Meyer Sound Portable Speaker USM P Series User Manual

USM-P Series  
Self-Powered Loudspeaker Systems  
OPERATING INSTRUCTIONS  
USM-1P  
USM-100P  
Superior  
engineering  
for the art  
and science  
of sound.  
Keep these important operating instructions.  
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!
SAFETY SUMMARY  
endroit où il y a de l’eau ou une  
humidité excessive.  
ENGLISH  
• Um ein Überhitzen dem Lautsprecher  
zu verhindern, das Gerät vor direkter  
Sonneneinstrahlung fernhalten und  
nicht in der Nähe von wärmeab-  
strahlenden Haushaltsgeräten (z.B.  
Heizgerät oder Herd) aufstellen.  
• Im Inneren diesem Lautsprecher herr-  
schen potentiell gefährliche  
• 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.  
• 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.  
• Do not install the loudspeaker in wet  
or humid locations without using  
weather protection equipment from  
Meyer Sound.  
• Ne pas laisser de l’eau ou tout objet  
pénétrer dans l’haut-parleur. Ne pas  
placer de r´cipients contenant un liq-  
uide 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’ap-  
pareils dégageant de la chaleur tels  
que radiateurs ou appareils de  
chauffage.  
Spannungen. Nicht versuchen, das  
Gerät zu öffnen. Es enthält keine vom  
Benutzer reparierbaren Teile.  
Reparaturen dürfen nur von ausge-  
bildetem Kundenienstpersonal  
• Ce haut-parleur contient des circuits  
haute tension présentant un danger.  
Ne jamais essayer de le démonter. Il  
durchgeführt werden.  
ESPAÑOL  
n’y a aucun composant qui puisse être • Para reducir el riesgo de descarga  
• Do not allow water or any foreign  
object to get inside the loudspeaker.  
Do not put objects containing liquid  
on, or near, the unit.  
• To reduce the risk of overheating the  
loudspeaker, avoid exposing it to  
réparé par l’utilisateur. Toutes les  
réparations doivent être effectuées  
par du personnel qualifié et agréé par  
le constructeur.  
eléctrica, desconecte de la red el  
altoparlante antes de instalar el cable  
de señalización de interfaz de la seg-  
nale. Vuelva a conectar el conductor  
flexible de alimentación solamente  
una vez efectuadas todas las inter-  
conexiones de señalizatción.  
DEUTSCH  
direct sunlight. Do not install the unit • Um die Gefahr eines elektrischen  
near heat-emitting appliances, such  
as a room heater or stove.  
Schlages auf ein Minimum zu  
reduzieren, den Lautsprecher vom  
Stromnetz trennen, bevor ggf. ein  
Audio-Schnittstellensignalkabel  
angeschlossen wird. Das Netzkabel  
erst nach Herstellung aller  
• Conecte el altoparlante a un tomacor-  
riente 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 eléctri-  
cos 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.  
• Para reducir el riesgo de sobrecalen-  
tamiento, 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.  
• 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.  
Signalverbindungen wieder einsteck-  
en.  
• 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  
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 con-  
nections.  
• 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 élec-  
triques.  
Luftfeuchtigkeit in Berührung kom-  
men 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.  
• Ne pas installer l’haut-parleur dans un  
3
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USM-P: INTRODUCTION AND TECHNICAL ADVANTAGES  
Thank you for investing in the Meyer  
Sound USM-P Series. The USM-100P and  
USM-1P self-powered stage monitors are  
composed of:  
horn's wider pattern (100°H x 40°V)  
perceive this as a decrease to  
half the SPL. When reading a  
beamwidth specification, it is  
essential to determine whether it  
refers to the -6 or -10dB points  
because they indicate very differ-  
ent results: the -10dB points  
yield a wider angle.  
provides broad coverage in either wedge  
or flown applications.  
