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MJF-212A Monotor

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Location:
United States
Warranty:
Limited warranty
Sales Questions?:
Condition:
Used
Quantity:

MEYER SOUND MJF-212A MONITOR (pre-owned)

 

The Meyer Sound MJF-212A is a self-powered stage monitor loudspeaker designed to meet critical requirements in professional applications. Exhibiting flat amplitude and phase responses, full-range 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.

 

The Meyer Sound MJF-212A monitor's phase-corrected frequency range of 55 Hz to 18 kHz enables accurate reproduction of both vocals and instruments with high gain before feedback and provides excellent intelligibility at high output levels with low distortion and no coloration added to the signal. The face of the low-profile cabinet slopes at 40 degrees from the stage to permit optimal placement relative to the talent, while its medium-Q horn provides even coverage in both the horizontal and vertical planes.

 

The Meyer Sound MJF-212A's high-frequency section comprises a 4-inch diaphragm compression driver coupled to a symmetrical (50-degrees horizontal by 50-degrees vertical) constant-directivity horn. A pair of high-power 12-inch neodymium magnet cone drivers with 4-inch voice coils, mounted in an optimally vented enclosure, reproduces low frequencies.

 

Each of the drivers is powered by one channel of a three-channel class AB/H amplifier that employs complementary power MOSFET output stages to provide total burst output of 1275 watts (2 x 500 W, 1 x 275 W), 2550 watts peak. The MJF-212 incorporates Meyer Sound's Intelligent AC system for automatic voltage selection, EMI filtering, soft current turn-on and surge suppression. The rugged cabinet is constructed from birch plywood and coated with a durable, textured black finish.

 

FEATURES

§  Output power- 1275 W

§  Coverage pattern- 50 degrees symmetrical

§  High peak power ensures excellent transient response

§  Flat frequency and phase responses afford high levels of gain before feedback

§  Low profile preserves sightlines

§  Symmetrical, medium-Q pattern provides even coverage

 

LYON DATA

ACOUSTICAL

Operating Frequency Range

55 Hz – 18 kHz

Note: Recommended maximum operating frequency range. Response depends on loading conditions and room acoustics.

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

CROSSOVER

50° symmetrical

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)5

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 k Ω 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 the maximum 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

3-channel, complementary MOSFET output stages (class AB/H bridged)

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

Connector

PowerCon with looping output or VEAM

Safety Rated Voltage Range

95–125 V AC, 50–60 Hz

208–235 V AC, 50–60 Hz

Turn-on/off Points

Turn-on: 85 V AC; Turn-off: 134 V AC

Turn-on: 165 V AC; Turn-off: 264 V AC

Current Draw

Idle

0.650 A rms (208 V AC)

0.310 A rms (230 V AC)

0.760 A rms (100 V AC)

Maximum Long-Term Continuous

4.67 A rms (208 V AC)

2.37 A rms (230 V AC)

5.25 A rms (100 V AC)

Burst

7.90 A rms (208 V AC)

4.10 A rms (230 V AC)

9.24 A rms (100 V AC)

Ultimate Short-Term Peak Current Draw

20 A peak (208 V AC)

10 A peak (230 V AC)

21.8 A peak (100 V AC)

Inrush

10 A peak (115 and 100 V AC);)

18 A pk (230 V AC)

 

PHYSICAL

Enclosure

Multi-ply hardwood

Finish

Black textured

Protective Grille

Powder-coated hex-stamped steel, black mesh screen

Rigging

End-frames with captive Guide-A-Links (0.0 to 9.0-degree splay angles), quick-release pins, and detachable side handles

Dimensions

27.07 inches (688 mm) W

16.11 inches (409 mm) H

23.00 inches (584 mm) D

Weight

108 lbs (49 kg)

ENVIRONMENTAL

Operating Temperature

0° C to +45° C

Non-Operating Temperature

–40° C to +75° C

Humidity

To 95% at 45° C (non-condensing)

