Meyer Sound USM-P Series Manuel utilisateur

Marque: Meyer Sound

Modèle: USM-P Series

Catégorie: Haut-parleurs de la barre de son

Taper: Manuel utilisateur

Keep these important operating instructions.

USM-P Series Self-Powered Loudspeaker Systems

OPERATING INSTRUCTIONS

USM-1P

USM-100P

Superior

engineering

for the art

and science

of sound.

Protective earth ground

Terre de protection

Die schutzerde

Tierra proteccionista

Frame or chassis

Masse, châssis

Rahmen oder chassis

Armadura o chassis

Important operating

instructions

Pour indequer important instruc-

tions

Zu wichtige betriebs-

anweisung und unter-

haltsanweisung zeigen

Para indicar importante

funcionar y mantenimiento

instrucciones

Dangerous voltages:

risk of electric shock

Pour indiquer les risques résultant

de tensions dangereuses

Zu die gefahren von

gefährliche spanning zeigen

Para indicar azares provengo

de peligroso voltajes

CONTENTS

DECLARATION OF CONFORMITY ACCORDING TO ISO/IEC GUIDE AND EN 45014

The Manufacturer:

EYER SOUND

LABORATORIES, INC.

2832 San Pablo Avenue

Berkeley, California 94702-2204, USA

Declares that the product:

USM-1P, USM-100P

Conforms to the following Product Specifications

Safety: EN60065: 1994

EMC: EN55103-1 emmission

EN55103-2 immunity

0° to + 45°

<-40°C or > +75°C

to 95% at 35°C

to 4600 m (15,000 ft)

to 6300 m (25,000 ft)

30g 11 msec half-sine on each

of 6 sides

10Hz to 55Hz (0.010m

peak-to-peak excursion)

Office of Quality Manager

Berkeley, California USA May 18, 2000

Operating Temperature

Nonoperating Temperature

Humidity

Operating Altitude

Nonoperating Altitude

Shock

Vibration

NVIRONMENTAL SPECIFICATIONS FOR MEYER SOUND ELECTRONICS PRODUCTS:

Safety Summary 3

Introduction and Technical Advantages 4

AC Power 4

The Modular Rear Panel 6

Amplification, Limiting, and Cooling System 6

Coverage 7

Verifying Driver Polarity 8

Troubleshooting 8

Specifications 10

Rear Panel and Input Modules Drawings 11

Dimensions and Contact Information 12

This device complies with the requirements of the Low

Voltage Directive 73 / 23 / EEC and the EMC Directive 89 /

336 / EEC.

This device also complies with EN 55103-1 & -2. Operation is

subject to the following two conditions:

(1) this device may not cause harmful interference, and

(2) this device must accept any interference received, includ-

ing interference that may cause undesired operation.

European Office:

Meyer Sound Lab. GmbH

Carl Zeiss Strasse 13

56751 Polch, Germany

Made by Meyer Sound Laboratories

Berkeley, California USA

THESE SYMBOLS INDICATE IMPORTANT SAFETY OR OPERATING FEATURES IN THIS BOOKLET AND ON THE CHASSIS

SYMBOLS USED

N757 USM-1P

N757 USM-100P

NGLISH

• 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.

• 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

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 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.

• Ne pas installer l’haut-parleur dans un

endroit où il y a de l’eau ou une

humidité excessive.

• 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.

• 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

réparé par l’utilisateur. Toutes les

réparations doivent être effectuées

par du personnel qualifié et agréé par

le constructeur.

EUTSCH

• Um die Gefahr eines elektrischen

Schlages auf ein Minimum zu

reduzieren, den Lautsprecher vom

Stromnetz trennen, bevor ggf. ein

Audio-Schnittstellensignalkabel

angeschlossen wird. Das Netzkabel

erst nach Herstellung aller

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

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.

• 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

Spannungen. Nicht versuchen, das

Gerät zu öffnen. Es enthält keine vom

Benutzer reparierbaren Teile.

Reparaturen dürfen nur von ausge-

bildetem Kundenienstpersonal

durchgeführt werden.

SPAÑOL

• Para reducir el riesgo de descarga

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.

• 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.

SAFETY SUMMARY

Thank you for investing in the Meyer

Sound USM-P Series. The USM-100P and

USM-1P self-powered stage monitors are

composed of:

• one 15-inch cone driver and one 3-

inch diaphragm compression driver;

• phase-corrected, optimized control

electronics;

• a two-channel amplifier

(350Wrms/ch).

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.

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.

The USM-1P horn's narrow beamwidth

(45°H x 45°V) permits precise coverage

with minimal interaction between

neighboring monitors. The USM-100P

horn's wider pattern (100°H x 40°V)

provides broad coverage in either wedge

or flown applications.

DESIGN BENEFITS:

• 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.

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.

NOTE: Unfortunately, beamwidth is often

used to describe the angle at

which the sound pressure

decreases 10dB from its on-axis

amplitude because many listeners

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.

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.

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.

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

• minimal side lobes

USM-P: INTRODUCTION AND TECHNICAL ADVANTAGES

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

the AC power in the area in which it will

be used.

