Setting the Unit
Gain ControlIf the sound level is too low, even whenthe volume of the car stereo used alongwith this power amplifier is turned up,turn gain control on the front of thepower amplifier clockwise. If the sounddistorts when the volume is turned up,turn the gain control counter-clockwise.
• 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.
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-X972,GM-X572 and GM-X372. However, theillustrations show the GM-X972.
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 ProductPIONEER 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.
BRIDGEABLE POWER AMPLIFIER
AMPLIFICADOR DE POTENCIA EN
Manual del Propietario
LPF (Low-Pass Filter) Select SwitchSet the LPF select switch as follows according to the type of speaker that is connected to thespeaker output connector and the car stereo system:LPF Select Audio frequency range Speaker RemarksSwitch to be output Type
LPF (left) Very Low Frequency range Subwoofer Connect a subwoofer.
OFF (right) Full range Full range
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