ECLER MPA 4-150 User Manual
USER MANUAL
C
L
E
R
MANUAL DE INSTRUCCIONES
NOTICE D’EMPLOI
BEDIENUNGSANLEITUNG
MPA4-150
AUDIO CREATIVE POWER
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MPA4-150 USER MANUAL
1. IMPORTANT REMARK 04
2. INTRODUCTION 04
3. INSTALLATION 05
3.1. Placement and mounting 05
3.2. Mains connection 05
3.3. Ground Link switch 06
3.4. Multi-function 06
3.5. Input connections 07
3.6. Output connections 07
4. OPERATION AND USAGE 08
4.1. Start up 08
4.2. Input attenuation 08
4.3. Indicators 08
5. CLEANING 08
6. DIAGRAMS 27
6.1. Technical characteristics 27
6.2. Input options 28
6.3. Output options 29
6.4. Function list 30
6.5. Function diagram 32
6.6. Block diagram 33
All numbers subject to variation due to production tolerances. ECLER S.A. reserves the right to make
changes or improvements in manufacturing or design which may affect specifications.
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1. IMPORTANT REMARK
Congratulations! You are the owner of a carefully designed and manufactured
equipment. We thank you for having purchased our MPA4-150 power amplifier.
It is VERY IMPORTANT that you read this manual before connecting the amplifier in
order to obtain its maximum performance.
We recommend our authorised Technical Services whenever any maintenance task
should be needed so that optimum operation shall be achieved.
2. INTRODUCTION
This multichannel power amplifier has been designed using the same technology as
the PAM amplification series. With this technology, ECLER introduced a new concept to the
world of professional audio: The use of switching field effect transistors. The SPM-Technology
(Switching Power Mosfet) has been developed and patented by ECLER S.A. The use of these
parts for audio applications represents a firm and spectacular enhancement comparing to
conventional amplifiers.
These advantages can be outlined as follows:
a) Lower internal resistance than bipolar transistors, which leads to less heating of the
amplifier and more powerful and controllable bass.
Conventional Mosfets have a 4 to 7 times bigger internal resistance than switching
Mosfets.
b) The extremely high speed of these devices gives a transparency to the upper
frequencies till now only achieved by tube amplifiers. This fact also reduces TIM (transitory
intermodulation) to very low levels.
The MPA4-150 amplifier station consists of four 147W/4Ω amplifiers which can be
configured through a set of switches found on the rear panel. This allows multiple amplification
setups useful in many situations, for example:
Four mono amplifiers for four different mono inputs
When setup this way, the MPA4-150 is able to amplify four different audio signals, each one
having a dedicated volume control.
Four mono amplifiers for one common mono input
The amplifier operates now with just one input signal for all amplifiers, but preserves the ability to
control each channels volume independently. This setup is useful when distributing signals to
different zones.
Four mono amplifiers for one common stereo input
This setup is similar to the previous example but the input is now a stereo signal. The amplifier
adds both stereo channels together converting them into a mono signal.
Two stereo amplifiers for two different stereo inputs
Each stereo channel offers a dedicated volume control. Useful for addressing two zones with
two different stereo signals.
Two stereo amplifiers for one common stereo input
This setup is similar to the previous example but the input is now a single stereo signal which is
fed to both amplifiers.
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Two bridged amplifiers for two different mono inputs
Now you get a typical stereo amplifier configuration. With a bridged amplifier you obtain
doubled output power with a load of at least 8Ω.
Two bridged amplifiers for a common mono input
The MPA operates now with a single mono signal for two mono amplifiers, each one with its
own volume control
Two bridged amplifiers for two different stereo inputs
You can obtain two zones with independent volume control and two different stereo signals,
but these stereo signals are internally converted to mono in each bridged amplifier
Two bridged amplifiers for a common stereo input
This setup is similar to the previous example but the input is now a stereo signal. The amplifier
adds both stereo channels together converting them into a mono signal.
One stereo amplifier and one bridged amplifier for a common stereo input.
Useful for setups where a stereo amplifier drives the mid-range and high frequency speakers
while a second, bridged amplifier drives a subwoofer. This multichannel amplifier features a
low-pass filter to operate on a subwoofer system and a high-pass filter for the mid-range
speakers and tweeters.
3. INSTALLATION
3.1. Placement and mounting
The amplifier is presented as a 2 unit high 19'' rack module. It is supplied with plastic
washers in order not to damage the unit when tightening the screws.