DESIGN BENEFITS:  
• one 15-inch cone driver and one 3-  
inch diaphragm compression driver;  
• phase-corrected, optimized control  
electronics;  
• a two-channel amplifier  
(350Wrms/ch).  
• The amplifier is optimized for the sys-  
tem, providing substantial power  
without endangering the drivers.  
• The integrated design simplifies setup  
and installation, eliminates amp  
racks, and extends the durability and  
reliability of the loudspeaker.  
• The gain structure between the con-  
trol electronics and amplifier is per-  
fectly matched.  
Previous technologies produced horns  
whose beamwidth varied over the oper-  
ating frequency range. These horns also  
displayed nonuniform frequency  
response within, and significant side  
lobe energy outside their beamwidth.  
Both undesirable characteristics, partic-  
ularly prevalent for horns with a wide  
beamwidth, make array design extremely  
problemactic.  
Compared to conventional monitor  
designs, Meyer Sound’s USM-P Series  
loudspeakers are uniquely capable of  
producing flat phase and amplitude  
response, full bandwidth reproduction  
and a near-perfect impulse response.  
The USM-P boasts a maximum output of  
132dB peak SPL at 1 meter with excep-  
tionally low distortion and a noteable  
lack of coloration at all amplitude lev-  
els. An additional benefit of the design  
engineering and system packaging of  
the USM-P is its improved linearity and  
lower susceptibility to feedback.  
THE USM-P HORNS: CONSTANT-Q  
Constant research and development  
efforts at Meyer Sound have led to the  
solution of the most difficult problems  
associated with horn design. In order to  
appreciate the significance of this work,  
it is necessary to define an often misun-  
derstood term: the beamwidth of a horn  
is the angle at which the sound pressure  
at a given frequency decreases to half  
(-6dB) its on-axis amplitude. Specifying  
beamwidth using the -6dB points has  
been proposed as the audio industry  
standard; Meyer Sound adheres to this  
definition.  
The USM-P was developed in Meyer  
Sound's anechoic chamber by measuring  
coverage patterns using angular and fre-  
quency resolutions of 1° and 1/36  
octave, respectively. The USM-P horns  
exhibit Constant Q: the beamwidth  
remains consistent across the horn's  
operating frequency range in both the  
vertical and horizontal planes.  
USM-P Series systems excel in stage  
monitoring applications that require  
efficient response down to 30Hz for  
clean, high level reproduction of bass  
and drums. USM-P Series monitors can  
be deployed as stage wedges or flown as  
side-fill.  
Both horns share the following remark-  
able attributes:  
• uniform frequency response within  
the beamwidth  
• rapid and uniform amplitude attenua-  
tion for all frequencies outside the  
beamwidth  
NOTE: Unfortunately, beamwidth is often  
used to describe the angle at  
which the sound pressure  
The USM-1P horn's narrow beamwidth  
(45°H x 45°V) permits precise coverage  
with minimal interaction between  
neighboring monitors. The USM-100P  
decreases 10dB from its on-axis  
amplitude because many listeners • minimal side lobes  
AC POWER  
The USM-P uses a PowerCon locking 3-  
pole AC mains connector that prevents  
inadvertent disconnection. The unit  
must have the correct power cord for  
When AC power is applied to the USM-P,  
an Intelligent ACtm supply automatically  
selects the correct operating voltage,  
allowing the USM-P to be used interna-  
• filters EMI (radio frequencies and  
noise present on the AC line)  
• sustains operation during low-voltage  
periods, which minimizes audio dis-  
continuity  
• provides soft-start power-up, which  
eliminates high inrush current  
the AC power in the area in which it will tionally without manually setting volt-  
be used.  
age switches. The Intelligent AC supply  
performs the following protective func-  
tions to compensate for hostile condi-  
tions on the AC mains:  
Engagement  
Separation  
1
The USM-P can withstand continuous  
voltages up to 264V and allows any  
combination of voltage to GND (i.e.  
Neutral-Hot-GND, Hot-Hot-GND).  
