Mjf-212a specifications architect specifications – Meyer Sound MJF-212A User Manual

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MJF-212A specifications

architect specifications

meyer sound laboratories inc.
2832 San Pablo Avenue
Berkeley, CA 94702

T: +1 510 486.1166
F: +1 510 486.8356

[email protected]
www.meyersound.com

MJF-212A - 04.157.004.03 A2

Operating Frequency Range

Frequency Response

Phase Response

Maximum Peak SPL

Dynamic Range

Low Frequency

High Frequency

Type

Maximum Common Mode Range

Connectors

Input Impedance

Wiring

DC Blocking

CMRR

RF Filter

TIM Filter

Nominal Input Sensitivity

Input Level

Type

Output Power

Total Output

THD, IM, TIM

Load Capacity

Cooling

Connector

Voltage Selection

Safety Agency Rated Operating Range

Turn-on and Turn-off Points

Current Draw: Idle Current

Max Long-Term Continuous Current (>10 sec)

Burst Current (<1 sec)

Ultimate Short-Term Peak Current Draw

Inrush Current

55 Hz - 18 kHz
60 Hz - 16 kHz ±4 dB
500 Hz - 16 kHz ±45°
139 dB
>110 dB

50° symmetrical

1600 Hz

Two high-power 12" cone drivers with neodymium magnets
Nominal impedance: 2

Ω

Voice coil size: 4"
Power handling capability: 1200 W (AES)

4" compression driver
Nominal impedance: 8

Ω

Voice coil size: 4"
Diaphragm size: 4"
Exit size: 1.5"
Power handling capability: 250 W (AES)

Differential, electronically balanced
±15 V DC, clamped to earth for voltage transient protection
Female XLR input with male XLR loop output or VEAM all-in-one
connector (integrates AC, audio, and network)
10 k

Ω

differential between pins 2 and 3

Pin 1: Chassis/earth through 220 k

Ω

, 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
Differential DC blocking up to max common mode voltage
>50 dB, typically 80 dB (50 Hz–500 Hz)
Common mode: 425 kHz; Differential mode: 142 kHz
Integral to signal processing (<80 kHz)
0 dBV (1 V rms, 1.4 V pk) continuous is typically the onset of limiting
for noise and music
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

Three-channel complementary MOSFET output stages (class AB/H)
1275 W (three channels; 2 x 500 W, 1 x 275 W)
2550 W peak
<.02%
2

Ω

low channels; 8

Ω

high channel

Convection

PowerCon with looping output or VEAM
Automatic, two ranges, each with high-low voltage tap
(uninterrupted)
95 V AC - 125 V AC; 208 V AC - 235 V AC, 50/60 Hz
85 V AC - 134 V AC; 165 V AC - 264 V AC
0.650 A rms (115 V AC); 0.310 A rms (230 V AC); 0.760 A rms (100 V AC)
4.67 A rms (115 V AC); 2.37 A rms (230 V AC); 5.25 A rms (100 V AC)
7.90 A rms (115 V AC); 4.10 A rms (230 V AC); 9.24 A rms (100 V AC)
20 A pk (115 V AC); 10 A pk (230 V AC); 21.8 A pk (100 V AC)
10 A pk (115 and 100 V AC); 18 A pk (230 V AC)

Equipped with two-conductor twisted-pair network, reporting all
operating parameters of amplifiers to system operator’s
host computer

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%.

Notes:

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 kOhm

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.

The loudspeaker shall be the Meyer Sound MJF-212A.

1. Recommended maximum operating

frequency range. Response depends
on loading conditions and room
acoustics.

2. Half-space loading measured with

1/3-octave frequency resolution at 4
meters.

3. Measured with music, half-space

loading, referred to 1 meter.

4. At this frequency, the transducers

produce equal sound pressure levels.

5. Power handling is measured under

AES standard conditions: transducers
driven continuously for two hours
with band limited noise signal having
a 6 dB peak-average ratio.

6. Amplifier wattage rating based on

the maximum unclipped burst sine-
wave rms voltage that the amplifier
will produce for at least 0.5 seconds
into the nominal load impedance.

7. Peak power based on the maximum

unclipped peak voltage that the
amplifier will produce for at least 100
milliseconds into the nominal load
impedance.

8. AC power cabling must be of sufficient

gauge so that under burst current rms
conditions, cable transmission losses
do not drop voltage below specified
operating range at the speaker.

European Office:

Meyer Sound Lab. GmbH

Carl Zeiss Strasse 13

56751 Polch, Germany

Made by Meyer Sound Laboratories

Berkeley, California USA

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Acoustical

Coverage

Crossover

Transducers

Audio Input

Amplifier

AC Power

RMS Network (optional)