Pioneer GM-X942 User Manual

Thank you for purchasing this PIONEER
product. Before attempting operation, be
sure to read this manual.

This manual applies to the GM-X942 and
GM-X742. However, the illustrations show
the GM-X942.

When 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
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.

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
TEL: (905) 479-4411

PIONEER ELECTRONICS DE MEXICO, S.A. de C.V.
San Lorenzo Num 1009 3er piso Desp. 302
Col. Del Valle, Mexico D.F. C.P. 03100
TEL: 5-688-52-90

Published by Pioneer Corporation. 
Copyright © 1999 by Pioneer Corporation. 
All rights reserved.

Publicado por Pioneer Corporation. 
Copyright © 1999 Pioneer Corporation. 
Todos los derechos reservados.

Printed in U.S.A.
Impreso en los EE.UU.

<HRD0125-A> ES

<99L00F0R01>

If the sound level is too low, even when
the volume of the car stereo used along
with this power amplifier is turned up,
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.

If the LPF/HPF select switch is set to
LPF (or HPF), you can select a cut off
frequency from 40 to 120 Hz.

The power indicator lights when the
power is switched on.

Bass boost level control can boost the
level around the frequency selected by
the bass boost frequency control from 0
to 18 dB.

You can select a bass boost frequency
from 40 to 120 Hz with the bass boost
control.

• 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.

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.

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 (left)

* — 40 to 120 Hz

Subwoofer

Connect a subwoofer.

OFF (center)

Full range

Full range

HPF (right)

* 40 to 120 Hz —

Full range

Use if you want to cut the 
very low frequency range*
because it is not necessary 
for the speakers you are 
using.

* See the “Cut Off Frequency Control” section.