2
2
1
• suppresses high voltage transients up  
to several kilovolts  
3
4
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Continuous voltages higher than amount at 115V; the inrush current at  
an additional 30% above the minimum  
amperage to prevent peak voltage drops  
at the service entry and nuisance trip-  
ping.  
100V is 115% of the 115V amount.  
264V may damage the unit.  
!
The USM-P presents a dynamic load to  
the AC mains which causes the amount  
of current to fluctuate between quiet  
and loud operating levels. Since differ-  
ent types of cables and circuit breakers  
heat up and trip at varying rates, it is  
essential to understand the types of cur-  
rent ratings and how they correspond to  
circuit breaker and cable specifications.  
VOLTAGE REQUIREMENTS  
The USM-P operates safely and without  
audio discontinuity if the AC voltage  
stays within the range 88-264V, 47-  
63Hz. After applying AC power, the sys-  
tem is muted while the circuitry charges  
up and stabilizes. After two seconds,  
the On/Temp. LED on the user panel  
illuminates green, the system unmutes  
and is ready to pass audio signals. If  
the On/Temp. LED does not illuminate  
or the system does not respond to audio  
input after ten seconds, consult the  
Troubleshooting section.  
POWER CONNECTOR WIRING  
Use the following AC cable wiring dia-  
gram to create international or special-  
purpose power connectors:  
brown = hot  
blue =  
neutral  
yellow/green =  
earth ground  
(chassis)  
The maximum continuous RMS current  
is the maximum RMS current over a  
duration of at least 10 seconds. It is  
used to calculate the temperature  
increase in cables, which is used to  
select cables that conform to electrical  
code standards. It is also used to select  
the rating for slow-reacting thermal  
breakers.  
AC cable color code  
If the colors referred to in the diagram  
don't correspond to the terminals in  
your plug, use the following guidelines:  
The USM-P's power supply uses stored  
energy to continue functioning for  
about 10 AC cycles if the voltage  
• Connect the blue wire to the terminal  
marked with an N or colored black.  
decreases below 88V (a condition known  
as brownout). The precise length of time  
the unit functions during brownout  
depends on the operating level and how  
low the voltage drops. The unit turns off  
if the voltage does not increase above  
88V before the storage circuits are  
depleted. If the USM-P shuts down due  
to brownout, the power supply automat-  
ically turns on after three seconds if the  
voltage returns to the normal operating  
range. If the USM-P does not turn back  
on after ten seconds, consult the  
The maximum burst RMS current is the • Connect the brown wire to the termi-  
nal marked with an L or colored red.  
• Connect the green and yellow wire to  
the terminal marked with an E (or )  
or colored green (or green and yel-  
low).  
maximum RMS current over a one sec-  
ond duration. It is used to select the  
rating for most magnetic breakers.  
The maximum instantaneous peak cur-  
rent during burst is used to select the  
rating for fast-reacting magnetic break-  
ers and to calculate the peak voltage  
drop in long AC cables according to the  
formula below.  
SAFETY ISSUES  
Do not use a ground-lifting  
adapter or cut the AC cable  
ground pin.  
Vpkdrop = Ipk x Rtotal cable  
Troubleshooting section.  
Keep all liquids away from the USM-P to  
avoid hazards from electrical shock.  
NOTE: We recommend that the supply be  
operated at least a few volts  
Use the table below as a guide to select  
cables and circuit breakers with appro-  
priate ratings for your operating  
voltage.  
Do not operate the unit with worn or  
frayed cables; replace them immediately.  
away from the upper and lower  
bounds of the operating range to  
avoid possible shutdown.  
To determine the minimum total service  
If the USM-P will be installed outdoors  
contact Meyer Sound for information  
about the rain hood and weather protec-  
tion for the drivers and electronics.  
