Meyer Sound MM-4 Datasheet page 2

MM-4 specifications
Acoustical
(MM-4CEU required) 1 Operating Frequency Range 2
Maximum Continuous SPL 5
Coverage
Transducer
MM-4CEU Control Electronics Unit (required)
Audio Input
Maximum Common Mode Range
Audio Output
Audio Performance
AC Power
Physical
SpeakerSense Connectors 7
architect specifications
The loudspeaker system shall consist of a single 4-inch (102
mm) diameter cone transducer with a 100 watt (AES), 16-ohm,
long-excursion voice coil with air-cooled ceramic magnet
structure and mounted in a sealed aluminum enclosure that
provides heat sinking for the transducer's voice coil. The
aluminum enclosure shall have exterior dimensions of 40-inch
(102 mm) wide by 4-inch (102 mm) high by 4.2-inch (107 mm)
deep (including the grille but excluding the connector) and it
shall weigh 3 lbs 14 oz (1.76 kg). The loudspeaker system shall
produce continuous SPL of 100 dB at 1 meter with peak output
of 112.5 dB at 1 meter from 160 Hz to 16 kHz when used with
the required Meyer Sound MM-4CEU control electronics unit
and a third-party audio power amplifier. The power amplifier
shall be a professional grade, direct drive (transformerless
output) power amplifier determined to be capable of stable
long term output of 49 volts rms (70 volts peak) at the rated
load impedance. The loudspeaker system shall be weather
resistant and suitable for sheltered outdoor applications by
120 Hz - 18 kHz
Frequency Response 3
160 Hz - 16 kHz ±4 dB
Phase Response
700 Hz - 17 kHz ±45°
Maximum Peak SPL 4
112.5 dB
100 dB
Horizontal
80° (3 kHz - 14 kHz ±10°); 120° (below 2 kHz)
Vertical
80° (3 kHz - 14 kHz ±10°); 120° (below 2 kHz)
One 4" cone driver
Nominal impedance: 16
Voice coil size: 0.75"
Power-handling capability: 100 W (AES) 6
Type
Differential, electronically balanced; RF and transient protected
±15 V DC, clamped to earth for voltage transient protection
Connector(s)
Two female XLR, one for each input channel
Input Impedance Ω
10 k differential between pins 2 and 3
Wiring
Pin 1: Chassis/earth through 11 k
provide virtual ground lift at audiofrequencies; Pin 2: Signal +;
Pin 3: Signal -; Case: Earth ground and chassis
DC Blocking
None
CMRR
>60 dB, typically 80 dB (50 Hz - 1 kHz)
RF Filter
Common mode 850 kHz; differential mode 370 kHz
Input Level
Maximum input voltage 25 V peak-peak (+21 dBu sine wave)
Type
Active push-pull, electronically balanced, capable of driving
600 Ω load; RF and transient protected
Out Voltage
Maximum 50 V peak-peak (+27 dBu sine wave)
Connectors
Two male XLR, one for each output channel
Output Impedance
200 Ω differential between pins 2 and 3
Wiring
Pin 1: Chassis/earth; Pin 2: Signal +; Pin 3: Signal -
Hum and Noise
<-90 dBV (A-weighted)
Dynamic Range
>115 dB
THD
<0.01%, typically <.002%
Response Accuracy
<0.25 dB (20-20 kHz)
Connector
IEC 320
Voltage Selection
Switch selectable on rear panel
UL/CE Rated Voltage
90 - 130 V AC; 180 -260 V AC; 50/60 Hz
Current Draw
0.160 A max (rear panel T 160 mA fuse protected)
LED Indicators
Sense Threshold/Gain Detect: (2) Red/Green LEDs, one per channel;
RMS Limiters: (2) Yellow LEDs, one per channel; Peak Limiters:
(2) Yellow LEDs, one per channel; Power: (1) Green LED
Controls
Front panel: (2) Rotary input attenuators, one per channel;
(2) Recessed low cut filter switches, one per channel;
(1) AC power latching push switch
Rear Panel: (1) AC voltage selector, recessed; (1) T250V fuse and holder
MultiSense, (4) dual banana, two per channel
Physical Dimensions
19.00" w x 1.75" h x 7.75" d standard rack mount (482 mm x 44 mm x 197 mm)
Weight
8 lbs, 4 oz (3.74 kg)
Finish
Black, powder coated
virtue of an aluminum enclosure, special sealants, watertight
connector and chemically treated transducer cone.
loudspeaker enclosure shall be fitted with a 3/8-inch threaded
insert on two of the four sides to facilitate installation and shall
have a removable back plate for driver servicing, secured with
four Phillips screws.
The loudspeaker shall be the Meyer Sound MM-4 miniature
wide-range loudspeaker.
The control electronics unit (CEU) shall be a single rack space
processor providing two separate channels with required
frequency response optimization filters, phase alignment
and required protection limiters specifically designed for the
MM-4 loudspeaker system. The CEU shall provide RMS and
peak limiting to the audio signal feeding the power amplifier
when activated by a driver protection circuit that senses the
power amplifier output. The sensing circuit shall allow each
channel of the CEU to drive several power amplifier channels
Ω
Ω
, 1000 pF, 15 V clamp network to
The
Notes:
1. To realize the MM-4's full
capabilities, an MM-4CEU must
be used. The amplifier driving the
loudspeakers should be capable
of 49 volts RMS at the rated load
impedance, and provide a voltage
gain between 10 and 30 dB (20
dB for optimal S/N ratio and
protection). The power rating of
the amplifier should be as follows:
1 MM-4/ch (16 Ω) 150 W
2 MM-4/ch (8 Ω) 300 W
4 MM-4/ch (4 Ω) 600 W
8 MM-4/ch (2 Ω) 1200 W
2. Recommended maximum operating
frequency range. Response
depends on loading conditions and
room acoustics.
3. Free field, measured with one-
third octave frequency resolution
at 4 meters.
4. Measured with pink noise at 1
meter.
5. Measured at 1 meter, driven
continuously for two hours with
pink noise signal having a 12.5 dB
peak-average ratio.
6. Power handling is measured
under AES standard conditions:
transducer driven continuously
for two hours with band-limited
noise signal having a 6 dB peak-
average ratio. Aluminum enclosure
dissipates heat generated by
driver.
7. When using multiple sense lines,
all lines must be in same electrical
polarity.
Made by Meyer Sound Laboratories
Berkeley, California USA
European Office:
Meyer Sound Lab. GmbH
Carl Zeiss Strasse 13
56751 Polch, Germany
MM-4 - 04.091.033.01 C
Copyright © 2007
Meyer Sound Laboratories Inc.
All rights reserved
meyer sound laboratories inc.
2832 San Pablo Avenue
Berkeley, CA 94702
T: +1 510 486.1166
F: +1 510 486.8356
info@meyersound.com
www.meyersound.com
and to sense two power amplifier outputs at one time such
that the highest level (voltage) branch of an MM-4 distributed
loudspeaker system will not exceed the power handling of
the drivers and will actuate system protection circuits. A
recessed front-panel low cut boundary EQ filter switch shall
be provided for each channel to allow frequency compensation
to be applied when an optional subwoofer loudspeaker is
employed or for architectural/acoustic boundary conditions.
Each channel of the CEU shall provide a rotary input attenuator,
low-cut filter toggle switch and three LED indicators for signal
level and sense threshold, for the RMS limiter and for the peak
limiter. An on-board regulated power supply shall be included
with externally accessible fuse and all electrical parts shall be
of the highest quality.
The control electronics unit (CEU) shall be the Meyer Sound
MM-4CEU.
MM-4CEU
MM-4CEU