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Setting the Unit
Gain Control
Adjusting the gain controls A and B will
help match the output of the car stereo to
the Pioneer amplifier. Normally, set the
gain controls to the "NORMAL" posi-
tion. If the output is low, even when the
volume of the car stereo is turned up,
turn these controls clockwise. If there is
distortion when the volume of the car
stereo is turned up, turn these controls
counter-clockwise.
· If you only use one input plug, set the gain
controls for speaker outputs A and B to the
same position.
· When using with an RCA equipped car
stereo (standard output of 500 mV), set to
the NORMAL position. When using with
an RCA equipped Pioneer car stereo with
max. output of 4 V or more, adjust level to
match the car stereo output level.
· If you hear too much noise when using the
speaker input terminals, turn the gain
control counter-clockwise.
Power Indicator
The power indicator lights when the
power is switched on.
LPF (Low-Pass Filter)/HPF (High-Pass Filter) Select Switch
Set the LPF/HPF select switch as follows according to the type of speaker that is connected
to the speaker output connector and the car stereo system:
LPF/HPF Select
Audio frequency range
Speaker
Remarks
Switch
to be output
Type
LPF (Left)
Very Low Frequency range
Subwoofer
Connect a subwoofer.
OFF (Center)
Full range
Full range
HPF (Right)
Low Frequency range to
Full range
Use if you want to cut the
High Frequency range
very low frequency range
because it is not necessary
for the speakers you are
using.
BFC (Beat Frequency Control) Switch
If you hear a beat while listening to an
AM broadcast with your car stereo,
change the BFC switch using a small
standard tip screwdriver.
Thank you for purchasing this PIONEER
product. Before attempting operation, be
sure to read this manual.
Composition of Manual
This manual applies to the GM-X574 and
GM-X374. However, the illustrations show
the GM-X574.
In case of trouble
When the unit does not operate properly,
contact your dealer or the nearest autho-
rized PIONEER Service Station.
WARNING
· Always use the special red battery and ground
wire [RD-223], which is sold separately. Connect
the battery wire directly to the car battery positive
terminal (+) and the ground wire to the car body.
· Do not touch the amplifier with wet hands.
Otherwise you may get an electric shock. Also, do
not touch the amplifier when it is wet.
· For traffic safety and to maintain safe driving
conditions, keep the volume low enough so that
you can still hear normal traffic sound.
· Check the connections of the power supply and
speakers if the fuse of the separately sold battery
wire or the amplifier fuse blows. Detect the cause
and solve the problem, then replace the fuse with
another one of the same size and rating.
· To prevent malfunction of the amplifier and
speakers, the protective circuit will cut the power
supply to the amplifier (sound will stop) when an
abnormal condition occurs. In such a case, switch
the power to the system OFF and check the
connection of the power supply and speakers.
Detect the cause and solve the problem.
· Contact the dealer if you cannot detect the cause.
· To prevent an electric shock or short-circuit
during connection and installation, be sure to
disconnect the negative (­) terminal of the battery
beforehand.
· Confirm that no parts are behind the panel when
drilling a hole for installation of the amplifier. Be
sure to protect all cables and important equipment
such as fuel lines, brake lines and the electrical
wiring from damage.
Before Using This Product
Input Select Switch
For two-channel input, slide this switch
to the left. For four-channel input, slide
this switch to the right.
PIONEER CORPORATION
4-1, MEGURO 1-CHOME, MEGURO-KU, TOKYO 153-8654, JAPAN
PIONEER ELECTRONICS (USA) INC.
P.O. Box 1540, Long Beach, California 90801-1540, U.S.A.
TEL: (800) 421-1404
PIONEER EUROPE NV
Haven 1087, Keetberglaan 1, B-9120 Melsele, Belgium
TEL: (0) 3/570.05.11
PIONEER ELECTRONICS ASIACENTRE PTE. LTD.
253 Alexandra Road, #04-01, Singapore 159936
TEL: 65-6472-1111
PIONEER ELECTRONICS AUSTRALIA PTY. LTD.