CURRENT REQUIREMENTS  
115V 230V 100V  
Each USM-P requires approximately  
3Arms @115V (1.5Arms@230V) for  
proper operation. This allows up to five  
USM-Ps to be powered from one 15A  
breaker.  
Idle RMS  
Max. Continuous RMS 2.8A  
Max. Burst RMS 3.2A 1.6A  
Max Peak During Burst 5.0A 2.5A  
.25A  
.13A . 3A  
1.4A  
3.2A  
3.7A  
5.8A  
While a single USM-P can be  
hung by its handle bars and  
!
fitted L-Track strips, do not  
hang any additional weight  
from the cabinet. USM-P han-  
dle bars or the L-Track strips  
mounted on the top front  
panel are not designed to  
support heavy rigging loads.  
The maximum burst current of the  
USM-P is equal to its maximum turn on  
current. For example, a loud drumbeat  
which draws 3A can be easily handled by  
a 20A breaker powering five USM-1Ps.  
power required by a system of USM-P, or  
other Meyer self-powered speakers, add  
their maximum continuous RMS cur-  
The inrush current at 230V is 50% of the rents together. We recommend allowing  
5
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THE MODULAR REAR PANEL  
The rear panel of the USM-P has two  
slots for processor modules. The top slot loop, creating an unbuffered hardwired  
contains the Audio Input and Control  
Module; the bottom slot contains the  
optional Remote Monitoring System™  
(RMS) Module. A blank plate covers the  
bottom slot if RMS is not installed. For  
multiple USM-Ps with a paralleled input  
in a positive pressure wave when a posi-  
tive signal is applied to pin 2. With the  
switch down (-), pin 3 is hot relative to  
pin 2, resulting in a negative pressure  
loop connection, with negligible loss in  
signal level. For example, since the  
input impedance of one USM-P is 10k, wave when a positive signal is applied  
looping 20 USM-Ps produces a balanced  
input impedance of 500. With a 150Ω  
to pin 2. The level attenuator knob  
operates between 0 dB (no level attenu-  
ation) in a fully clockwise position to -  
12 dB in a fully counter-clockwise posi-  
tion.  
drawings of these modules, see page 11. audio source, the 500load results in  
only a 2.28dB loss.  
AUDIO INPUT  
LOOPING AUDIO INPUT MODULE  
There are three, interchangeable Audio  
Input and Control Modules with opti-  
mized connectors and controls for dif-  
ferent applications. Each module has a  
24V Fan connector to power an optional  
fan (see page 11).  
This standard module uses a balanced,  
female XLR connector for audio input  
and a male XLR loop connector to inter-  
connect multiple speakers. The audio  
input connector is hardwired with pin 2  
hot to comply with audio industry stan-  
dards. The loop connector, wired in par-  
allel to the audio input, transmits the  
input signal if the USM-P is turned off  
for any reason.  
REMOTE MONITORING SYSTEM  
The USM-P can be equipped to operate  
with the Remote Monitoring System  
(RMS) network and software application.  
RMS displays signal and power levels,  
driver and cooling fan status, limiter  
activity, the state of the polarity switch,  
attenuator level, and amplifier tempera-  
ture for all speakers in the network on a  
Windows-based PC. RMS is an excellent  
field-diagnostic tool that removes the  
guesswork from troubleshooting during  
a performance. All Meyer RMS-compati-  
ble speakers use the same RMS module  
(depicted on page 11) so they can be  
Each module uses a three-pin, female  
XLR audio input connector with a 10kΩ  
balanced input impedance wired with  
the following convention:  
Pin 1 -220 kto chassis and earth  
ground (ESD clamped)  
LOOPING, POLARITY, AND ATTENUATING  
AUDIO INPUT MODULE  
Pin 2 -Signal  
Pin 3 -Signal  
Case  
-Earth (AC) ground and  
chassis  
This module has a balanced, female XLR  
audio input connector, a male XLR loop  
Pins 2 and 3 carry the input as a differ-  
ential signal. Use standard audio cables  
with XLR connectors for balanced signal  
sources. A single audio source can drive  
connector, an input polarity switch, and easily exchanged between speakers .  
a level attenuator knob. With the input  
polarity switch in the up (+) position,  
pin 2 is hot relative to pin 3, resulting  
Installing an RMS module requires only  
a Phillips screwdriver. Contact Meyer  
Sound for more information about RMS.  
