Meyer Sound Speaker MM 4CEU User Manual

OPERATING INSTRUCTIONS  
INDUSTRIAL SERIES  
MM-4 Miniature Wide-Range Loudspeaker  
MM-4CEU Control Electronics Unit  
Keep these important operating instructions.  
 
SymbOLS USED  
These symbols indicate important safety or operating features in this booklet and on the chassis:  
Dangerous voltages: risk of  
electric shock  
Important operating  
instructions  
Frame or chassis  
Masse, châssis  
Protective earth ground  
Terre de protection  
Pour indiquer les risques  
résultant de tensions  
dangereuses  
Pour indequer important  
instructions  
Zu die gefahren von  
gefährliche spanning zeigen  
Zu wichtige betriebs-  
anweisung und unter-  
haltsanweisung zeigen  
Rahmen oder chassis  
Armadura o chassis  
Die schutzerde  
Para indicar voltajes  
peligrosos.  
Instrucciones importantes  
de funcionamiento y/o  
manteniento  
Tierra proteccionista  
ImPORTANT SAfETy INSTRUCTIONS  
1. Read these instructions.  
2. Keep these instructions.  
3. Heed all warnings.  
11. Only use attachments/accessories specified by Meyer  
Sound.  
12. Use only with the caster rails or rigging specified by  
Meyer Sound, or sold with the loudspeaker. Handles  
are for carrying only.  
4. Follow all instructions.  
5. Do not use this loudspeaker near water.  
6. Clean only with dry cloth.  
13. Unplug this loudspeaker during lightning storms or  
when unused for long periods of time.  
14. Refer all servicing to qualified service personnel.  
Servicing is required when the loudspeaker has been  
damaged in any way, such as when the power-supply  
cord or plug has been damaged; liquid has been  
spilled or objects have fallen into the loudspeaker;  
rain or moisture has entered the loudspeaker;  
the loudspeaker has been dropped; or, when for  
undetermined reasons, the loudspeaker does not  
operate normally.  
7. Do not block any ventilation openings. Install  
in accordance with Meyer Sound's installation  
instructions.  
8. Do not install near any heat sources such as radiators,  
heat registers, stoves, or other apparatus that produce  
heat.  
9. Do not defeat the safety purpose of the grounding-  
type plug. A grounding-type plug has two blades and  
a third grounding prong. The third prong is provided  
for your safety. If the provided plug does not fit into  
your outlet, consult an electrician for replacement of  
the obsolete outlet.  
CAUTION: To reduce the risk of electric  
shock, do not expose this loudspeaker  
to rain or moisture. Do not install the loudspeaker  
in wet or humid locations without using weather  
protection equipment from Meyer Sound.  
10. Protect the power cord from being walked on  
or pinched, particularly at plugs, convenience  
receptacles, and the point where they exit from the  
loudspeaker. The AC mains plug or appliance coupler  
shall remain readily accessible for operation.  
iii  
 
SAfETy SUmmARy  
English  
-
-
Ne pas laisser de l’eau ou tout  
objet pénétrer dans l’haut-parleur.  
Ne pas placer de r´cipients  
Haushaltsgeräten (z.B. Heizgerät  
oder Herd) aufstellen.  
Im Inneren diesem Lautsprecher  
herr-schen potentiell gefährliche  
Spannungen. Nicht versuchen,  
das Gerät zu öffnen. Es  
enthält keine vom Benutzer  
reparierbaren Teile. Reparaturen  
dürfen nur von ausgebildetem  
Kundenienstpersonal durchgeführt  
werden.  
-
To reduce the risk of electric  
shock, disconnect the loudspeaker  
from the AC mains before installing  
audio cable. Reconnect the power  
cord only after making all signal  
connections.  
-
contenant un liquide sur cet  
appareil, ni à proximité de celui-ci.  
Pour éviter une surchauffe de  
l’haut-parleur, conserver-la à  
l’abri du soleil. Ne pas installer à  
proximité d’appareils dégageant  
de la chaleur tels que radiateurs  
ou appareils de chauffage.  
Ce haut-parleur contient des  
circuits haute tension présentant  
un danger. Ne jamais essayer  
de le démonter. Il n’y a aucun  
composant qui puisse être  
-
Connect the loudspeaker to a  
two-pole, three-wire grounding  
mains receptacle. The receptacle  
must be connected to a fuse or  
circuit breaker. Connection to any  
other type of receptacle poses a  
shock hazard and may violate local  
electrical codes.  
-
Español  
-
Para reducir el riesgo de descarga  
eléctrica, desconecte de la red  
de voltaje el altoparlante antes de  
instalar el cable de señal de audio.  
Vuelva a conectar la alimentacion  
de voltaje una vez efectuadas  
todas las interconexiones de  
señalizacion de audio.  
Conecte el altoparlante a un  
tomacorriente bipolar y trifilar  
con neutro de puesta a tierra.  
El tomacorriente debe estar  
conectado a la protección de  
derivación apropiada (ya sea  
un fusible o un disyuntor). La  
conexión a cualquier otro tipo de  
tomacorriente puede constituir  
peligro de descarga eléctrica  
y violar los códigos eléctricos  
locales.  
No instale el altoparlante en  
lugares donde haya agua o  
humedad excesiva.  
No deje que en el altoparlante  
entre agua ni ningún objeto  
extraño. No ponga objetos con  
líquidos encima de la unidad ni  
cerca de ella.  
-
-
Do not install the loudspeaker  
in wet or humid locations  
without using weather protection  
equipment from Meyer Sound.  
Do not allow water or any  
réparé par l’utilisateur. Toutes les  
réparations doivent être effectuées  
par du personnel qualifié et agréé  
par le constructeur.  
foreign object to get inside the  
loudspeaker. Do not put objects  
containing liquid on or near the  
unit.  
Deutsch  
-
-
Um die Gefahr eines elektrischen  
Schlages auf ein Minimum zu  
reduzieren, den Lautsprecher  
vom Stromnetz trennen, bevor  
ggf. ein Audio-Schnittstellensign  
alkabel angeschlossen wird. Das  
Netzkabel erst nach Herstellung  
aller Signalverbindungen wieder  
einstecken.  
Der Lautsprecher an eine  
geerdete zweipolige Dreiphasen-  
Netzsteckdose anschließen.  
Die Steckdose muß mit einem  
geeigneten Abzweigschutz  
(Sicherung oder Leistungsschalter)  
verbunden sein. Der Anschluß  
der unterbrechungsfreien  
Stromversorgung an einen  
anderen Steckdosentyp kann  
zu Stromschlägen führen und  
gegen die örtlichen Vorschriften  
verstoßen.  
Der Lautsprecher nicht an einem  
Ort aufstellen, an dem sie mit  
Wasser oder übermäßig hoher  
Luftfeuchtigkeit in Berührung  
kommen könnte.  
Darauf achten, daß weder  
Wasser noch Fremdkörper in  
das Innere den Lautsprecher  
eindringen. Keine Objekte, die  
Flüssigkeit enthalten, auf oder  
neben die unterbrechungsfreie  
Stromversorgung stellen.  
Um ein Überhitzen dem  
-
-
To reduce the risk of overheating  
the loudspeaker, avoid exposing it  
to direct sunlight. Do not install the  
unit near heat-emitting appliances,  
such as a room heater or stove.  
This loudspeaker contains  
potentially hazardous voltages. Do  
not attempt to disassemble the  
unit. The unit contains no user-  
serviceable parts. Repairs should  
be performed only by factory-  
trained service personnel.  
-
-
-
français  
-
Pour réduire le risque  
d’électrocution, débrancher  
la prise principale de l’haut-  
parleur, avant d’installer le câble  
d’interface allant à l’audio. Ne  
rebrancher le bloc d’alimentation  
qu’après avoir effectué toutes les  
connections.  
-
-
Para reducir el riesgo de  
sobrecalentamiento, no exponga  
la unidad a los rayos directos del  
sol ni la instale cerca de artefactos  
que emiten calor, como estufas o  
cocinas.  
Este altoparlante contiene  
niveles de voltaje peligrosos en  
potencia. No intente desarmar la  
unidad, pues no contiene piezas  
que puedan ser repardas por el  
usuario. Las reparaciones deben  
efectuarse únicamente por parte  
del personal de mantenimiento  
capacitado en la fábrica.  
-
-
-
Branchez l’haut-parleur dans une  
prise de courant à 3 dérivations  
(deux pôles et la terre). Cette  
prise doit être munie d’une  
protection adéquate (fusible ou  
coupe-circuit). Le branchement  
dans tout autre genre de prise  
pourrait entraîner un risque  
d’électrocution et peut constituer  
une infraction à la réglementation  
locale concernant les installations  
électriques.  
-
Lautsprecher zu verhindern,  
das Gerät vor direkter  
Sonneneinstrahlung fernhalten  
und nicht in der Nähe von  
wärmeabstrahlenden  
-
Ne pas installer l’haut-parleur dans  
un endroit où il y a de l’eau ou une  
humidité excessive.  
iv  
 
