MTX Audio WET75-2 User Manual [en, es, fr]

Use your smartphone to scan or visit
youtube.com/user/MTXAudioUSA
to learn how to properly install this
amplifier.

MTX.COM

OWNER’S MANUAL

WET SERIES AMPLIFIERS

PRODUCT INFORMATION

Model #
Serial #
Dealer’s Name
Date of Purchase

INTRODUCTION

Thank you for purchasing this MTX Audio Hi-Performance marine grade amplifier. Proper installation
matched with MTX speakers and subwoofers provide superior sound and performance for endless
hours of enjoyment on your boat wherever the current takes you. Congratulations and enjoy the
ultimate audio experience with MTX!

FEATURES

• Compact Size

• Double Sided PCB

• Surface Mount Components

• MOSFET Design

• LPF and HPF Crossover

• Adjustable Bass Boost

• Noise Free Design

• Short, Thermal, and High/Low Voltage Protection

• Conformal Coated PCB

• Plexiglass Cover for Controls

• Stainless Steel Hardware

• Rubber Gaskets Around RCA Connectors

CONTROL FUNCTIONS

1. Speakers - Connect speakers/subwoofers to these terminals. Be sure to check wire for proper
polarity. Never connect the speaker cables to the chassis ground.

2. +BATT (+12 Volt Power) - Connect this terminal through a FUSE or CIRCUIT BREAKER to the
positive terminal of the vehicle battery or the positive terminal of an isolated audio system
battery. WARNING: Always protect this power cable by installing a fuse or circuit breaker of the
appropriate gauge within 18 inches (45cm) of the battery terminal connection.

3. Remote Turn On - This terminal turns on the amplifier when (+) 12 volt is applied to it. Connect it to
the remote turn on lead of the head unit or signal source.

4. GND - Run an equal gauge wire from the Ground (GND) terminal on the MTX amplifier to the
negative terminal on the battery. Use the shortest distance possible. It is always a good idea to
replace the factory ground at this time with a cable equal or larger than the new amplifier power
cable. CAUTION: Do not connect this terminal directly to the vehicle battery
ground terminal or any other factory ground points.

5. RCA Input Jacks - These RCA input jacks are for use with source units that have RCA outputs. A
source unit with a minimum level of 200mV is required for proper operation. The use of high
quality twisted pair cables is recommended to decrease the possibility of radiated noise entering
the system.

6. Gain Control - The Gain control will match the amplifier’s sensitivity to the source units signal
voltage. The operating range is 5V to 200mV. NOTE: This is NOT a volume control.

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7. Low Pass Filter Control (Mono Block) - This control is used to select the desired low pass x-over
frequency. The frequency can be adjusted from 40Hz to 220Hz for all bass mono models.

8. Subsonic Filter Control (Mono Block) - This control can filter out unwanted low frequency from
20Hz (OFF) to 50Hz. This function should only be used with vented enclosures.

9. Bass Boost Level Switch (Mono Block) - This switch can boost bass level by 0dB, 6dB, or 12dB.
The boost frequency is centered at 50Hz.

10. High Pass Filter (Full Range) - This controls the frequencies played for the front channels. Low
frequencies can be cut off from OFF to 200Hz. At OFF position, no low frequencies cut off,
meaning full range.

11. X-Over Mode and Frequency Control (Full Range) - These controls allow control over the
frequencies played for the rear channels. There is an option for Low Pass, Full Range, or High
Pass. In LP or HP mode, the crossover frequency can be tuned from 50Hz to 750Hz.

12. Power Indicator - This LED will light up when the amplifier is working properly.

13. Protection Indicator - The Red LED will light up and flash if there is a fault presented to the
amplifier. Please disconnect the amplifier and resolve the fault before reconnecting the amplifier.

PANEL LAYOUT

4-Channel Amplifier Panel Layout

6 13

10

6

1 4

3

2

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PANEL LAYOUT

2 Channel Amplifier Panel Layout

6

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PANEL LAYOUT

Mono Block Amplifier Panel Layout

12

13

1

1

2

6 7 895

2

4

3

4

3

WET75.2

WET75.2

WET500.1

WET500.1

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WIRING DIAGRAM

See page 26 for amplifier wiring diagrams.

INSTALLATION AND MOUNTING

MTX recommends your new Thunder Marine WET Series amplifier be installed by a 12 volt
installation specialist. Any deviation from specified installation instructions can cause serious
damage to the amplifier, speakers and/or vehicle’s electrical system. Damage caused from improper
installation is NOT covered under warranty. Please verify all connections prior to system turn on.

1. Disconnect the vehicle’s negative battery cable.

2. Determine the mounting place for your MTX amplifier. Keep in mind there should be sufficient
air flow for proper cooling. Mark the mounting holes from the amplifier to be drilled. Before
drilling make sure all vehicle wires, gas lines, and gas tank are clear and will not
interfere with installation. Drill the desired holes and mount the MTX amplifier.