AMPLIFICATION, LIMITING, AND COOLING SYSTEM  
AMPLIFICATION AND LIMITING  
panel (the high limit is above the low  
limit LED).  
While the USM-P limiters fully protect  
the system under overload conditions  
and exhibits smooth sonic characteris-  
tics, we recommend that you do not  
intentionally drive the USM-P into con-  
tinuous limiting to attain compression  
effects.  
Each driver in the USM-P is powered by  
one channel of a proprietary Meyer  
The USM-P performs within its acoustical  
specifications and operates at a normal  
temperature if the limit LEDs are on for  
no longer than two seconds, and off for  
at least one second. If either LED  
remains on for longer than three sec-  
onds, that channel incurs these negative  
consequences:  
Sound amplifier utilizing complementary  
power MOSFET output stages (class AB,  
bridged, 350Wrms/ch). Each channel has  
a limiter that prevents driver over-excur-  
sion and regulates the temperature of  
the voice coil. The limiters protect the  
drivers without the glaring compression  
effects imposed by typical limiters,  
For applications where large amounts of  
compression are required, we recommend  
using an outboard compressor/limiter  
for greater control of limit and compres-  
sor effects.  
allowing high SPLs across each driver's  
entire frequency range. Limiter activity  
for the high and low channels is indicat-  
ed by two yellow Limit LEDs on the rear  
• Increasing the input level will not  
increase the volume.  
• The system distorts due to clipping  
and nonlinear driver operation.  
6
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es to 75°C (167°F), the On/Temp. LED  
changes from red to green and the lim-  
iter threshold returns to normal.  
fan, powered by the 24V Fan user panel  
connector, blows air directly onto the  
heatsink. The fan speed increases as the  
heatsink temperature rises, which main-  
tains a safe operating temperature with  
minimal fan noise. Contact Meyer Sound  
to order the fan kit.  
AMPLIFIER NATURAL CONVECTION  
COOLING SYSTEM  
The USM-P employs a natural convection  
cooling system that depends on air flow  
from below the cabinet over the  
The heatsink gets too hot to  
touch during normal opera-  
tion. Use extreme caution  
heatsink. Allow for proper ventillation  
of fresh air when using the speaker.  
!
near the rear of the cabinet.  
POWER SUPPLY FAN  
If the temperature of the heatsink  
The power supply is cooled by a single small  
internal fan that turns on low when the unit  
is first powered up. The fan doubles its speed  
as the system is driven with audio. Since the  
fan draws air in from, and exhausts it out the  
side of the cabinet, there must be at least six  
inches on the amplifier's side of the cabinet  
and adequate air flow.  
FAN ASSEMBLY KIT  
reaches 85°C (185°F), the On/Temp.  
LED on the rear panel turns from green  
(On) to red (Temp.) and the limiter  
threshold is lowered to a safe level to  
prevent the amplifiers from overheating.  
Under high temperature conditions the  
limiter threshold is reduced to 6 dB.  
When the heatsink tmeperature decreas-  
While convection cooling is adequate  
for most applications, driving the USM-  
P into frequent limiting under severe  
temperature conditions, or where venti-  
lation is restricted, an optional fan kit  
is available to maintain a safe operat-  
ing temperature. The easy-to-install  
COVERAGE  
The Constant Q design of the horn allows The USM-1P's coverage area is:  
frequencies outside of the coverage area  
of the speaker to attenuate quickly. This  
is excellent for monitoring where several  
different monitors are used in close  
proximity. When placing the monitor  
carefully consider the coverage pattern  
of the USM-P and USM-100P.  