It is important that the amplifier, as a heat source, is not placed next to other equipment nor
exposed to high temperatures.
3.2. Mains connection
The amplifier operates on alternate currents, depending on the country 110-120,
220-240V 50/60 Hz (see characteristics in the back of the unit). The power consumption at
maximum performance is 750VA. It's important that your mains installation is adequately
scaled to these power demands.
You should provide the device with a suitable earth connection, Rg= 30Ω or less
The environment should be dry and completely dust-free
When connecting / disconnecting cables or doing other manipulation always pull out
the mains supply cable
You should avoid that the supply cable twists with the shielded signal cables, as this
could lead to unwanted hum.
In order to protect the unit from an eventual electrical overload or momentary power
peaks from the internal circuits it carries a T 8A fuse (25). Should it ever blow up,
unplug the unit from mains and replace it with an identical one. If the new fuse blows
again contact immediately with our Authorized Technical Service. YOU MUST NEVER USE A
HIGHER VALUE FUSE.
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3.3. Ground Link switch
The “GND LINK” switch (26) purpose is to avoid ground loops caused when several
devices in the same amplification chain are connected to earth simultaneously. This switch
disconnects the electrical ground from the mechanical ground on the housing. In case of a
ground loop (humming noise) operate this switch or alternatively the corresponding switches on
the other devices connected to the chain.
3.4. Multi-function
Depending on the input switches on the MPA4-150 (27, 29, 30, 31, 33, 34), located
on the rear panel, four different amplification configurations can be achieved:
- Four mono amplifiers with following possibilities:
Four different mono inputs.
One common mono input for all.
One common stereo input for all.
- Two stereo amplifiers with following possibilities:
Two different stereo inputs.
One single stereo input for both.
- Two bridged amplifiers with following possibilities:
Two different mono inputs.
One common mono input.
Two different stereo input.
One common stereo input.
Combinations between mono, stereo and bridged amplifiers
On the rear panel you can also activate the high-pass and low-pass filters:
High-pass filter ON/OFF switch (28). The cut-off frequency lies at 160 Hz for
amplifiers 3 and 4 simultaneously or when operating in bridged mode. This filter cuts out all
frequency components under 160 Hz and passes the rest, being specially suited for connecting
the mid-range and high frequency speakers.
Low-pass filter ON/OFF switch (32). This switch activates a filter at channel 1 which
cuts out the frequency components above 160 Hz and passes the lower ones.
ATTENTION: Due to the fact that subwoofers require a considerable amount of
electrical power, channel 1 and 2 must be configured in bridged mode. If they are set to
stereo-mode, the system will not work properly, as the filter only affects the output of
channel 1.
Combining one bridged amplifier with switched on low-pass filter together with a
stereo amplifier with switched on high-pass filter turns your multichannel power amplifier into
an ideal equipment for clubs and other locations with a subwoofer, mid-range speakers and
tweeters.
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3.5. Input connections
The signal input connections (20, 21, 22, 23) are electronically balanced XLR-3
sockets, with an input impedance higher than 20kΩ and a nominal sensitivity of 0dBV(1V).
Pin assignment:
1. GROUND
2. PHASE (in phase with the output)
3. NON PHASE (inverted phase)
The following diagram shows the connection of balanced and non-balanced audio
sources:
Some of the connection options for the and the corresponding switch settings are
described later in paragraph 6.2.
Depending on the chosen option, the SP indicators will only light for the active
channels.
3.6. Output connections
The output section on the MPA4-150 rear panel holds 8 screw-type speaker terminals
(16, 17, 18, 19), two for each amplifier.
The attenuation controls and the output configurations are described later in
paragraph 6.3.
The cable which connects the speakers to the amplifier should be high quality and as
short and thick as possible. This is important when covering long distances; For up to 10m we
recommend a cable section not smaller than 2.5mm². For longer distances we recommend
4mm².
Remember that the minimum load impedance for stereo or mono amplifiers is 4Ω. In
bridged mode the impedance must be not less than 8Ω. For a reliable operation under any
circumstance connect lower load impedances than just specified.
Attention: In bridged mode, use only the red terminals.
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4. OPERATION AND USAGE
4.1. Start up
To switch the unit on just push the switch labelled POWER (14) and the integrated
green pilot-light will light up. We highly recommend the "safe power-up sequence": First the
sound sources, then mixer, equalizers and active filters and, finally, power amplifiers. Powering
off should be done by following the exact reverse sequence in order to avoid any possible
peaks reaching the next device, and consequently protecting the loudspeakers, which are
specially sensitive to these peaks.