When AC power is applied to the USM-P,

an Intelligent AC

supply automatically

selects the correct operating voltage,

allowing the USM-P to be used interna-

tionally without manually setting volt-

age switches. The Intelligent AC supply

performs the following protective func-

tions to compensate for hostile condi-

tions on the AC mains:

• suppresses high voltage transients up

to several kilovolts

• 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 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).

Engagement

Separation

Continuous voltages higher than

264V may damage the unit.

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.

The USM-P's power supply uses stored

energy to continue functioning for

about 10 AC cycles if the voltage

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

Troubleshooting section.

NOTE: We recommend that the supply be

operated at least a few volts

away from the upper and lower

bounds of the operating range to

avoid possible shutdown.

CURRENT REQUIREMENTS

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.

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.

The inrush current at 230V is 50% of the

amount at 115V; the inrush current at

100V is 115% of the 115V amount.

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.

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.

The maximum burst RMS current is the

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.

Vpkdrop = Ipk x Rtotal cable

Use the table below as a guide to select

cables and circuit breakers with appro-

priate ratings for your operating

voltage.

To determine the minimum total service

power required by a system of USM-P, or

other Meyer self-powered speakers, add

their maximum continuous RMS cur-

rents together. We recommend allowing

an additional 30% above the minimum

amperage to prevent peak voltage drops

at the service entry and nuisance trip-

ping.

POWER CONNECTOR WIRING

Use the following AC cable wiring dia-

gram to create international or special-

purpose power connectors:

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:

• Connect the blue wire to the terminal

marked with an N or colored black.

• 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).

SAFETY ISSUES

Do not use a ground-lifting

adapter or cut the AC cable

ground pin.

Keep all liquids away from the USM-P to

avoid hazards from electrical shock.

Do not operate the unit with worn or

frayed cables; replace them immediately.

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.

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.

V511V032V001

SMReldIA52.A.13 A3.

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brown = hot

blue =

neutral

yellow/green =

earth ground

(chassis)

The rear panel of the USM-P has two

slots for processor modules. The top slot

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

drawings of these modules, see page 11.

UDIO INPUT

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).

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 kΩ to chassis and earth

ground (ESD clamped)

Pin 2 -Signal

Pin 3 -Signal

Case -Earth (AC) ground and

chassis

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

multiple USM-Ps with a paralleled input

loop, creating an unbuffered hardwired

loop connection, with negligible loss in

signal level. For example, since the

input impedance of one USM-P is 10kΩ,

looping 20 USM-Ps produces a balanced

input impedance of 500Ω. With a 150Ω

audio source, the 500Ω load results in

only a 2.28dB loss.

OOPING AUDIO INPUT MODULE

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.

LOOPING, POLARITY, AND ATTENUATING

AUDIO INPUT MODULE

This module has a balanced, female XLR

audio input connector, a male XLR loop

connector, an input polarity switch, and

a level attenuator knob. With the input

polarity switch in the up (+) position,

pin 2 is hot relative to pin 3, resulting

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

wave when a positive signal is applied

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.

EMOTE 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

easily exchanged between speakers .

Installing an RMS module requires only

a Phillips screwdriver. Contact Meyer

Sound for more information about RMS.

THE MODULAR REAR PANEL

AMPLIFICATION,LIMITING,AND COOLING SYSTEM

MPLIFICATION AND LIMITING

Each driver in the USM-P is powered by

one channel of a proprietary Meyer

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,

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

panel (the high limit is above the low

limit LED).

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:

• Increasing the input level will not

increase the volume.

• The system distorts due to clipping

and nonlinear driver operation.

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.

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.

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

heatsink. Allow for proper ventillation

of fresh air when using the speaker.

If the temperature of the heatsink

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-

es to 75°C (167°F), the On/Temp. LED

changes from red to green and the lim-

iter threshold returns to normal.

The heatsink gets too hot to

touch during normal opera-

tion. Use extreme caution

near the rear of the cabinet.

FAN A

SSEMBLY KIT

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

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.

OWER SUPPLY FAN

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.

USM-1P (Side View)

COVERAGE

The Constant Q design of the horn allows

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.

The USM-1P's coverage area is:

-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

USM-1P (Top View)

USM-1P (Front View)

USM-100P (Side View)

USM-100P (Top View)

USM-1P (Top View)

The following drawings illustrate the coverage area of each horn from three different

perspectives in order to depict the three dimensional coverage pattern.

Incorrect driver polarity impairs system

performance and may damage the dri-

vers. All Meyer Sound loudspeakers are

shipped with the drivers in correct

alignment.

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.

POLARITY IN

ADJACENT LOUDSPEAKERS

Use the following test procedure to veri-

fy the polarity between two adjacent

loudspeakers of the same type:

1. Position two loudspeakers adjacent to

each other.

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.

4. Apply the same signal to the second

speaker with the first speaker still

connected.

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.

Since polarity reversal causes

excessive driver excursion at

high source levels, use mod-

erate levels when conducting

these tests.