-6 dB points: 45° H x 45° V  
-10 dB points: 65° H x 65° V  
The USM-100P's coverage area is:  
-6 dB points: 100° H x 40° V  
-10 dB points: 120° H x 60° V  
The following drawings illustrate the coverage area of each horn from three different  
perspectives in order to depict the three dimensional coverage pattern.  
USM-100P (Top View)  
USM-1P (Front View)  
USM-1P (Side View)  
USM-1P (Top View)  
USM-1P (Top View)  
USM-100P (Side View)  
7
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VERIFYING POLARITY  
Incorrect driver polarity impairs system  
performance and may damage the dri-  
vers. All Meyer Sound loudspeakers are  
shipped with the drivers in correct  
alignment.  
4. Apply the same signal to the second  
speaker with the first speaker still  
connected.  
DRIVER POLARITY IN THE SAME USM-P  
Use the following test procedure to veri-  
fy polarity between drivers in the same  
loudspeaker:  
The polarity is correct if the frequency  
response remains constant with a 5-6dB  
SPL increase in amplitude. Broadband  
cancellation (decreased overall level)  
indicates polarity reversal.  
1. Place a monitoring microphone 1  
meter from the front of the loud-  
speaker at the midway point between  
the high and low frequency drivers.  
2. Connect a full range signal to the  
loudspeaker and note the frequency  
response.  
If the driver or circuit wiring has been  
removed or disassembled it is essential  
to check the polarity between adjacent  
monitors and between drivers and  
between adjacent loudspeakers.  
Since polarity reversal causes  
excessive driver excursion at  
high source levels, use mod-  
erate levels when conducting  
these tests.  
!
POLARITY IN ADJACENT LOUDSPEAKERS  
Use the following test procedure to veri-  
fy the polarity between two adjacent  
loudspeakers of the same type:  
The polarity is correct if the frequency  
response is smooth through the  
crossover region (800Hz to 1.5kHz).  
Cancellation of 6dB or more in this  
region indicates polarity reversal.  
1. Position two loudspeakers adjacent to  
each other.  
USM-P  
Reference  
2. Place a measurement microphone 3ft.  
from the speakers and 3 to 4 feet  
above the USM-1Ps, on the axis  
between the speakers.  
3. Connect a signal source to one speak-  
er and note the frequency response  
and overall level.  
3 Feet  
USM-P  
Under Test  
TROUBLESHOOTING  
This section suggests several possible  
solutions to some common problems  
encountered by USM-P users and is not  
intended to be a thorough troubleshoot-  
ing guide.  
correct type for the regional voltage  
and that it is securely connected to  
the AC inlet then unplug and recon-  
nect the AC cable.  
5. If possible, monitor the audio source  
with headphones.  
HUM OR NOISE IS PRODUCED BY THE  
SPEAKER.  
1. Disconnect the audio input. If the  
hum ceases, the noise originates  
somwhere earlier in the signal path.  
If the noise persists, the problem is  
within the USM-P.  
2. Make sure the XLR cable is securely  
fastened to the XLR audio input con-  
nector.  
3. Send the audio signal to another  
speaker to insure signal presence and  
that the level is within the proper  
range. Turn the source level down  
before reconnecting the audio input  
and increase the level slowly to avoid  
a sudden blast of sound.  
2. Use an AC voltmeter to verify that  
the AC voltage is within the ranges  
88-264V, 47-63 Hz.  
Qualified electronics technicians with  
access to a test bench can request the  
following documents from Meyer Sound:  
Troubleshooting Guide, The Low  
Frequency Driver Replacement  
Procedure, and The High Frequency  
Driver Replacement Procedure for the  
USM-1P/100P.  
THE ON/TEMP. LED IS ILLUMINATED  
BUT THERE IS NO SOUND.  
1. Verify that the audio source (mixer,  
EQ, delay) is sending a valid signal.  