178-184 Boundary Road, Braeside, Victoria 3195, Australia
TEL: (03) 9586-6300
PIONEER ELECTRONICS OF CANADA, INC.
300 Allstate Parkway, Markham, Ontario L3R OP2, Canada
TEL: (905) 479-4411
PIONEER ELECTRONICS DE MEXICO, S.A. de C.V.
San Lorenzo 1009 3er. Piso Desp. 302
Col. Del Valle Mexico, D.F. C.P. 03100
TEL: 55-5688-52-90
Published by Pioneer Corporation.
Copyright © 2002 by Pioneer Corporation.
All rights reserved.
Publicado por Pioneer Corporation.
Copyright © 2002 Pioneer Corporation.
Todos los derechos reservados.
Printed in U.S.A.
Impreso en los EE.UU.
<HRD0224-A> ES
<KYMFX/02I00000>
BRIDGEABLE FOUR-CHANNEL
POWER AMPLIFIER
AMPLIFICADOR DE POTENCIA DE
CUATRO CANALES EN PUENTE
Owner's Manual
GM-X574
GM-X374
Manual del Propietario


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Connecting the Unit
CAUTION
· Disconnect the negative (­) terminal of the battery
to avoid the risk of short-circuit and damage to
the unit.
· Secure the wiring with cable clamps or adhesive
tape. To protect the wiring, wrap adhesive tape
around it where they lie against metal parts.
· Do not route wires where they will get hot, for
example where the heater will blow over them. If
the insulation heats up, it may become damaged,
resulting in a short-circuit through the vehicle
body.
· Make sure that wires will not interfere with mov-
ing parts of the vehicle, such as the gearshift,
handbrake or seat sliding mechanism.
· Do not shorten any wires. Otherwise the protec-
tion circuit may fail to work when it should.
· Never feed power to other equipment by cutting
the insulation of the power supply wire to tap
from the wire. The current capacity of the wire
will be exceeded, causing overheating.
GM-X574
Speaker Channel
Speaker Type
Power
Four-channel
Subwoofer
Nominal input: Min. 55 W
Other than subwoofer
Max. input: Min. 100 W
Two-channel
Subwoofer
Nominal input: Min. 135 W
Other than subwoofer
Max. input: Min. 260 W
Three-channel
Subwoofer
Nominal input: Min. 55 W
Speaker output A
Other than subwoofer
Max. input: Min. 100 W
Three-channel
Subwoofer
Nominal input: Min. 135 W
Speaker output B
Other than subwoofer
Max. input: Min. 260 W
To prevent damage
· Do not ground the speaker wire directly or con-
nect a negative (­) lead wire for several speakers.
· This unit is for vehicles with a 12-volt battery and
negative grounding. Before installing it in a recre-
ational vehicle, truck or bus, check the battery
voltage.
· If the car stereo is kept on for a long time while
the engine is at rest or idling, the battery may go
dead. Turn the car stereo off when the engine is at
rest or idling.
· If the system remote control wire of the amplifier
is connected to the power terminal through the
ignition switch (12 V DC), the amplifier will
always be on when the ignition is on-- regardless
of whether the car stereo is on or off. Because of
this, the battery could go dead if the engine is at
rest or idling.
· Speakers to be connected to the amplifier should
conform with the standards listed below. If they
do not conform, they may catch fire, emit smoke
or become damaged. The speaker impedance must
be 2 to 8 ohms. But in case of two-channel and
other bridge connections, the speaker impedance
must be 4 to 8 ohms.
· Install and route the separately sold battery wire
as far away as possible from the speaker wires.
Install and route the separately sold battery wire,
ground wire, speaker wires and the amplifier as
far away as possible from the antenna, antenna
cable and tuner.
· Cords for this product and those for other prod-
ucts may be different colors even if they have the
same function. When connecting this product to
another product, refer to the supplied Installation
manuals of both products and connect cords that
have the same function.
Connection Diagram
Fuse (30 A)
Grommet
RCA input
Special red battery wire [RD-223] (sold separately)
After making all other connections at the amplifier,
connect the battery wire terminal of the amplifier to
the positive (+) terminal of the battery.