3. Install a positive (+) power cable from the vehicle’s battery. Run the cable through
the vehicle and connect it to the amplifier’s (+BATT) terminal. Do not connect to the
battery at this time. NOTE: Use only proper gauge wire for both positive and negative connections.

4. Install a circuit breaker or fuse within 18 inches of the battery. This effectively lowers the risk
of severe damage to you or your vehicle in case of a short circuit or accident. Make sure the
circuit breaker is switched Off or the fuse is taken out of the fuse holder untill all connections are
made. Now connect your positive power cable to the positive battery terminal of the battery.

5. Grounding - Run an equal gauge wire from the Ground (GND) terminal on the MTX amplifier to the
battery compartment. Once installation is complete you will attach this cable to the negative
battery terminal on the battery in step 9.

6. Connect a Remote Turn-On wire from the source unit to the MTX amplifier’s (REM) terminal. If the
source unit does not have a dedicated Remote Turn-On lead, you may connect to the source unit’s
Power Antenna lead.

7. Supply the signal to your MTX amplifier by connecting the signal cables using high quality RCA to
the corresponding outputs at the source unit and inputs of the amplifier.

8. Connect your speakers to your MTX amplifier’s speaker terminals using the correct gauge
speaker wire. Your MTX Thunder Marine amp can drive a 2Ω minimum load for optimum power.

9. Double check all previous installation steps, in particular, wiring and component connections.

Once verified, reconnect the vehicle’s negative battery cable, turn the circuit breaker On or place
the fuse in the fuse holder.

NOTE: Gain Levels on the amplifier should be turned all the way down (counter clockwise) before
proceeding with adjustments.

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INSTALLATION

For proper perfomance and safety, MTX recommends installing an inline fuse per the owner’s manual
instructions according to the following.

WET500.1 60A Fuse
WET75.2 30A Fuse
WET75.4 60A Fuse

TROUBLESHOOTING

Problem Cause Solution

No +12V at Remote Connection Supply +12V to Terminal

No LED Indication

Power LED On,
No Output

No +12V at Power Connection Supply +12V to Terminal
Insufficient Ground Connection Verify Ground Connection
Blown Power Fuse Replace Fuse

Volume on Source Unit Off Increase Volume on Source Unit
Speaker Connections Not Made Make Speaker Connections
Gain Control on Amplifier Off Turn Up Gain
Signal Processing Units Off Apply Power to Signal Processor
All Speakers Blown Replace Speakers

Output Distorted

Balance Reversed

Bass is Weak

Blowing Fuses

Head Unit Volume Set Too High Lower Head Unit Volume
Amplifier Gain Set Too High Lower Amplifier Gain

Speaker Wire L & R Reversed Correct Speaker Wire Orientation
RCA Inputs Reversed Reverse RCA Inputs

Speakers Wired Out of Phase Wire Speakers with Correct Phase
Not Using MTX Subwoofers Buy MTX Subwoofers

Excessive Output Levels Lower the Volume
Amplifier Defective Return for Service

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SPECIFICATIONS

Model WET500.1 WET75.2 WET75.4

Description 500 W RMS Mono 2x 75 W RMS 4 x 75 W RMS

RMS Power at 14.4V

1Ω Load NA NA NA
2Ω Load 500 W RMS 2x 100W RMS 4 x 100 W RMS
4Ω Load 300 W RMS 2 x 75 W RMS 4 x 75 W RMS

Features

Input Level 0.2 - 5V 0.2 - 5V 0.2 - 5V
Frequency Response 20Hz - 220Hz 15Hz - 25kHz 15Hz - 25kHz
Low Pass Filter (LPF) 40Hz - 220Hz 50Hz - 750Hz (Rear) 50Hz - 750Hz (Rear)

High Pass Filter (HPF) NA 50Hz - 750Hz (Rear)

Subsonic Filter 20Hz - 50Hz NA NA
THD at 4Ω , 1W <0.3% <0.05% <0.05%
Signal-to-Noise Ratio >75dB >78dB >78dB

Bass Boost

Best Efficiency at 4Ω >80% >60% >60%
Minimum Load 2Ω 2Ω 2Ω
External Bass Control (EBC)

Optional Remote
Low Voltage Protection Yes, Protect <8V Yes, Protect <8V Yes, Protect <8V
Short Circuit Test @ Max Power Pass Pass Pass

Overheat Protect Temperature

Components & PCB

Height 2.25" (56.5mm) 2.25" (56.5mm) 2.25" (56.5mm)
Width 6.31" (160mm) 6.31" (160mm) 6.31" (160mm)
Length 9.02" (229mm) 9.45" (240mm) 12.21" (310mm)

0 - 6dB - 12dB

Switchable

Yes NA NA

Protect at 80°C /

176°F

SMD Parts / Double

Sided FR-4 PCB

Dimensions

NA NA

Protect at 80°C /

176°F

SMD Parts / Double

Sided FR-4 PCB

10Hz - 200Hz (Front)
50Hz - 750Hz (Rear)

Protect at 80°C /

176°F

SMD Parts / Double

Sided FR-4 PCB

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INFORMACIÓN DEL PRODUCTO

Número de modelo
Número de serie
Nombre del distribuidor
Fecha de compra

INTRODUCCIÓN

Gracias por comprar este MTX Audio Hi-Performance amplificador de grado marino ti. La instalación
correcta emparejado con altavoces y subwoofers MTX ofrecen un sonido superior y un rendimiento
de interminables horas de disfrute en la embarcación donde la corriente te lleva. Felicitaciones y
disfrutar de la última experiencia de audio con MTX!