2. Make sure the XLR cable is securely  
fastened to the XLR audio input con-  
nector.  
3. Verify that the XLR cable is function-  
ing by substituting another cable or  
by using the cable in question in a  
working system.  
4. Send the audio signal to another  
speaker to insure signal presence and  
that the level is within the proper  
range. Turn the source level down  
before reconnecting the audio input  
and increase the level slowly to avoid  
a sudden blast of sound.  
If your difficulty persists, or if you sus-  
pect the problem lies solely within the  
USM-P, please contact Meyer Sound  
Technical Support or return the unit to  
the factory or nearest authorized service  
center.  
5. Hum or noise can be produced by a  
ground loop. Since the USM-P is  
effectively ground-lifted, this should  
not occur unless grounds are extreme-  
ly different voltages.  
THE ON/TEMP. LED DOES NOT ILLUMI-  
NATE, THERE IS NO AUDIO, AND THE  
POWER SUPPLY FAN IS OFF.  
1. Make sure the AC power cable is the  
8
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with high-quality headphones.  
2. Send the audio signal to another  
speaker to insure that the signal is  
full-range. Turn the source level down  
before reconnecting the audio input  
and increase the level slowly to avoid and Cooling System on page 6 for a  
a sudden blast of sound.  
3. Use a sine wave and/or pink noise  
generator to send a variety of fre-  
quencies to the speaker.  
than 30°C and this condition occurs  
frequently, contact Meyer Sound to  
order the optional Fan Kit.  
THE AUDIO PRODUCED BY THE SPEAKER  
IS DISTORTED OR COMPRESSED BUT THE  
LIMIT LIGHT IS NOT ILLUMINATED.  
1. Make sure the XLR cable is securely  
fastened to the XLR audio input con-  
nector.  
2. Send the audio signal to another  
speaker to insure that the level is  
within the proper range. Turn the  
source level down before reconnect-  
ing the audio input and increase the  
level slowly to avoid a sudden blast  
of sound.  
See the section Amplification, Limiting,  
complete discussion about the cooling  
system.  
THERE IS NO SOUND, THE ON/TEMP.  
LED IS DIM OR OFF, AND THE POWER  
SUPPLY FAN IS ON HIGH SPEED.  
This extremely rare event occurs when  
the power supply overheats, causing a  
1-2 minute interruption in operation.  
The unit turns on again when the power  
supply has cooled sufficiently.  
THERE IS SOME SOUND BUT THE  
ON/TEMP. LED TURNS FROM GREEN TO  
RED.  
This occurs when the heatsink tempera-  
ture reaches 85°C (185°F), indicating  
that the amplifier is thermally over-  
loaded. The limiter threshold has  
dropped to a safe level, so the audio  
level is probably reduced.  
3. Monitor the audio source with head-  
phones.  
THE AUDIO PRODUCED BY THE SPEAKER  
IS HIGHLY COMPRESSED AND THE LIMIT  
LIGHT IS CONSTANTLY YELLOW.  
1. Turn down the level of the input sig-  
nal to the speaker system.  
1. Make sure there is at least six inches  
clearance behind the unit.  
2. Make sure there is sufficient air flow  
around the unit.  
3. Avoid exposing the unit to direct  
sunlight in high ambient temperature.  
1. Make sure there is enough clearance  
above, below, and behind the unit.  
2. Make sure there is sufficient air flow  
around the unit.  
ONLY THE HIGH OR LOW DRIVER SEEMS  
TO PRODUCE SOUND.  
1. Make sure the audio signal is full-  
range and has not been filtered in a  
previous stage of the signal chain. If  
possible, monitor the audio source  
3. Avoid exposing the heatsink to direct See the section Amplification, Limiting,  
sunlight if the ambient temperature  
and Cooling System on page 6 for a  
more information about the power sup-  
ply's internal fan and cooling system.  
is high.  