4.2. Input attenuation
These are rotary trimmers located on the front panel (1, 4, 7, 10).
These attenuators allow the connection of different mixers, an independent volume
control and the connection of speakers not able to handle the amplifiers maximum output power,
thus avoiding the risk of damaging them with the mixers or preamps volume control.
Inside the device's packaging you will find a little plastic bag containing 4 transparent
caps which protect the input attenuation settings from unwanted manipulation. These caps are
transparent in order to let you visualize the current settings.
Once inserted, they cannot be removed with bare fingers, for this purpose, a small
screwdriver is needed.
4.3. Indicators
The SP signal presence indicators (2, 5, 8, 11) light up when the input signal reaches
approximately -40dBV.
The CLIP indicators (3, 6, 9, 12) light up when the output signal for the speakers is
-1.5dB below the actual clipping threshold. This clipping system watches for eventual supply
voltage variations, thus giving always an accurate clipping indication, regardless of mains
voltage deviations.
It is normal that when operating at high output power, the CLIP indicators light up in
synchronisation with the low frequencies, which carry the most energy. Nevertheless, you
should avoid that the CLIP indicators are lit continuously.
5. CLEANING
The control panel must not be cleaned with any dissolvent, abrasive or petroleum
derivate substance else paint and silk printing could be damaged.
Whenever cleaning should be necessary use a soft cloth slightly wet with water and
neutral liquid soap or with a solution of water and alcohol at 50%. Be careful that no liquid gets
into the mixer. Never use sharp or erosive objects to scratch the control panel.
Should any liquid get into the amplifier, do not use any cleaning sprays; send the unit
to the nearest ECLER Technical Service.
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MANUAL DE INSTRUCCIONES MPA4-150
1. NOTA IMPORTANTE 10
2. INTRODUCCIÓN 10
3. INSTALACIÓN 11
3.1. Ubicación y montaje 11
3.2. Conexión a red 11
3.3. Conmutador “Ground Link” 12
3.4. Multifunción 12
3.5. Conexiones de entrada 13
3.6. Conexiones de salida 13
4. OPERACIÓN Y USO 14
4.1. Puesta en funcionamiento 14
4.2. Atenuadores de entrada 14
4.3. Indicadores 14
5. LIMPIEZA 14
6. DIAGRAMAS 27
6.1. Características técnicas 27
6.2. Opciones de entrada 28
6.3. Opciones de salida 29
6.4. Lista de funciones 30
6.5. Diagrama de funciones 32
6.6. Diagrama de bloques 33
Todos los datos están sujetos a variación debida a tolerancias de producción. ECLER S.A. se reserva el
derecho de realizar cambios o mejoras en la fabricación o diseño que pudieran afectar las especificaciones.
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1. NOTA IMPORTANTE
¡Enhorabuena!. Vd. posee el resultado de un cuidadoso diseño y una esmerada
fabricación. Agradecemos su confianza por haber elegido nuestra etapa de potencia MPA4-150.
Para conseguir la máxima operatividad del aparato y su máximo rendimiento, es MUY
IMPORTANTE antes de su conexión, leer detenidamente y tener muy presentes las
consideraciones que en este manual se especifican.
Para garantizar el óptimo funcionamiento de este aparato, recomendamos que su
mantenimiento sea llevado a cabo por nuestros Servicios Técnicos autorizados.
2. INTRODUCCIÓN
Esta etapa de potencia multicanal ha sido diseñada con la misma tecnología que nuestra
serie de amplificación PAM. Con esta tecnología, ECLER introdujo un nuevo concepto en el audio
profesional: el empleo de los transistores de efecto de campo de conmutación. La tecnología SPM
(Switching Power Mosfet) fue desarrollada y patentada por ECLER S.A. La incorporación al audio
de estos componentes significa una firme y espectacular mejora con relación a los sistemas
convencionales.
Estas ventajas pueden resumirse así:
a) Resistencia interna más baja que los transistores bipolares lo cual redunda en un
calentamiento inferior de la etapa y en unos graves poderosos y muy bien controlados.
