); 21.8 A pk (100 V AC)
Inrush Current: 10 A pk (115 and 100 V AC); 18 A pk (230 V AC)
RMS Network (optional)
Equipped with two-conductor twisted-pair network, reporting all
operating parameters of amplifiers to system operator’s
host computer