4. If the ambient temperature is greater  
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USM-1P/100-P SPECIFICATIONS  
Operating Frequency Range2 30 Hz - 20 kHz  
Acoustical1  
(each loudspeaker)  
Free Field 44 Hz - 16 kHz 3 dB; -6 dB at 40 Hz and 20 kHz  
Half-Space3 40 Hz - 16 kHz 3 dB; -6 dB at 33 Hz and 20 kHz  
Phase Response4  
35° 500 Hz - 16 kHz; +90° at 120 Hz  
Maximum Peak SPL5 132 dB  
Signal to Noise Ratio >95 dB (A-weighted noise floor to max SPL)  
USM-100P -6 db at 100° H x 40° V; -10 dB at 120° H x 60° V  
USM-1P -6 db at 45° H x 45° V; -10 dB at 60° H x 60° V  
Coverage  
Crossover  
USM-100P 900 Hz  
USM-1P 1000 Hz  
Low Frequency 15-inch cone driver  
Transducers  
High Frequency 3-inch diaphragm compression driver  
Type Differential balanced input circuit  
Connector Female XLR; Male XLR Loop  
Standard Audio  
Input Module  
Impedance 10 kdifferential (between pins 2 and 3)  
XLR Wiring Pin 1: chassis; Pin 2: + signal; Pin 3: - signal  
RF Filter Common Mode: 425 kHz low-pass;  
Differential Mode: 142 kHz low-pass  
Common Mode Rejection Ratio >80 dB (50 Hz - 1 kHz); typically 90 dB  
Type Complementary power MOSFET output stages, class AB/bridged  
Output Power 350 Wrms/channel  
THD, IM, TIM < .02 %  
Amplifiers  
AC Power  
Connector PowerCon locking AC connector  
Automatic voltage selection 88 - 264 VAC continuous; 47 - 63 Hz  
Idle RMS Current 115 V: 0.25 Arms  
Max Continuous RMS Current (>10 s) 115 V: 2.8 Arms  
Max Burst RMS Current (<1 s) 115 V: 3.2 Arms  
Max Peak Current During Burst 115 V: 5.0 Apk  
230 V: 0.13 Arms  
230 V: 1.4 Arms  
230 V: 1.6 Arms  
230 V: 2.5 Apk  
100 V: 0.3 Arms  
100 V: 3.2 Arms  
100 V: 3.7 Arms  
100 V: 5.8 Apk  
Soft Start Turn-on Inrush current <15 A @115 V  
Dimensions Height: 16.9(429mm) ; Width: 16.5(419mm); Length: 22.4”  
Physical  
(569mm); Depth (w/grill) 15.19(386mm)  
Weight 88 lbs (40 kg)  
5
Enclosure/Finish  
/ birch plywood/black textured  
8
Protective Grill Removable perforated steel grill, charcoal grey foam  
1
Notes  
1. Measurements are taken at 3 m on-axis, /3 octave, unless otherwise stated.  
2. Response depends on loading conditions and room acoustics.  
3. Measured at 1.5 m with the USM-1P/100-P on a single boundary.  
4. Phase variation from pure delay.  
5. Measured at 1 m, with pink noise or music.  
Meyer Sound reserves the right to alter any specification with-  
for up-to-date information.  
© 2000 Meyer Sound  
Laboratories, Inc.  
All rights reserved  
10  
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USER PANEL AND OPTIONAL MODULES  
The user panel and optional module are described on page 6 of this document.  
User Panel with RMS option and Polarity and Attenuaing Audio Input Module  
Looping, Polarity, and Attenuaing Input Module  
11  
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PHYSICAL DIMENSIONS  
All units in inches.  
USM-1P  
USM-100P  
CONTACT INFORMATION  
Meyer Sound Laboratories, Inc.  
2832 San Pablo Avenue  
Berkeley, CA 94702  
tel: 510.486.1166  
fax: 510.486.8356  
05.089.004.01 Rev A  
12  
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