CONTENTS  
INTRODUCTION  
The MM-4 Miniature Wide-Range Loudspeaker  
The MM-4CEU Control Electronics Unit (Required)  
1
1
ChAPTER 1: Installing the mm-4 Loudspeaker  
3
Using the MUB-MM4 U-Bracket  
Using the MFMA-MM4 Adapter  
Loudspeaker Connections  
Standard Connector  
Weather-Protected Connector  
Effect of Cable Resistance on System Performance  
3
3
3
4
4
4
ChAPTER 2: The mm-4CEU Control Electronics Unit  
5
Frequency and Phase Response Correction  
Driver Protection  
AC Power  
Safety Issues  
Line Level Inputs  
Line Level Outputs  
SpeakerSense Inputs  
MM-4CEU/MM-4 Connection Diagram  
5
5
6
6
6
7
7
8
ChAPTER 3: Choosing a Power Amplifier  
9
Gain  
9
9
9
10  
10  
10  
10  
Protection Circuitry  
Electrical Characteristics  
Power Supply  
About Bridging  
Controlling Zone Levels  
Equalization  
ChAPTER 4: System Design and Optimization Tools  
11  
Meyer Sound MAPP Online Pro™  
SIM® 3 Measurement System  
Source Independent Measurement Technique  
Applications  
11  
11  
12  
12  
APPENDIx A: mm-4 Weather Protected Cable Assembly Procedure 13  
APPENDIx b: mm-4 Specifications  
14  
15  
16  
APPENDIx C: mm-4CEU Specifications  
APPENDIx D: mm-4 EN3 fire Alarm Signaling Specifications  
v
 
vi  
 
INTRODUCTION  
INTRODUCTION  
As you read this manual, you’ll find figures and diagrams  
to help you understand and visualize what you’re reading.  
You’ll also find numerous icons that serve as cues to flag  
important information or warn you against improper or  
potentially harmful activities. These icons include:  
The MM-4 consists of a single 4-inch cone driver with a 16-  
ohm voice coil mounted in a sealed enclosure. Connecting  
directly to your amplifier, the MM-4 draws 150 watts peak  
from the line to produce 112.5 dB peak SPL. Typically, with  
four MM-4 loudspeakers connected in parallel on the line,  
the system requires a direct drive power amplifier capable  
of 600 watts continuous output (49 volts rms) into 4 ohms.  
A NOTE identifies an important or useful  
piece of information relating to the topic  
under discussion.  
The MM-4’s enclosure comes standard with a paintable  
black anodized finish. The enclosure acts as a sink to  
dissipate heat from the driver voice coil, and is fitted with a  
perforated steel grille.  
A TIP offers a helpful tip relevant to the topic  
at hand.  
NOTE: The MM-4 can be ordered custom-  
painted in any color to match your décor.  
A looping, sealed EN3 connector is available for outdoor  
installations, as well as a Phoenix-style keyed connector for  
indoor systems.  
A CAUTION gives notice that an action can  
have serious consequences and could cause  
harm to equipment or personnel, delays, or other  
problems.  
!
ThE mm-4CEU CONTROL ELECTRONICS UNIT  
(REqUIRED)  
A two-channel, single rack unit, the MM-4CEU control  
electronics unit (Figure i.2) provides the required frequency  
and phase response correction circuitry tailored to the  
MM-4 loudspeaker. Through a SpeakerSenseconnection  
to the power amplifier output, the MM-4CEU continuously  
monitors the power applied to the drivers, activating integral  
peak and RMS limiters to protect against over-excursion  
and overheating.  
ThE mm-4 mINIATURE WIDE-RANGE  
LOUDSPEAkER  
The MM-4 miniature wide-range loudspeaker (Figure i.1)  
is a very compact loudspeaker for high-quality distributed  
system applications. In contrast to conventional low power  
70-volt transformer based systems, the MM-4 can produce  
wide-range high sound pressure levels while dramatically  
reducing distortion and easing installation requirements.  
When several amplifiers are used in a system, the  
MM-4CEU’s SpeakerSense connection works by utilizing  
Meyer Sound’s MultiSensetechnology, allowing each  
channel to:  
Drive multiple amplifiers  
Monitor two amplifier channels at once  
Activate protection circuits based on the amplifier  
channel with the highest signal level  
MultiSense allows the levels of individual zones to be  
adjusted using the power amplifier’s attenuators while  
still giving protection to all the loudspeakers on the  
same MM-4CEU channel. Typically, each channel of  
the MM-4CEU can drive 12 or more amplifier channels  
depending on the input impedance of the amplifier.  
Figure i.1. MM-4 miniature wide-range loudspeaker  
Figure i.2. The MM-4CEU front panel  
1
 