Ground wire (black) [RD-223] (sold separately)
Connect to metal body or chassis.
Amplifier with
RCA input jacks
GM-X574: Fuse (25 A)
× 2
GM-X374: Fuse (30 A)
× 1
Car stereo with
RCA output jacks
External Output
If only one input plug is used, do not
connect anything to RCA input jack B.
Connecting wires with RCA pin
plugs (sold separately).
RCA input jack B
RCA output jack
Speaker output terminal
See the "Connecting the
Speaker wires" section
for speaker connection
instructions.
System remote control wire (sold separately)
Connect the male terminal of this wire to the system remote control
terminal of the car stereo (SYSTEM REMOTE CONTROL). The female
terminal can be connected to the auto-antenna relay control terminal. If the
car stereo does not have a system remote control terminal, connect the
male terminal to the power terminal through the ignition switch.
Fuse (30 A)
Front side
Connecting wires with RCA pin
plugs (sold separately).
RCA input jack A
Back side
Speaker input terminal
See the "Using the Speaker Input"
section.
GM-X374
Speaker Channel
Speaker Type
Power
Four-channel
Subwoofer
Nominal input: Min. 40 W
Other than subwoofer
Max. input: Min. 70 W
Two-channel
Subwoofer
Nominal input: Min. 100 W
Other than subwoofer
Max. input: Min. 200 W
Three-channel
Subwoofer
Nominal input: Min. 40 W
Speaker output A
Other than subwoofer
Max. input: Min. 70 W
Three-channel
Subwoofer
Nominal input: Min. 100 W
Speaker output B
Other than subwoofer
Max. input: Min. 200 W


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Connecting the Unit
Connecting the Speaker wires
The speaker output mode can be four-channel, three-channel (stereo +
mono) or two-channel (stereo, mono). Connect the speaker leads to suit the
mode according to the figures shown below.
· When either the RCA input or the speaker input is connected, RCA output
becomes functional. Do not connect both the RCA input and the speaker input at
the same time.
Four-channel mode
Three-channel mode
+
+
+
+
+
+
+
Two-channel mode (stereo)
Two-channel mode (mono)
+
+
+
+
Input Select Switch
For two-channel input, slide this switch to
the left. For four-channel input, slide this
switch to the right.
(Left)
Speaker out A
(Right)
Speaker input
terminal A
Speaker output
terminal
(Right)
Speaker out B
(Left)
Speaker input
terminal B
Speaker input
connector
Input Select Switch
For two-channel input, slide this switch to
the left. For four-channel input, slide this
switch to the right.
(Left)
Speaker out A
(Right)
Speaker input
terminal A
Speaker output
terminal
Speaker out B
(Mono)
Speaker input
terminal B
Speaker input
connector
Speaker (Left)
Speaker (Right)
Input Select Switch
Slide this switch to the left.
Speaker input
terminal A
Speaker output
terminal
Speaker input
connector
Speaker (Mono)
Speaker (Mono)
Input Select Switch
Slide this switch to the left.
Speaker input
terminal A
Speaker output
terminal
Speaker input
connector
Connecting the Power Terminal
· Always use the special red battery and ground
wire [RD-223], which is sold separately. Connect
the battery wire directly to the car battery positive
terminal (+) and the ground wire to the car body.
1. Pass the battery wire from the
engine compartment to the interior
of the vehicle.
· After making all other connections to the
amplifier, connect the battery wire terminal of
the amplifier to the positive (+) terminal of
the battery.
2. Twist the battery wire, ground wire
and system remote control wire.
3. Attach lugs to wire ends. Lugs not
supplied.
· Use pliers, etc., to crimp lugs to wires.
4. Connect the wires to the terminal.
· Fix the wires securely with the terminal
screws.
Connecting the Speaker Output
Terminals
1. Expose the end of the speaker wires
using nippers or a cutter by about
10 mm and twist.
2. Attach lugs to speaker wire ends.
Lugs not supplied.
· Use pliers, etc., to crimp lugs to wires.
10 mm
Fuse (30 A)
Engine
compart-
ment
Interior of
the vehicle
Drill a 14 mm
hole into the
vehicle body.
