AMPLIFICADOR DE POTENCIA DE
CUATRO CANALES EN PUENTE
Manual del Propietario
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
PIONEER ELECTRONICS AUSTRALIA PTY. LTD.
178-184 Boundary Road, Braeside, Victoria 3195, Australia
TEL: (03) 9586-6300
Published by Pioneer Corporation.
PIONEER ELECTRONICS OF CANADA, INC.
Copyright © 2002 by Pioneer Corporation.
300 Allstate Parkway, Markham, Ontario L3R OP2, Canada
All rights reserved.
TEL: (905) 479-4411
Publicado por Pioneer Corporation.
PIONEER ELECTRONICS DE MEXICO, S.A. de C.V.
Copyright © 2002 Pioneer Corporation.
San Lorenzo 1009 3er. Piso Desp. 302
Todos los derechos reservados.
Col. Del Valle Mexico, D.F. C.P. 03100
Printed in U.S.A.
Impreso en los EE.UU.
Before Using This Product
Thank you for purchasing this PIONEER
product. Before attempting operation, be
sure to read this manual.
• Always use the special red battery and ground
wire [RD-223], which is sold separately. Connect
Composition of Manual
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.
This manual applies to the GM-X574 and
Otherwise you may get an electric shock. Also, do
GM-X374. However, the illustrations show
not touch the amplifier when it is wet.
• For traffic safety and to maintain safe driving
conditions, keep the volume low enough so that
In case of trouble
you can still hear normal traffic sound.
• Check the connections of the power supply and
When the unit does not operate properly,
speakers if the fuse of the separately sold battery
contact your dealer or the nearest autho-
wire or the amplifier fuse blows. Detect the cause
rized PIONEER Service Station.
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
• 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.
Setting the Unit
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
• If you only use one input plug, set the gain
controls for speaker outputs A and B to the
• 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
Input Select Switch
For two-channel input, slide this switch
to the left. For four-channel input, slide
this switch to the right.
The power indicator lights when the
power is switched on.
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.
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:
Audio frequency range
to be output
Very Low Frequency range
Connect a subwoofer.
Low Frequency range to
Use if you want to cut the
High Frequency range
very low frequency range
because it is not necessary
for the speakers you are