INTRODUCTION  
The MM-4CEU is specifically designed and required for  
use in an MM-4 loudspeaker system. In conjunction with  
professional grade amplifiers, the MM-4CEU protects your  
MM-4 loudspeakers against damaging overload conditions,  
while ensuring that they meet their published specifications.  
2
 
CHAPTER 1  
ChAPTER 1: INSTALLING ThE mm-4 LOUDSPEAkER  
The following MM-4 mounting options accoommodate a  
variety of different installation requirements:  
USING ThE mfmA-mm4 ADAPTER  
The optional MFMA-MM4 flush mount adapter allows  
the MM-4 to be used with virtually any ceiling or in-wall  
flush-mount bezel designed to house an 8-inch cone  
loudspeaker. The kit includes two L-brackets that fit the  
bezel’s stud pattern, a grille mask, and associated hardware  
(Figure 1.2).  
The MUB-MM4 U-bracket, which allows the MM-4 to  
be mounted on virtually any flat surface and enables  
you to change the angle of the MM-4 with respect to  
the mounting surface.  
The MFMA-MM4 flush mount adapter, which fits  
standard 8-inch loudspeaker bezels, for flush-mounting  
ceiling or in-wall applications.  
CAUTION: Do not use the Fire Signaling  
MM-4 in air handling spaces.  
!
USING ThE mUb-mm4 U-bRACkET  
The optional MUB-MM4 U-bracket mounts to the two  
threaded inserts in the MM-4 enclosure sides. It uses two  
1/2" long 3/8"-16 stainless steel machine screws, two 1"  
rubber washers, two 1" metal washers, and neoprene strips  
attached to the interior to the U-bracket (Figure 1.1).  
Figure 1.2. Installing the MM-4 into the MFMA-MM4 flush mount adapter  
To install the MM-4 into the MFMA-MM4 flush mount  
adapter:  
1. Gently slide the loudspeaker into the adapter’s housing,  
seating its sides against the attached neoprene strips.  
2. Line up the threaded inserts on the loudspeaker with  
the long guide hole on the housing.  
3. Fasten adapter to loudspeaker using two 1/2" x 3/8"-16  
machine screws, ensuring that the 1" rubber washers  
touch the adapter housing and the 1" metal washers  
support the machine screws.  
4. Tighten the machine screws to secure the loudspeaker  
to the adapter. Do not over-tighten.  
Figure 1.1. Installing the MM-4 into the optional MUB-MM4 U-Bracket  
LOUDSPEAkER CONNECTIONS  
To install the MM-4 into the MUB-MM4 b-Bracket:  
To realize the full capabilities of the MM-4, each loudspeaker  
must be fed with voltage swings up to 49 volts rms (70  
volts peak) from the amplifier driving the line, with all  
loudspeakers in the line connected in parallel. In distributed  
systems, a line with four to eight loudspeakers connected in  
parallel is typically driven with one amplifier channel.  
1. Gently slide the loudspeaker into the bracket, seating  
its sides against the attached neoprene strips.  
2. Line up the threaded inserts on the loudspeaker  
near the top of the long guide hole on the bracket for  
maximum tilting flexibility.  
3. Fasten bracket to loudspeaker using two 1/2" x 3/8"-16  
machine screws, ensuring that the 1" rubber washers  
touch the bracket and the 1" metal washers support the  
machine screws.  
CAUTION: The total load of the MM-4  
loudspeakers connected in parallel should  
not be lower than the minimum allowable load of the  
amplifier. Otherwise, damage to the amplifier and  
loudspeakers may result.  
!
4. Half-tighten the machine screws to the bracket, set  
the angle of the loudspeaker, then tighten the machine  
screws further to secure the loudspeaker to the bracket.  
Do not over-tighten.  
3
 
CHAPTER 1  
Standard Connector  
TIP: The chassis-mount EN3 connectors on  
the MM-4 rear panel are fitted with captive  
plastic caps. If you are not using the second  
connector for looping, use the cap to seal it against  
moisture invasion.  
A Phoenix-style keyed connector is fitted to the indoor  
version of the MM-4 (Figure 1.3). The connector is wired  
with the left terminal as negative (-) and the right terminal  
as positive (+), when viewing the loudspeaker from the rear.  
The Phoenix cable mount connector accepts conductors up  
to 12 AWG (American Wire Gauge) or 2.5 mm2.  
EffECT Of CAbLE RESISTANCE ON SySTEm  
PERfORmANCE  
When specifying loudspeaker cable for an MM-4 installation,  
it is important to take into account the total (loop) conductor  
resistance, since this can affect both peak SPL capability  
and, at the extreme, system frequency response.  
As a rule, MM-4 systems will exhibit 1/2 dB peak SPL loss  
for every ohm of total loop wiring resistance. Accordingly,  
12 ohms of cable resistance will result in a 6 dB peak SPL  
loss. MM-4 systems can tolerate up to 20 ohms total cable  
resistance before the frequency response is affected.  
Figure 1.3. Rear panel of the indoor version of the MM-4  
You may want to keep the loop resistance of an MM-4  
system below 1 ohm to avoid loss of peak SPL capability.  
Tables 1.1 and 1.2 give resistance (in ohms) per 1000 feet  
and kilometers, respectively, per conductor for standard  
AWG and metric wire gauges. For total resistance, multiply  
the length of the cable by two (two conductors).  
TIP: It is possible to loop several MM-4 loud-  
speakers together using two wires connected  
to each terminal of the connector.  
Table 1.1 AWG Wire Resistance for Various Gauges  
Weather-Protected Connector  
Cable Gauge (AWG)  
Resistance (Ω/1000 ft)  
Sealed EN3 connectors are fitted to the weather-protected,  
outdoor version of the MM-4. In addition to a dedicated  
input connector, a loop out connector is provided for looping  
several MM-4 loudspeakers. The input connector is wired  
with the left terminal as negative (-) and the right terminal  
as positive (+), when viewing the loudspeaker from the  
rear (Figure 1.4). The EN3 cable mount connector accepts  
conductors up to 16 AWG (1.5 mm2) and an outside jacket  
diameter of 0.265 inches (6.73 mm).  
22  
20  
18  
16  
14  
12  
10  
17.5  
10.9  
6.92  
4.35  
2.73  
1.71  
1.08  
Table 1.2 metric Wire Resistance for Various Gauges  
Cable Gauge (mm2)  
Resistance (Ω/km)  
0.5  
0.75  
1
33.23  
22.37  
17.11  
11.25  
6.75  
1.5  
2.5  
4
4.277  
2.864  
6
Figure 1.4. Rear panel of the weather-protected version of the MM-4  
TIP: For very long runs, you can use a larger  
cable for most of the length of the run, then  
terminate with the appropriate gauge listed above  
for the connector.  
NOTE: The EN3 displays a small dot just  
above Pin 1, the negative terminal. See  
Appendix A for more information on wiring.  
4
 