Insert the O-ring rubber
grommet into the vehicle
body.
Twist
Positive terminal
Fuse (30 A)
Battery wire
Ground wire
Lug
Lug
3. Connect the speaker wires to the
speaker output terminals.
· Connect the speaker wires, passing them
through the terminal cover.
· Fix the speaker wires securely with the termi-
nal screws.
4. Push on the terminal cover.
Using the Speaker Input
Connect the car stereo speaker output
wires to the amplifier using the supplied
speaker input connector.
· Do not connect both the RCA input and the
speaker input at the same time.
7 Connections when using the speaker
input
Speaker
output
terminal
Terminal cover
Terminal screw
Speaker wire
Twist
Speaker wire
Lug
Speaker output
Car Stereo
Speaker input connector
To speaker input terminal of
this unit.
White:
Left +
Gray:
Right +
White/black:
Left
Gray/black:
Right
GND terminal
Power terminal
Battery wire
System remote
control terminal
System remote
control wire
Ground wire


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CAUTION
· Do not install in:
--Places where it could injure the driver or pas-
sengers if the vehicle stops suddenly.
--Places where it may interfere with the driver,
such as on the floor in front of the driver's
seat.
· Make sure that wires are not caught in the sliding
mechanism of the seats, resulting in a short-cir-
cuit.
· Confirm that no parts are behind the panel when
drilling a hole for installation of the amplifier.
Protect all cables and important equipment such
as fuel lines, brake lines and electrical wiring
from damage.
· Install tapping screws in such a way that the screw
tip does not touch any wire. This is important to
prevent wires from being cut by vibration of the
car, which can result in fire.
· To prevent electric shock, do not install the ampli-
fier in places where it might come in contact with
liquids.
· To ensure proper installation, use the supplied
parts in the manner specified. If any parts other
than the supplied ones are used, they may damage
internal parts of the amplifier, or they may
become loose causing the amplifier to shut down.
To prevent malfunction
· To ensure proper heat dissipation of the amplifier,
be sure of the following during installation.
--Allow adequate space above the amplifier for
proper ventilation.
--Do not cover the amplifier with a floor mat or
carpet.
· Do not install the amplifier near a door where it
may get wet.
· Do not install the amplifier on unstable places
such as the spare tire board.
· The best location for installation differs with the
car model and installation location. Secure the
amplifier at a sufficiently rigid location.
· Make temporary connections first and check that
the amplifier and the system operate properly.
· After installing the amplifier, confirm that the
spare tire, jack and tools can be easily removed.
Example of installation on the floor
mat or on the chassis
1. Place the amplifier where it is to be
installed. Insert the supplied tapping
screws (4
× 18 mm) into the screw
holes. Push on the screws with a
screwdriver so they make marks
where the installation holes are to be
located.
2. Drill 2.5 mm diameter holes at the
point marked, and install the ampli-
fier, either on the carpet or directly
to the chassis.
Installation
Drill a 2.5 mm diameter hole
Tapping-screws
(4
× 18 mm)
Floor mat
or chassis
Specifications
GM-X574
Power source .............................................................................................................. 14.4 V DC (10.8 -- 15.1 V allowable)
Grounding system ............................................................................................................................................ Negative type
Current consumption ........................................................................................................ 26.5 A (at continuous power, 4
)
Average current drawn* .......................................................................................................... 9.1 A (4
for four channels)
14.2 A (4
for two channels)
Fuse .......................................................................................................................................................................... 25 A
× 2
Dimensions ........................................................................................................................ 269 (W)
× 50 (H) × 309 (D) mm
Weight ...................................................................................................................... 3.7 kg (Leads for wiring not included)
Maximum power output .................................................................................................................... 100 W
× 4 / 260 W × 2
Continuous power output .......................................................... 50 W
× 4 (at 14.4 V, 4 , 20 -- 20,000 Hz, 0.15% THD)
130 W
× 2 (at 14.4 V, 4 , 20 -- 20,000 Hz, 0.8% THD)
65 W
× 4 (at 14.4 V, 2 , 20 -- 20,000 Hz, 0.8% THD)
Load impedance ............................................................................................................................ 4
(2 -- 8 allowable)
(Bridge connection: 4 -- 8
allowable)
Frequency response ............................................................................................................ 10 -- 45,000 Hz (+0 dB, ­1 dB)
Signal-to-noise ratio .......................................................................................................................... 97 dB (IEC-A network)
Distortion ............................................................................................................................................ 0.008% (10 W, 1 kHz)
Separation ........................................................................................................................................................ 65 dB (1 kHz)
Low pass filter ................................................................................................................................ Cut off frequency: 80 Hz
Cut off slope: ­12 dB/oct
High pass filter ................................................................................................................................ Cut off frequency: 80 Hz
Cut off slope: ­12 dB/oct
Maximum input level/impedance .................................................................................... RCA: 6.5 V/22 k
(0.2 -- 6.5 V)
Speaker: 26 V/40 k
(0.8 -- 26 V)
Note:
· Specifications and the design are subject to possible modification without notice
due to improvements.
