Filter
Top Products
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
techsupport@meyersound.com
www.meyersound.com
MJF-212A - 04.157.004.03 A2
Copyright © 2007
Meyer Sound Laboratories Inc.
All rights reserved
Operating Frequency Range
1
Frequency Response
2
Phase Response
Maximum Peak SPL
3
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
6
Total Output
7
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)
8
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)
5
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
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 kΩ differential between pins 2 and 3
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
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
o
f
N
o
r
t
h
A
m
e
r
i
c
a
,
I
n
c
.
C
US
T
U
V
R
h
e
i
n
l
a
n
d
Acoustical
Coverage
Crossover
4
Transducers
Audio Input
Amplifier
AC Power
RMS Network (optional)