CHAPTER 2  
ChAPTER 2: ThE mm-4CEU CONTROL ELECTRONICS UNIT  
The MM-4CEU is a required component for every MM-4  
installation. It performs a number of important signal-  
processing functions to ensure that the MM-4 meets its  
published specifications and is protected against damaging  
overload conditions.  
DRIVER PROTECTION  
The MM-4CEU features Meyer Sound’s SpeakerSense  
driver protection circuitry. Through a connection back from  
the power amplifier output, the MM-4CEU’s SpeakerSense  
function monitors the continuous and peak power being  
applied to the MM-4 drivers. Meyer Sound’s MultiSense  
function then allows each MM-4CEU channel to monitor  
two amplifier outputs, assuring that the protection circuits  
are activated by the signal branch with the highest gain.  
This allows the MM-4CEU to protect the MM-4 in the  
following ways:  
The MM-4CEU mounts in a standard 19-inch relay rack and  
occupies a single rack space (1.75 inches). Each MM-4CEU  
provides two channels of signal processing, both capable  
of driving several amplifier channels and monitoring two  
separate amplifier channels for protection (four amplifier  
channels total per MM-4CEU). Each channel of the  
MM-4CEU features an independent signal level attenuator  
and low cut switch.  
When the continuous power exceeds the MM-4’s safe  
limits, the MM-4CEU introduces an RMS limiter that  
clamps the audio signal to protect the MM-4 driver from  
damage due to overheating.  
NOTE: See Chapter 3, “Choosing a Power  
Amplifier,” for important details about  
choosing and configuring an amplifier for use with  
the MM-4CEU.  
When the peak power exceeds the MM-4’s safe limits,  
the MM-4CEU introduces a fast-acting peak limiter to  
clamp the signal level and protect the MM-4 driver from  
excessive excursion.  
The functions of the SpeakerSense circuitry are indicated  
on the MM-4CEU front panel by the following LEDs on each  
channel:  
fREqUENCy AND PhASE RESPONSE  
CORRECTION  
The MM-4CEU incorporates multiple-pole frequency  
response equalization circuitry that is tailored specifically  
to the MM-4 loudspeaker’s acoustical characteristics. This  
circuitry assures that the MM-4’s response remains within  
4 dB from 160 Hz to 16 kHz (free field). Integral phase  
response correction circuits maintain a system phase  
response of 45° from 700 Hz to 17 kHz.  
Peak Limit — During peak limiting, the Peak Limit LED  
glows yellow.  
RMS Limit — During RMS limiting, the RMS Limit LED  
glows yellow.  
Sense — When sensing, the MM-4CEU may display  
one of two LED colors:  
The MM-4CEU also provides an independent front-  
panel low-cut switch for each signal channel. This switch  
introduces a high-pass function that can be used to  
compensate for low-frequency boost due to half-space  
loading in flush-mounted configurations. It can also  
augment the MM-4 loudspeaker’s headroom when used  
with a subwoofer for music reproduction.  
-
-
When the signal is sensed back through the  
SpeakerSense connection, the LED glows green.  
When the gain of the amplifier is below 10 dB or  
above 30 dB, the LED flashes red, indicating that  
the protection will not work properly.  
When a channel returns to normal, limiting ceases. The  
LED for that channel is inactive, indicating MM-4CEU is not  
currently limiting.  
NOTE: See the section “Equalization” in  
Chapter 3, “Choosing a Power Amplifier,” for  
more information on using the low-cut switch on the  
MM-4CEU.  
5
 