DRIVER POLARITY IN THE SAME USM-P

Use the following test procedure to veri-

fy polarity between drivers in the same

loudspeaker:

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.

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.

USM-P

Reference

USM-P

Under Test

3 Feet

VERIFYING POLARITY

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.

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.

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.

HE 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

correct type for the regional voltage

and that it is securely connected to

the AC inlet then unplug and recon-

nect the AC cable.

2. Use an AC voltmeter to verify that

the AC voltage is within the ranges

88-264V, 47-63 Hz.

HE 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.

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.

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 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.

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.

NLY 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

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

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.

THERE IS SOME SOUND BUT THE

/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.

1. Make sure there is enough clearance

above, below, and behind the unit.

2. Make sure there is sufficient air flow

around the unit.

3. Avoid exposing the heatsink to direct

sunlight if the ambient temperature

is high.

4. If the ambient temperature is greater

than 30°C and this condition occurs

frequently, contact Meyer Sound to

order the optional Fan Kit.

See the section Amplification, Limiting,

and Cooling System on page 6 for a

complete discussion about the cooling

system.

THERE IS NO SOUND

, THE ON/T

EMP.

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.

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.

See the section Amplification, Limiting,

and Cooling System on page 6 for a

more information about the power sup-

ply's internal fan and cooling system.

USM-1P/100-P SPECIFICATIONS

Meyer Sound reserves the right to alter any specification with-

out notice. Please visit our web site at www.meyersound.com

for up-to-date information.

Laboratories, Inc.

Acoustical

(each loudspeaker)

Coverage

Crossover

Transducers

Standard Audio

Input Module

Amplifiers

AC Power

Physical

Notes

Operating Frequency Range

Free Field

Half-Space

Phase Response

Maximum Peak SPL

Signal to Noise Ratio

USM-100P

USM-1P

USM-100P

USM-1P

Low Frequency

High Frequency

Type

Connector

Impedance

XLR Wiring

RF Filter

Common Mode Rejection Ratio

Type

Output Power

THD, IM, TIM

Connector

Automatic voltage selection

Idle RMS Current

Max Continuous RMS Current (>10 s)

Max Burst RMS Current (<1 s)

Max Peak Current During Burst

Soft Start Turn-on

Dimensions

Weight

Enclosure/Finish

Protective Grill

30 Hz - 20 kHz

44 Hz - 16 kHz ±3 dB; -6 dB at 40 Hz and 20 kHz

40 Hz - 16 kHz ±3 dB; -6 dB at 33 Hz and 20 kHz

±35° 500 Hz - 16 kHz; +90° at 120 Hz

132 dB

>95 dB (A-weighted noise floor to max SPL)

-6 db at 100° H x 40° V; -10 dB at 120° H x 60° V

-6 db at 45° H x 45° V; -10 dB at 60° H x 60° V

900 Hz

1000 Hz

15-inch cone driver

3-inch diaphragm compression driver

Differential balanced input circuit

Female XLR; Male XLR Loop

10 k

Ω differential (between pins 2 and 3)

Pin 1: chassis; Pin 2: + signal; Pin 3: - signal

Common Mode: 425 kHz low-pass;

Differential Mode: 142 kHz low-pass

>80 dB (50 Hz - 1 kHz); typically 90 dB

Complementary power MOSFET output stages, class AB/bridged

350 Wrms/channel

< .02 %

PowerCon locking AC connector

88 - 264 VAC continuous; 47 - 63 Hz

115 V: 0.25 Arms 230 V: 0.13 Arms 100 V: 0.3 Arms

115 V: 2.8 Arms 230 V: 1.4 Arms 100 V: 3.2 Arms

115 V: 3.2 Arms 230 V: 1.6 Arms 100 V: 3.7 Arms

115 V: 5.0 Apk 230 V: 2.5 Apk 100 V: 5.8 Apk

Inrush current <15 A @115 V

Height: 16.9” (429mm) ; Width: 16.5” (419mm); Length: 22.4”

(569mm); Depth (w/grill) 15.19” (386mm)

88 lbs (40 kg)

” birch plywood/black textured

Removable perforated steel grill, charcoal grey foam

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.

The user panel and optional module are described on page 6 of this document.

USER PANEL AND OPTIONAL MODULES

User Panel with RMS option and Polarity and Attenuaing Audio Input Module

Looping, Polarity, and Attenuaing Input Module

Meyer Sound Laboratories, Inc.

2832 San Pablo Avenue

Berkeley, CA 94702

tel: 510.486.1166

fax: 510.486.8356

e-mail: techsupport@meyersound.com

http: www.meyersound.com

CONTACT INFORMATION

All units in inches.

PHYSICAL DIMENSIONS

05.089.004.01 Rev A

USM-100P

USM-1P

Meyer Sound USM-P Series Manuel utilisateur

Marque: Meyer Sound

Modèle: USM-P Series

Catégorie: Haut-parleurs de la barre de son

Taper: Manuel utilisateur

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Meyer Sound USM-P Series Manuel utilisateur

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