Operating Altitude

To 5,000 m (16,404 ft)

Non-Operating Altitude

To 12,000 m (39,000 ft)

Shock

30 g 11 msec half-sine on each of 6 sides

Vibration

10 Hz – 55 Hz (0.010 m peak-to-peak excursion)

SCHEMATIC

mjf-212a-schematic-shs-global.png

 

 

ARCHITECT SPECIFICATIONS

 

The loudspeaker shall be a self-powered stage monitor; the transducers shall consist of two 12-inch diameter cone drivers and a 4-inch diaphragm compression driver on a 50-degree symmetrical horn. The loudspeaker system shall incorporate internal processing electronics and a three-channel amplifier, one channel for each driver. Processing functions shall include equalization, phase correction, signal division, and protection for the high- and low-frequency sections. The crossover point shall be 1600 Hz.

Each amplifier channel shall be class AB/H with complementary MOSFET output stages. Burst capability for the low-frequency channels shall be 500 watts total with nominal 2-ohm resistive load and 275 watts for the high-frequency channel with nominal 8-ohm resistive load. Peak power shall be 2550 watts. Distortion (THD, IM, TIM) shall not exceed 0.02%.

Performance specifications for a typical production unit shall be as follows, measured at 1/3-octave resolution: Operating frequency range shall be 55 Hz to 18 kHz. Phase response shall be ±45° from 500 Hz to 16 kHz. Maximum peak SPL shall be 139 dB at 1-meter, half-space loading. Coverage shall be 50 degrees by 50 degrees.

The audio input shall be electronically balanced with a 10 k Ω impedance and accept a nominal 0 dBV (1 V rms, 1.4 V pk) signal. Connector shall be XLR (A-3) type female with parallel looping Male or VEAM all-in-one multipin connector. RF filtering shall be provided, and CMRR shall be greater than 80 dB from 50 Hz to 500 Hz. The internal power supply shall perform automatic voltage selection, EMI filtering, soft current turn-on and surge suppression. Powering requirements shall be nominal 100, 110 or 230 V AC line current at 50 or 60 Hz. UL and CE operating voltage range shall be 100 to 240 V AC. Maximum peak current draw during burst shall be 7.90 A at 115 V AC, 4.10 A at 230 V AC, and 9.24 A at 100 V AC. Current inrush during soft turn-on shall not exceed 10 A at 115 V AC. AC power connectors shall be PowerCon with looping capabilities or VEAM all-in-one multi-pin connector.

The loudspeaker system shall provide facilities for installing Meyer Sound’s optional RMS remote monitoring system. All components shall be mounted in an acoustically vented wedge-shaped enclosure constructed of premium birch plywood with a black textured hard-shell finish. The front grille shall be hex stamped steel with black mesh screen. Dimensions shall be 27.07" wide x 16.11" high x 23.00" deep (688 mm x 409 mm x 584 mm). Weight shall be 108 lbs (49 kg). The enclosure front angle shall be 40 degrees.

 

Product Videos

Engineers on Mixing Judas Priest on Meyer Sound Line Arrays and MJF-212A Monitors 04:27

On Judas Priest's final world tour, FOH engineer Martin Walker and Parnelli Award-winning monitor engineer Kevin Tater McCarthy travel throughout Europe, South America, and Canada to mix the classic English rock band. The touring audio package provided by Major Tom (UK) includes a Meyer Sound MILO and 700-HP system, DiGiCo SD7 console at FOH, Yamaha PM5D at monitors, Shure microphones, along with JH Audio in-ear monitors. About the sound on the tour: http://www.meyersound.com/news/2011/judas_priest/ Judas Priest: http://judaspriest.com/ Major Tom: http://www.majortom.cc/ Meyer Sound: http://www.meyersound.com

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Other Details

Location:
United States
Warranty:
Limited warranty
Sales Questions?:

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