CHAPTER 2  
Do not use a ground-lifting adapter or cut the AC cable  
ground pin.  
AC POWER  
The MM-4CEU accommodates international power  
standards in two ranges: 90 to 130 V AC and 180 to 260 V  
AC, 50/60 Hz. A rear-panel switch selects between the two.  
CAUTION: Be sure to select the correct  
range for your local power standard before  
connecting and operating the MM-4CEU.  
!
Use the AC cable wiring diagram, illustrated in Figure 2.1, to  
create international or special-purpose power connectors:  
Keep all liquids away from the MM-4CEU to avoid  
hazards from electrical shock.  
Do not operate the unit if the power cables are frayed or  
broken.  
brown = hot  
blue =  
neutral  
yellow/green =  
earth ground  
(chassis)  
LINE LEVEL INPUTS  
Each MM-4CEU input presents a 10 kOhms balanced  
impedance to a three-pin XLR female connector wired as  
follows:  
Figure 2.1. AC cable color codes  
Pin 1 — 11 kΩ to chassis and earth ground (ESD  
clamped)  
If the colors referred to in the diagram don’t correspond to  
the terminals in your plug, use the following guidelines:  
Pin 2 — Signal +  
Connect the blue wire to the terminal marked with an N  
or colored black.  
Pin 3 — Signal -  
Connect the brown wire to the terminal marked with an  
Case — Earth (AC) ground and chassis  
L or colored red.  
Connect the green and yellow wire to the terminal  
marked with an E or colored green (or green and  
yellow).  
NOTE: Pins 2 and 3 are differentially  
balanced, so the polarity applied to the input  
XLR connectors on the MM-4CEU will be replicated  
on the output XLR connectors. Amplifier XLR  
polarity, along with its output wiring, will determine  
the polarity of the entire system.  
SAfETy ISSUES  
Pay close attention to these important electrical and safety  
issues.  
Use standard audio cables with XLR connectors for  
balanced signal sources. Telescopic grounding (Pin 1  
disconnected on one end) is not recommended.  
The MM-4CEU requires a grounded outlet.  
A single source can drive multiple MM-4CEUs with  
paralleled inputs. To avoid distortion from the source,  
make sure the source equipment provides an adequate  
drive circuit design for the total paralleled load impedance  
presented by the paralelled processors. The input  
impedance for a single MM-4CEU is 10 kOhms: if n  
represents the number of MM-4CEUs, paralleling the inputs  
of n MM-4CEUs loudspeakers will produce a balanced  
input load of 10 kOhms divided by n.  
Earth ground  
Chassis ground  
For example, cascading an array of 10 MM-4CEUs  
produces an input impedance of 1000 ohms (10 kOhms  
divided by 10), indicating that the source equipment should  
have an output impedance of 100 ohms or less.  
6
 
CHAPTER 2  
SPEAkERSENSE INPUTS  
NOTE: Most source equipment is safe for  
For each MM-4CEU channel, connect a cable from the  
amplifier output to the corresponding SpeakerSense  
input. If you are driving multiple amplifier channels from a  
single MM-4CEU output and using MultiSense, connect  
the two amplifier output channels with the highest gain  
(not to exceed 30 dB of amplification gain) to a separate,  
corresponding SpeakerSense input.  
driving loads no smaller than 10 times the  
source’s output impedance.  
For source equipment with driving capability of 600 ohms,  
16 MM-4CEUs could be safely driven in parallel (10 kOhms  
divided by 16 equals 625).  
CAUTION: Shorting any input connector pin  
to the chassis can create a ground loop and  
cause hum.  
!
CAUTION: When using MultiSense, make  
sure the two amplifier channels with the  
highest gains are the ones connected to each of the  
!
MM-4CEU's two SpeakerSense inputs.  
TIP: If abnormal noise (hum, hiss, popping) is  
produced from the loudspeaker, disconnect  
the audio source from the MM-4CEU. If the noise  
stops, the problem is not with the MM-4CEU; check  
the audio input and AC power.  
CAUTION: When using MultiSense, both  
amplifier outputs MUST be connected with  
the same polarity. Observe the polarity labels on the  
MM-4CEU rear panel.  
!
LINE LEVEL OUTPUTS  
mm-4CEU/mm-4 CONNECTION DIAGRAm  
The MM-4CEU features push-pull outputs capable of  
driving 600 ohms and using three-pin XLR male connectors  
wired as follows:  
Figure 2.2 on the following page illustrates a typical  
MM-4CEU connection using four 2-channel amplifiers and  
32 MM-4 loudspeakers.  
Pin 1 — Earth ground/chassis  
Pin 2 — Signal +  
Pin 3 — Signal -  
NOTE: The MM-4CEU is a balanced pass-  
through device (balanced signal in - balanced  
signal out) and therefore has no effect on the  
polarity of the signal it receives. Amplifier XLR  
polarity, along with its output wiring, will determine  
the polarity of the entire system.  
Use standard audio cables with XLR connectors for  
driving balanced signal inputs. Telescopic grounding (pin  
1 disconnected on one end) is not recommended. Each  
MM-4CEU output can drive multiple power amplifier  
signal inputs in parallel, to a minimum load impedance of  
600 ohms. Refer to your power amplifier specifications  
to determine input impedance and calculate the net  
impedance of multiple paralleled amplifier inputs. For  
example, one channel of a MM-4CEU could drive 20  
amplifier channels with 12 kOhms input impedance (600  
ohms total impedance).  
7
 
CHAPTER 2  
NOTE: Amplifiers #1 and #2 are the  
amplifiers with the highest gain.  
Channel 2 SpeakerSense  
Channel 1 SpeakerSense  
Figure 2.2. Connecting the MM-4CEU control electronics unit  
8
 