CARACTERÍSTICAS

• Tamaño compacto

• Circuitos impresos por los dos lados

• Componentes de montaje en superficie

• Diseño Mosfet

• Crossover de LPF y HPF

• Refuerzo de bajos ajustable

• Diseño libre de ruidos

• Protección contra cortocircuito, sobrecalentamiento y exceso o deficiencia de voltaje

• Recubrimiento homologado PCB

• Cubierta de plexiglás para controles

• Hardware del acero inoxidable

• Juntas de goma alrededor de conectores RCA

FUNCIONES DE CONTROL

1. Altavoces. Conecte los altavoces o subwoofers a estas terminales. Asegúrese de revisar la

polaridad del cable. Nunca conecte cables de altavoz a la conexión a tierra del chasis.

2. +BATT (Alimentación de 12 V (+)). Conecte esta terminal a través de un FUSIBLE o un

INTERRUPTOR AUTOMÁTICO a la terminal positiva de la batería del vehículo o a la terminal
positiva de una batería de sistema de sonido aislada. ADVERTENCIA: Proteja siempre este cable
de alimentación instalándole un fusible o un interruptor automático del valor nominal apropiado a
menos de 18 plg. (45 cm) de la terminal de la batería.

3. Encendido a distancia. Esta terminal enciende el amplificador cuando se le aplican 12 V (+).

Conéctele el conductor de encendido a distancia de la unidad principal o de la fuente de señales.

4. Conexión a tierra (GND). Conecte esta terminal directamente al chasis de metal del vehículo.

Haga la conexión con el cable más corto posible en un punto en que se haya quitado toda
la pintura hasta llegar al metal desnudo. Siempre es buena idea cambiar el cable de conexión a
tierra en este momento por un cable de igual o mayor calibre que el del cable de alimentación del
amplificador. PRECAUCIÓN: NO conecte esta terminal directamente a la terminal de conexión a
tierra de la batería del vehículo ni a ningún otro punto de conexión a tierra de fábrica.

5. Conectores de entrada RCA. Estos conectores de entrada RCA son para fuentes con salidas RCA.

Se requiere una fuente con un mínimo de 200 mV para el funcionamiento correcto. Se
recomienda usar cable de par trenzado de alta calidad para reducir la posibilidad de que entre
ruido radiado al sistema.

6. Control de amplificación. Ajusta la sensibilidad del amplificador para que corresponda al voltaje

de la señal de la fuente. El intervalo de funcionamiento es de 5 V a 200 mV. NOTA: Este NO es un
control de volumen.

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7. Control de filtro de pasabajas (monobloque). Este control es para seleccionar la frecuencia de

crossover de pasabajas deseada. La frecuencia se puede ajustar de 40 Hz a 220 Hz en todos los
modelos de bajos tipo monobloque.

8. Control de filtro subsónico (monobloque). Este control puede eliminar las frecuencias bajas

no deseadas desde 20 Hz (OFF) hasta 50 Hz. Esta función se debe utilizar solamente en cajas con
ventilación.

9. Selector de refuerzo de bajos (monobloque). Este selector puede reforzar los bajos en 0 dB, 6 dB

o 12 dB. La frecuencia de refuerzo está centrada en 50 Hz.

10. Filtro de pasaaltas (gama completa de frecuencias). Esto controla las frecuencias que se

reproducen por los canales delanteros. Las frecuencias bajas se pueden eliminar desde apagado
(OFF) hasta 200 Hz. En la posición de apagado (OFF) no hay eliminación de frecuencias, lo cual
implica reproducción de gama completa de frecuencias.

11. Control de modalidad de crossover y frecuencias (gama completa). Estos controles permiten

controlar las frecuencias que se reproducen por los canales traseros. Hay opciones de
pasabajas (LP), gama completa de frecuencias o pasaaltas (HP). En modalidad LP o HP, las
frecuencias de crossover se pueden fijar de 50 Hz a 750 Hz.

12. Indicador de alimentación. Este indicador LED está iluminado cuando el amplificador está

funcionando correctamente.

13. Indicador de protección. El indicador LED rojo se enciende y destella si se produce una falla en el

amplificador. Desconecte el amplificador y repare la falla antes de volver a conectarlo.

DISPOSICIÓN DEL PANEL

Disposición del panel del amplificador de cuatro canales

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2

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DISPOSICIÓN DEL PANEL

Disposición del panel del amplificador de dos canales

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DISPOSICIÓN DEL PANEL

Disposición del panel del amplificador de monobloque

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4

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6 7 895

4

3

2

WET75.2

WET75.2

WET500.1

WET500.1

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