Setting the Unit
Gain ControlAdjusting the gain controls A and B willhelp match the output of the car stereo tothe Pioneer amplifier. Normally, set thegain controls to the “NORMAL” posi-tion. If the output is low, even when thevolume of the car stereo is turned up,turn these controls clockwise. If there isdistortion when the volume of the carstereo is turned up, turn these controlscounter-clockwise.
• 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
Power IndicatorThe power indicator lights when thepower is switched on.
LPF (Low-Pass Filter)/HPF (High-Pass Filter) Select SwitchSet the LPF/HPF select switch as follows according to the type of speaker that is connectedto the speaker output connector and the car stereo system:LPF/HPF Select Audio frequency range Speaker RemarksSwitch 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
BFC (Beat Frequency Control) SwitchIf you hear a beat while listening to anAM broadcast with your car stereo,change the BFC switch using a small standard tip screwdriver.Thank you for purchasing this PIONEERproduct. Before attempting operation, besure to read this manual.
Composition of ManualThis manual applies to the GM-X574 andGM-X374. However, the illustrations showthe GM-X574.
In case of troubleWhen the unit does not operate properly,contact your dealer or the nearest autho-rized PIONEER Service Station.
• 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
• 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 SwitchFor two-channel input, slide this switchto the left. For four-channel input, slidethis 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
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
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.
AMPLIFICADOR DE POTENCIA DE
CUATRO CANALES EN PUENTE
Manual del Propietario
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