CHAPTER 3  
ChAPTER 3: ChOOSING A POWER AmPLIfIER  
The MM-4 is designed for high-quality distributed sound  
NOTE: Some manufacturers express the gain  
of their amplifiers in voltage gain as a factor  
instead of gain in dB. To covert the voltage gain in  
dB, use the following equation:  
systems. To realize the MM-4’s full capabilities, a direct-  
drive power amplifier capable of 49 volts rms (70 volts  
peak) at the rated load impedance presented by the line  
configuration is required. The MM-4 presents a nominal  
load of 16 ohms, and each unit must be wired in parallel  
with the line. As shown in Table 3.1, the number of MM-4  
loudspeakers on a given signal branch can be used to  
determine the required power rating for the corresponding  
amplifier.  
Gain (in dB) = 20 Log (Voltage Gain)  
For example, a voltage gain of "x20" equates to  
26 dB of gain.  
Table 3.1 Amplifier Power  
PROTECTION CIRCUITRy  
Number of MM-4 Loudspeakers Continuous Power Rating  
Avoid amplifiers with extra “sensing” connections for load  
protection; the MM-4CEU incorporates all the protection  
circuitry necessary for reliable performance. A basic,  
reliable, professional grade amplifier is all that is required.  
1 (16 Ω load)  
2 (8 Ω load)  
3 (5.3 Ω load)  
4 (4 Ω load)  
8 (2 Ω load)  
150 W  
300 W  
450 W  
600 W  
1200 W  
The amplifier must be AC coupled to the load (i.e. protected  
from producing DC at its output). The MM-4 is directly  
coupled to the distribution line, and any significant DC  
voltage on the line may damage the driver. A relay or  
crowbar circuit to open or short the amplifier output in fault  
conditions are preferred.  
CAUTION: The total load of the MM-4  
!
loudspeakers connected in parallel should  
not be lower than the minimum allowable load of the  
amplifier. Otherwise, damage to the amplifier and  
loudspeakers may result.  
ELECTRICAL ChARACTERISTICS  
Slew rate should be at least 10 volts/microsecond; 30 volts/  
microsecond or better is preferred.  
The following sections discuss important criteria for  
choosing and configuring power amplifiers for use with an  
MM-4 and MM-4CEU distributed system.  
The amplifier must be stable under all load conditions  
— shorted, open, inductive or capacitive. Hum and noise  
should be such that when the amplifier input is shorted,  
noise from the loudspeaker is indiscernible. Distortion (THD  
or IM) should be equal to or better than 0.01 percent.  
GAIN  
The gain setting of the power amplifier is crucial to  
system performance: if the gain is set too low, “upstream”  
equipment may clip before the amplifier reaches full power.  
Conversely, if the gain is set too high, not only will system  
noise increase, the amplifier is capable of overcoming  
the MM-4CEU’s protection circuits and may damage the  
loudspeakers.  
Balanced inputs are required. Input connectors should be  
XLR-type (preferred) or TRS (tip, ring, sleeve) type 1/4-inch  
phone female connectors.  
The MM-4CEU is a balanced pass-through device  
(balanced signal in - balanced signal out) and therefore has  
no effect on the polarity of the signal it receives. Amplifier  
XLR polarity, along with its output wiring, will determine the  
polarity of the entire system. For example, an amplifier with  
input as Pin 2 (+) and Pin 3 (-) on the XLR connector, with  
the output terminal (+) of the amplifier connected to the  
terminal (+) of the MM4 loudspeaker connector, will produce  
a positive pressure pulse when a positive voltage pulse is  
applied to Pin 2 of the MM-4CEU input XLR.  
The MM-4CEU is designed to work with amplifiers having  
gain of between 10 dB and 30 dB.  
NOTE: The optimal amplifier gain setting for  
the MM-4CEU is 20 dB.  
The gain of an amplifier can be measured with an rms volt  
meter by feeding the amplifier with a tone generator at  
1 kHz and measuring the input voltage going in (V in) and  
the voltage delivered at the output (V out) and applying the  
following expression:  
Gain (in dB) = 20 Log (V out / V in)  
9
 
CHAPTER 3  
With the amplifier attenuators set to maximum (making sure  
the gain does not exceed 30 dB), first use the MM-4CEU  
level controls to set zone levels. Where a single MM-4CEU  
channel controls several zones (using MultiSense), use the  
individual amplifier channel attenuators to adjust individual  
zones.  
POWER SUPPLy  
Some amplifiers are designed so that the internal power  
supply rails sag as the load current increases. While the  
amplifier’s rated continuous output at a given load may  
appear high, its peak output voltage varies with the load  
impedance. Because a loudspeaker’s impedance changes  
with frequency, such an amplifier will clip prematurely at  
low points in the loudspeaker’s impedance curve, and may  
deliver too high a voltage at high impedance points. Both  
possibilities are potentially damaging to the loudspeaker.  
CAUTION: When using multiple amplifiers  
and if adjustments are made on the amplifier  
!
channels, make sure that the two amplifier channels  
with the highest gains are the ones connected to  
each of the MM-4CEU's two SpeakerSense inputs.  
A “stiff” power supply therefore assures the best  
performance. One indicator of a stiff supply is that the  
amplifier’s wattage rating doubles each time the load  
impedance is halved (as shown in Table 3.1). An amplifier’s  
supply is sufficiently stiff for the MM-4 if its no-load peak  
output (at clipping) drops no more than 5 volts when the  
amplifier is connected to an 8-ohm load.  
EqUALIZATION  
For best results, Meyer Sound's Galileo 408 or Galileo 616  
are recommended; for high-resolution measurement  
(strongly recommended), the preferred tool is Meyer  
Sound’s SIM®. Equalize zones individually, where adjacent  
zones overlap significantly (which is not normally preferred  
in distributed systems), checking the overlap zone and  
adjusting as necessary to provide the smoothest transition  
between zones.  
AbOUT bRIDGING  
When a power amplifier operates in bridged mode, the  
polarity of one output is reversed with respect to the other  
output, and both are fed the same input signal. The load  
is connected between the channel 1 and channel 2 “hot”  
terminals.  
When the MM-4 is mounted against a wall surface or in  
a flush-mounting bezel, half-space loading may cause  
low-frequency extension and boost. In voice-only paging  
systems, low-frequency boost is to be avoided, since it  
can harm intelligibility. Use the MM-4CEU Lo-Cut switch to  
compensate for half-space loading effects.  
If you wish to use bridged amplifiers in your MM-4 system,  
check your amplifier’s documentation to make sure which  
input is used for signal, and which is the + output terminal  
(positive voltage out for positive input voltage applied).  
The Lo-Cut switch may also be used to increase headroom  
when the MM-4 is used with subwoofers for music  
reinforcement. Consult your subwoofer’s documentation for  
detailed information about crossover optimization.  
CAUTION: In bridged mode, an amplifier's  
minimum allowable load is twice that of each  
!
output in dual channel configuration. For example,  
if an amplifier is rated for a 4-ohm load, then the  
minimum in bridged mode should be 8 ohms.  
Trying to drive a 4-ohm load with such an amplifier  
in bridged mode will cause “current clipping” and  
could damage the loudspeakers.  
TIP: Systems with subwoofers will almost  
always require high-resolution measurement  
and equalization to achieve the best results,  
because low frequencies are most affected by  
boundary conditions and localized acoustic  
phenomena such as resonance.  
CONTROLLING ZONE LEVELS  
In a typical MM-4 distributed installation, there are two  
options for adjusting the level in a coverage zone:  
1. The corresponding MM-4CEU “Attn dB” control  
(input attenuation), which will adjust the level of all the  
amplifiers fed by that channel of the processor  
2. The corresponding amplifier channel attenuators, which  
will adjust the level of all the loudspeakers fed by that  
amplifier channel  
10  
 
