BRIDGEABLE POWER AMPLIFIER
AMPLIFICADOR DE POTENCIA EN
Manual del Propietario
4-1, MEGURO 1-CHOME, MEGURO-KU, TOKYO 153-8654, JAPAN
PIONEER ELECTRONICS (USA) INC.
P.O. Box 1760, Long Beach, California 90801, U.S.A.
TEL: (800) 421-1404
PIONEER ELECTRONIC (EUROPE) N.V.
Haven 1087 Keetberglaan 1, 9120 Melsele, Belgium
TEL: (0) 3/570.05.11
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 0P2, Canada
Published by Pioneer Corporation.
TEL: (905) 479-4411
Copyright © 1999 by Pioneer Corporation.
PIONEER ELECTRONICS DE MEXICO, S.A. de C.V.
All rights reserved.
San Lorenzo Num 1009 3er piso Desp. 302
Publicado por Pioneer Corporation.
Col. Del Valle, Mexico D.F. C.P. 03100
Copyright © 1999 Pioneer Corporation.
Todos los derechos reservados.
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-X942 and
Otherwise you may get an electric shock. Also, do
GM-X742. 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
Cut Off Frequency Control
If the sound level is too low, even when
If the LPF/HPF select switch is set to
the volume of the car stereo used along
LPF (or HPF), you can select a cut off
with this power amplifier is turned up,
frequency from 40 to 120 Hz.
turn gain control on the front of the
power amplifier clockwise. If the sound
distorts 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.
Bass Boost Level Control
Bass boost level control can boost the
level around the frequency selected by
the bass boost frequency control from 0
to 18 dB.
Bass Boost Frequency Control
You can select a bass boost frequency
from 40 to 120 Hz with the bass boost
• Bass Boost Level Control and Bass Boost
Frequency Control can be adjusted only
when the LPF/HPF select switch is set to a
position other than HPF.
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
* — 40 to 120 Hz
Connect a subwoofer.
* 40 to 120 Hz —
Use if you want to cut the
very low frequency range*
because it is not necessary
for the speakers you are
* See the "Cut Off Frequency Control" section.