Los mosfets convencionales de audio presentan una resistencia interna de 4 a 7 veces
superior a los de conmutación.
b) La enorme rapidez de estos dispositivos confiere a los agudos una transparencia hasta
ahora sólo lograda con amplificadores a válvulas, al tiempo que una TIM (distorsión por
intermodulación de transitorios) muy reducida.
La estación de amplificación MPA4-150 está formada por cuatro amplificadores de
147W/4Ω configurables mediante los conmutadores situados en el panel posterior, permitiendo
múltiples posibilidades de trabajo de entre las que destacamos:
4 Amplificadores en mono para 4 señales mono diferentes.
De esta forma el MPA está preparado para trabajar con cuatro señales distintas disponiendo
cada una de ellas de su propio control de volumen.
4 Amplificadores en mono con una entrada en común.
El amplificador trabaja solamente con una señal de entrada pero conserva la posibilidad de
ajustar de forma independiente el nivel de cada uno de los cuatro canales, es una aplicación
ideal para realizar una distribución de sonido a distintas zonas.
4 Amplificadores en mono con una entrada en estéreo común.
Aplicación idéntica a la anterior pero teniendo como entrada una fuente de sonido estéreo, el
amplificador realiza la suma de los dos canales de la fuente para convertirla en una señal mono.
2 Amplificadores estéreo con dos entradas estéreo diferentes.
Disponiendo cada una de ellas del control de volumen de cada canal estéreo. Útil para sonorizar
dos zonas con dos señales estéreo diferentes.
2 Amplificadores estéreo con entrada estéreo común.
Aplicación idéntica a la anterior pero con la misma señal estéreo de entrada en los dos
amplificadores.
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2 Amplificadores en puente con dos señales mono diferentes.
Disponemos de un amplificador estéreo convencional. Con un amplificador trabajando en puente
obtendremos el doble de potencia con una impedancia de carga mínima de 8Ω.
2 Amplificadores en puente con una señal mono en común.
El MPA trabaja con una sola señal de entrada para dos amplificadores mono con posibilidad de
controlar los volúmenes de forma independiente.
2 Amplificadores en puente con dos entradas estéreo diferentes.
Tendremos dos zonas con controles de volumen independientes con dos señales estéreo
diferentes, pero estas señales estéreo se convierten en señales mono internamente en cada
amplificador en puente.
2 Amplificadores en puente con un entrada estéreo común.
Aplicación idéntica a la anterior pero teniendo como entrada una fuente de sonido estéreo, el
amplificador realiza la suma de los dos canales de la fuente para convertirla en una señal mono.
1 Amplificador estéreo y 1 amplificador en puente con una entrada estéreo común.
Útil para instalaciones con un amplificador estéreo con cajas de medios y agudos y un segundo
amplificador en puente para una caja de subgraves. Este amplificador multicanal dispone de
filtro paso bajo para instalar cajón de subgraves y de filtros paso alto para las cajas de medios y
agudos.
3. INSTALACIÓN
3.1. Ubicación y montaje
El amplificador se presenta en módulo rack de 19" y dos unidades de altura, se
suministra con arandelas de plástico con el fin de poderlo montar en un rack sin dañar el aparato.
Es muy importante que, como elemento generador de calor que es, el amplificador no
esté completamente encerrado ni expuesto a temperaturas extremas.
3.2. Conexión a red
El amplificador se alimenta con corriente alterna, según el país, de 110-120, 220-240V
50/60Hz. (ver placa de características en el aparato), su consumo a plena potencia es de 750VA,
por ello es importante que la instalación de red sea la adecuada a tal consumo.
Debe conectarse a una toma de tierra en condiciones (Resistencia de tierra, Rg=30Ω o
menos).
El ambiente de trabajo deberá ser seco y estar totalmente libre de polvo.
En caso de requerir alguna intervención y/o conexión - desconexión del amplificador
debe desconectarse previamente la alimentación.
Debe evitarse que el cable de red se entremezcle con los cables blindados que
transportan la señal de audio, ya que ello podría ocasionar zumbidos.
Para proteger al amplificador de eventuales sobrecargas en la línea de red o bien excesos
ocasionales en el consumo de los circuitos internos, está provisto de un fusible de red de
T 8A (25). En caso de que éste se fundiera se desconectaría el aparato y se sustituiría
por otro de idénticas características. Si éste último se volviera a fundir, consulte con nuestro
Servicio Técnico. EN NINGÚN CASO DEBE PONERSE UN FUSIBLE DE VALOR MÁS ELEVADO.
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