CHAPTER 4  
ChAPTER 4: SySTEm DESIGN AND INTEGRATION TOOLS  
Meyer Sound offers two comprehensive tools to assist you  
NOTE: To use MAPP Online Pro, you will  
need to register by clicking the “Apply for  
with the acoustical and functional requirements of system  
design and optimization. This chapter introduces you to  
MAPP Online Pro, Meyer Sound’s powerful online acoustical  
prediction tool, and SIM 3, a robust instrumentation package  
for system measurement, analysis, and more.  
MAPP Online Pro” button on the Web page listed  
previously, or the “MAPP Online Pro” button on  
approval, an email will be sent to you with a user  
name and password along with the URL where you  
can download MAPP Online Pro. Online instructions  
will guide you through the download and setup  
process.  
mEyER SOUND mAPP ONLINE PRO  
Based on a patented method, MAPP Online Pro is a  
powerful, cross-platform, Java-based application for  
accurately predicting the coverage pattern, frequency  
response, impulse response, and maximum SPL output of  
single or arrayed Meyer Sound loudspeakers.  
When a prediction is requested, data are sent over the  
Internet to a high-powered server at Meyer Sound running  
a sophisticated acoustical prediction  
algorithm using high-resolution,  
complex (magnitude and phase)  
polar data. Predicted responses  
are returned over the Internet and  
displayed on the local computer in  
color.  
With mAPP Online Pro, you can:  
Run multiple “what if” scenarios  
in minutes to refine your system  
design for best coverage of the  
intended audience area  
Clearly see interactions among  
loudspeakers to help minimize  
destructive interference by  
re-aiming the loudspeakers or  
adjusting the position  
Place microphones anywhere in  
the sound field and predict the  
frequency response, impulse  
response, and sound pressure at  
the microphone position  
Figure 4.1. MAPP Online Pro is an intuitive, powerful system design tool  
Residing on the user’s local computer, the Java client  
application facilitates configuring arrays of a wide variety  
of Meyer Sound products and, optionally, defining the  
environment in which they will operate, including air  
temperature, pressure, humidity, and the location and  
composition of walls. In addition CAD (DXF) files can be  
imported directly for accurate venue definition. You can find  
more information as well as apply for MAPP Online Pro at:  
Plan an entire portable or fixed loudspeaker system and  
determine delay settings for fill loudspeakers  
Use virtual Galileo equalization to predetermine the  
correct control settings for best system response  
Gain valuable load information about the array to  
determine rigging capacities, front to back weight  
distribution, as well as center of gravity of the array  
Export images to help generate explanatory  
presentation materials for clients  
11  
 
CHAPTER 4  
The key to MAPP Online Pro’s value is the accuracy of its  
predictions. Performance predictions for each Meyer Sound  
loudspeaker found in MAPP Online Pro are based on a  
model of that product built from 360 1/48th-octave–band  
measurements taken with a SIM audio analyzer in our  
anechoic chamber. The extreme consistency found from  
cabinet to cabinet in Meyer Sound products guarantees that  
the predictions MAPP Online Pro makes from this high-  
resolution data will closely match actual performance.  
Source Independent measurement Technique  
The SIM 3 audio analyzer implements the Meyer Sound  
source independent measurement technique, a dual-  
channel method that accommodates statistically  
unpredictable excitation signals. Any excitation signal  
that encompasses the frequency range of interest (even  
intermittently) may be used to obtain highly accurate  
measurements of acoustical or electronic systems. For  
example, concert halls and loudspeaker systems may be  
characterized during a musical performance using the  
program as the test signal, allowing you to:  
For touring, MAPP Online Pro allows fast and accurate  
planning of system deployment for each venue on the tour,  
including both coverage and rigging information. Sound  
system designers for fixed installations can inform clients  
with understandable graphic illustrations and detailed  
statistics on how a proposed system will perform. The  
designer then arrives at the installation prepared with a  
wealth of information that ensures the system will satisfy  
their requirements “out of the box,” including basic system  
delay and equalization settings. MAPP Online Pro’s  
accurate, high-resolution predictions eliminate unexpected  
coverage problems and minimize onsite adjustments.  
View measurement data as amplitude versus time  
(impulse response) or amplitude and phase versus  
frequency (frequency response)  
Utilize a single-channel spectrum mode  
View frequency domain data with a logarithmic  
frequency axis  
Determine and internally compensate for propagation  
delays using SIM 3 Delay Finder function  
MAPP Online Pro client software is upgraded continually in  
order to add new Meyer Sound products to the database  
and enhance user features. Most upgrades are downloaded  
automatically when logging on to a MAPP Online Pro  
session. The MAPP Online Pro database includes nearly all  
current Meyer Sound products, including all M Series full-  
range and subwoofer cabinets.  
Applications  
The main application of the SIM 3 audio analyzer is  
loudspeaker system testing and alignment. This includes:  
Measuring propagation delay between the subsystems  
to set correct polarities and set very precise delay times  
MAPP Online Pro is compatible with Windows, Linux®,  
Unix®, and MacOS® (10.4 and higher) operating systems.  
Additional system requirements and recommendations are  
listed on the MAPP Online Pro Web page.  
Measuring variations in frequency response caused  
by the acoustical environment and the placement  
and interaction of the loudspeakers to set corrective  
equalization  
Optimizing subwoofer integration  
Optimizing loudspeaker arrays  
The analyzer can also be used in the following applications:  
Microphone calibration and equalization  
Architectural acoustics  
SIm 3 mEASUREmENT SySTEm  
The SIM 3 audio analyzer system includes a selection of  
hardware options, microphones, and accessory cables.  
The SIM audio analyzer system is optimized for making  
audio frequency measurements of an acoustical system with  
a resolution of up to 1/48th of an octave; the high resolution  
enables you to apply precise electronic corrections to adjust  
system response using frequency and phase (time) domain  
information.  
Transducer evaluation and correction  
Echo detection and analysis  
Vibration analysis  
Underwater acoustics  
12  
 
APPENDIX A  
APPENDIx A  
mm-4 Weather Protected Cable Assembly Procedure  
Boot  
Coupling Ring  
Cord Connector  
Cable  
Cable Clamp Housing  
Contact Pins  
Step 1:  
Feed the end of the cable through the boot, cable clamp housing,  
and coupling ring in the order and position shown.  
Cord Connector  
Dot (pin 1  
Cable  
Solder  
3/8" Max.  
7/32"  
indicator)  
2+  
1-  
1-  
2+  
9/32"  
Contact Pins  
Step 2:  
Strip cable as shown and solder conductors to pins.  
NOTE: Pin 1 is negative (-) and pin 2 is positive (+)  
Cord Connector  
Tab  
Cord Connector  
Tab  
Coupling Ring  
Side notch  
Step 3:  
Align coupling ring tabs with cord connector's side notches and push  
the coupling ring onto cord connector.  
Clamp  
Clamp  
Lock  
Step 4:  
Push the cable clamp housing foward until it locks into the connector body  
and snap the two clamps into their compartments.  
Step 5:  
Push the boot all the way foward to seat tightly onto the cable clamp housing.  
NOTE: The EN3 cable mount connector accepts conductors up to  
16 AWG (1.5 mm2) and an outside jacket diameter of 0.265 inches  
(6.73 mm).  
13  
 