*Average current drawn
· The average current drawn is nearly the maximum current drawn by this unit
when an audio signal is input. Use this value when working out total current
drawn by multiple power amplifiers.
GM-X374
Power source .............................................................................................................. 14.4 V DC (10.8 -- 15.1 V allowable)
Grounding system ............................................................................................................................................ Negative type
Current consumption ........................................................................................................ 19.2 A (at continuous power, 4
)
Average current drawn* .......................................................................................................... 6.7 A (4
for four channels)
10.9 A (4
for two channels)
Fuse .................................................................................................................................................................................. 30 A
Dimensions ........................................................................................................................ 265 (W)
× 50 (H) × 237 (D) mm
Weight ...................................................................................................................... 2.8 kg (Leads for wiring not included)
Maximum power output ...................................................................................................................... 70 W
× 4 / 200 W × 2
Continuous power output .......................................................... 35 W
× 4 (at 14.4 V, 4 , 20 -- 20,000 Hz, 0.08% THD)
100 W
× 2 (at 14.4 V, 4 , 20 -- 20,000 Hz, 0.8% THD)
50 W
× 4 (at 14.4 V, 2 , 20 -- 20,000 Hz, 0.8% THD)
Load impedance ............................................................................................................................ 4
(2 -- 8 allowable)
(Bridge connection: 4 -- 8
allowable)
Frequency response ............................................................................................................ 10 -- 45,000 Hz (+0 dB, ­1 dB)
Signal-to-noise ratio ...................................................................................................................... 100 dB (IEC-A network)
Distortion ............................................................................................................................................ 0.008% (10 W, 1 kHz)
Separation ........................................................................................................................................................ 65 dB (1 kHz)
Low pass filter ................................................................................................................................ Cut off frequency: 80 Hz
Cut off slope: ­12 dB/oct
High pass filter ................................................................................................................................ Cut off frequency: 80 Hz
Cut off slope: ­12 dB/oct
Maximum input level/impedance .................................................................................... RCA: 6.5 V/22 k
(0.2 -- 6.5 V)
Speaker: 26 V/40 k
(0.8 -- 26 V)
Note:
· Specifications and the design are subject to possible modification without notice
due to improvements.
*Average current drawn
· The average current drawn is nearly the maximum current drawn by this unit
when an audio signal is input. Use this value when working out total current
drawn by multiple power amplifiers.


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Ajuste de esta unidad
Control de ganancia
El ajuste de los controles de ganancia A
y B le ayuda a igualar la salida del
equipo estéreo para automóvil al amplifi-
cador Pioneer. Normalmente, ajuste los
controles de ganancia a la posición
"NORMAL". Si la potencia de salida
está baja aún cuando se aumenta el volu-
men del equipo estéreo del automóvil,
gire esos controles a la derecha. Si se
produce distorsión cuando se aumenta el
volumen del equipo estéreo de
automóvil, gire los controles a la
izquierda.
· Si se usa solamente un enchufe de entrada,
ajuste los controles de ganancia para las
salidas de altavoz A y B a la misma posi-
ción.
· Cuando se usa un estéreo de automóvil
equipado con RCA (salida estándar de
500 mV), ajuste a la posición NORMAL.
Cuando use con un estéreo de automóvil
Pioneer equipado con RCA con una salida
máxima de 4 V o más, ajuste el nivel para
adecuarse al nivel de salida del estéreo del
automóvil.
· Si se oye ruido excesivo cuando se usan los
terminales de entrada de altavoz, gire el
control de nivel a la izquierda.
Indicador de alimentación
El indicador de alimentación se ilumina
cuando la unidad se encuentra activada.
Interruptor BFC (Control de la
frecuencia de batido)
Si escucha sonidos de batido mientras
está recibiendo una emisora de AM con
su estéreo de automóvil, cambie el
interruptor BFC usando un
destornillador pequeño.
Antes de usar este producto
Muchas gracias por la adquisición de este
producto PIONEER. Antes de tratar de
operarlo, lea atentamente este manual.
Composición de manual
Este manual se aplica a los modelos
GM-X574 y GM-X374. Sin embargo, las
ilustraciones solamente muestran el
GM-X574.
En caso de desperfectos
Si esta unidad no funciona correctamente,
póngase en contacto con su distribuidor o
con el Centro de Servicio PIONEER
autorizado más cercano.
ADVERTENCIA
· Siempre utilice el cable de batería rojo especial y
el cable de tierra [RD-223], vendidos separada-
mente. Conecte el cable de batería directamente al
terminal positivo de la batería del vehículo (+) y
el cable de tierra a la carrocería del vehículo.
· No toque en el amplificador con las manos
mojadas. Caso contrario, usted puede llevar un
choque eléctrico. Igualmente, no toque en el
amplificador cuando esté mojado.
· Para seguridad del tráfico y para mantener condi-
ciones de conducción seguras, mantenga el volu-
men suficientemente bajo de manera que aun se
pueda escuchar el sonido del tráfico normal.
· Verifique las conexiones del suministro de energía
y altavoces para ver si el fusible del cable de
batería vendido separadamente o el fusible del
amplificador se queman. Detecte la causa y solu-
cione el problema, y reemplace el fusible con un
otro del mismo tamaño y régimen.
· Para evitar mal funcionamiento del amplificador y
altavoces, el circuito de protección cortará la ali-
mentación al amplificador (el sonido se detendrá)
cuando se produzca una situación anormal. En tal
caso, apague el sistema y verifique la conexión de
la alimentación y altavoces. Detecte la causa y
resuelva el problema.
· Contacte a su distribuidor si no puede detectar la
causa.
· Para evitar choques eléctricos o cortocircuitors
durante la conexión e instalación, asegúrese de
desconectar el terminal negativo (­) de la batería
antes de proceder.
· Confirme que ninguna parte quede detrás del
panel, cuando perfore un orificio para la insta-
lación del amplificador. Asegúrese de proteger
todos los cables y equipos importantes, tales como
líneas de combustibles, líneas de frenos y el
cableado eléctrico.
Interruptor de selección de
entrada
Para la entrada de dos canales, deslice
este interruptor hacia la izquierda. Para
la entrada de cuatro canales, deslice este
interruptor hacia la derecha.
Interruptor de selección LPF (Filtro de paso bajo)/HPF (Filtro de paso
alto)
Ajuste el interruptor de selección LPF/HPF de la manera siguiente, de acuerdo al tipo de
altavoz que se encuentra conectado al conector de salida de altavoz y al sistema estéreo
de automóvil:
Interruptor de
Gama de frecuencia de
Tipo de
Observaciones
selección LPF/HPF
audio a ser generada
altavoz
LPF (izquierda)
Gama de frecuencia
Altavoz de graves
Conecte a un altavoz
muy baja
secundario
de graves secundario.
OFF (central)
Gama completa
Gama completa
HPF (derecha)
Gama de frecuencia
Gama completa
Utilice si desea cortar
baja a gama de
la gama de frecuencia
frecuencia alta
muy baja debido a que
no es necesaria para el
altavoz que está usando.