APPENDIX B  
APPENDIx b  
mm-4 Specifications  
Acoustical (mm-4CEU required)  
Note: 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  
Operating frequency range  
120 Hz - 18 kHz  
Note: Recommended maximum operating frequency range. Response depends on loading conditions and  
room acoustics.  
Frequency response  
160 Hz - 16 kHz 4 dB  
Note: Free field, measured with one-third octave frequency resolution at 4 meters.  
Phase response  
700 Hz - 17 kHz 45°  
Maximum peak SPL  
112.5 dB  
Note: Measured with pink noise at 1 meter.  
Maximum continouos SPL  
100 dB  
Note: Measured at 1 meter, driven continuously for two hours with pink noise signal having a 12.5 dB peak-  
average ratio.  
Horizontal coverage  
Vertical coverage  
Transducer  
80° (3 kHz - 14 kHz 10°); 120° (below 2 kHz)  
80° (3 kHz - 14 kHz 10°); 120° (below 2 kHz)  
One 4" cone driver; Nominal impedance: 16 Ω; Voice coil size: 0.75"; Power-handling capability: 100 W (AES)  
Note: 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.  
Physical  
Dimensions  
4.00" H x 4.00" W x 4.20" D excluding connector (102 mm x 102 mm x 107 mm)  
2.93"  
(75 mm)  
4.40"  
(112 mm)  
4.00"  
(102 mm)  
2.00" (51 mm)  
4.00"  
4.20"  
(102 mm)  
(107 mm)  
Weight  
3 lbs 14 oz (1.76 kg)  
Extruded aluminum  
Enclosure  
Finish  
Black anodized; custom color available  
Perforated metal screen  
Protective grille  
mm-4 Rear Panels  
Weather-protected version: EN3 Connector  
Indoor version: Phoenix-Style Connector  
14  
 
APPENDIX C  
APPENDIx C  
mm-4CEU Specifications  
Audio Input  
Type  
Differential, electronically balanced; RF and transient protected  
15 V DC, clamped to earth for voltage transient protection  
Two female XLR, one for each input channel  
Max common mode range  
Connector(s)  
Input Impedance  
Wiring  
10 kΩ differential between pins 2 and 3  
Pin 1: Chassis/earth through 11 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  
CMRR  
None  
>60 dB, typically 80 dB (50 Hz - 1 kHz)  
Common mode 850 kHz; differential mode 370 kHz  
Maximum input voltage 25 V peak-peak (+21 dBu sine wave)  
RF Filter  
Input Level  
Audio Output  
Type  
Active push-pull, electronically balanced, capable of driving 600 Ω Load; RF & transient protected  
Maximum 50 V peak-peak (+27 dBu sine wave)  
Out voltage  
Connectors  
Output impedance  
Wiring  
Two male XLR, one for each output channel  
200 Ω differential between pins 2 and 3  
Pin 1: Chassis/earth; Pin 2: Signal +; Pin 3: Signal -  
Audio Performance  
Hum and noise  
Dynamic range  
THD  
<-90 dBV (A-weighted)  
>115 dB  
< 0.01%, typically <.002%  
<0.25 dB (20-20 kHz)  
Response accuracy  
AC Power  
Connector  
IEC 320  
Voltage selection  
UL/CE rated voltage  
Current draw  
Physical  
Switch selectable on rear panel  
90 - 130 V AC; 180 - 260 V AC; 50/60 Hz  
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 Front panel: (2) Rotary  
input attenuators, one per channel; (2) Recessed low cut filter switches, one per channel; (1) AC power  
latching push switch  
Controls  
Rear Panel: (1) AC voltage selector, recessed; (1) T250V fuse and holder  
MultiSense, (4) dual banana, two per channel  
SpeakerSense connectors  
Note: When using multiple sense lines, all lines must be in same electrical polarity.  
Weight  
Finish  
19.00" W x 1.75" H x 7.75" D standard rack mount (482 mm x 44 mm x 197 mm)  
Black, powder coated  
mm-4CEU front & Rear Panels  
A
B
6
6
5
5
Peak Limit  
RMS Limit  
8
8
4
4
Lo Cut  
10  
10  
3
3
2
1
2
1
In  
-15V  
20 h  
20 h  
Power  
Sense  
0
0
B
MM-4 Controller  
A
Out  
B
A
Attn dB  
+
+
+
+
-
-
200-  
250  
100-  
125  
-
-
V Range  
T160mA 250V  
100-125 V50-60 Hz  
200-250 V  
Output  
Input  
A
A
B
B
Amp 1  
Amp 2  
Amp 1  
Amp 2  
B Sense  
A Sense  
15  
 
APPENDIX D  
APPENDIx D  
mm-4 EN3 fire Alarm Signaling Specifications  
Acoustical (fire Alarm Amplifier Required)  
Frequency response  
Fire alarm; 400 Hz to 4 kHz  
Note: Stated per the UL 1480 reporting method.  
UL1480 sound pressure level 89 dB at 10 FT  
10 kΩ differential between pins 2 and 3  
Note: Measured per UL1480.  
Maximum continouos SPL  
ULC S541 sound pressure level 104 dB at 3m  
Note: Measured per ULC S541.  
CAUTION: Do not use the Fire Signaling MM-4 in air handling spaces.  
!
DIRECTIONAL ChARACTERISTIC Per S541 -07 Sec. 7.5  
Horizontal Axis  
SPEAKER  
3m  
180°  
0°  
20°  
40°  
160°  
140°  
-6  
-6  
90°  
-3  
-3  
Rated  
Vertical Axis  
SPEAKER  
3m  
180°  
0°  
30°  
50°  
160°  
140°  
-6  
90°  
-6  
-3  
-3  
Rated  
16  
 
 
Meyer Sound Laboratories Inc.  
2832 San Pablo Avenue  
Berkeley, CA 94702  
T: +1 510 486.1166  
F: +1 510 486.8356  
© 2010  
Meyer Sound Laboratories Inc.  
05.091.012.01 Rev. F  
 

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