Thank you for purchasing this PIONEER
product. It is designed to give you many
years of enjoyment.
PIONEER SUGGESTS USING A PRO-
FESSIONAL INSTALLER DUE TO THE
COMPLEXITY OF THIS PRODUCT.
Please read all instructions and WARN-
INGS in this manual before attempting
operation. Should you have any questions,
contact your nearest Pioneer authorized
dealer or installation specialist.
Important
The serial number of this amplifier is writ-
ten on the bottom of the unit. For your own
security and convenience, write it down on
the enclosed warranty card. Keep the card
handy for future reference.
Composition of Manual
This manual applies to the GM-X942 and
GM-X742. However, the illustrations show
the GM-X942.
WARNING
· 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.
Before Using This Product
After-sales service for Pioneer
products
Please contact the dealer or distributor from where
you purchased the product for its after-sales ser-
vice (including warranty conditions) or any other
information. In case the necessary information is
not available, please contact the companies listed
below:
Please do not ship your product to the companies
at the addresses listed below for repair without
advance contact.
7 U.S.A.
Pioneer Electronics Service, Inc.
CUSTOMER SERVICE DEPARTMENT
P.O. Box 1760
Long Beach, CA 90801
800-421-1404
7 CANADA
Pioneer Electronics of Canada, Inc.
CUSTOMER SERVICE DEPARTMENT
300 Allstate Parkway
Markham, Ontario L3R 0P2
(905) 479-4411
1-877-283-5901
For warranty information please see the Limited
Warranty sheet included with your product.
PIONEER CORPORATION
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.
Publication de Pioneer Corporation.
Copyright © 1999 Pioneer Corporation.
Tous droits de reproduction et de traduction
réservés.
Printed in U.S.A.
Imprimé aux Etats-Unis
<HRD0123-A> UC
<99L00F0R01>
BRIDGEABLE POWER AMPLIFIER
AMPLIFICATEUR DE PUISSANCE
PONTABLE
Owner's Manual
GM-X942
GM-X742
Mode d'emploi
Setting the Unit
Gain Control
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.
Power Indicator
The power indicator lights when the
power is switched on.
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.
Cut Off Frequency Control
If the LPF/HPF select switch is set to
LPF (or HPF), you can select a cut off
frequency from 40 to 120 Hz.
Bass Boost Frequency Control
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.
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:
LPF/HPF Select
Audio frequency range
Speaker
Remarks
Switch
to be output
Type
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.
Connection Diagram
Connecting the Unit
CAUTION
· Disconnect the negative () terminal of the battery
to avoid the risk of short-circuit and damage to
the unit.
· Secure the wiring with cable clamps or adhesive
tape. To protect the wiring, wrap adhesive tape
around it where they lie against metal parts.
· Do not route wires where they will get hot, for
example where the heater will blow over them. If
the insulation heats up, it may become damaged,
resulting in a short-circuit through the vehicle
body.
· Make sure that wires will not interfere with mov-
ing parts of the vehicle, such as the gearshift,
handbrake or seat sliding mechanism.
· Do not shorten any wires. Otherwise the protec-
tion circuit may fail to work when it should.
· Never feed power to other equipment by cutting
the insulation of the power supply wire to tap
from the wire. The current capacity of the wire
will be exceeded, causing overheating.
Fuse (30 A)
Grommet
RCA input
Special red battery wire [RD-223] (sold separately).
After making all other connections at the amplifier,
connect the battery wire terminal of the amplifier to
the positive (+) terminal of the battery.
Ground wire (black) [RD-223] (sold separately).
Connect to metal body or chassis.
Amplifier with
RCA input jacks
GM-X942: Fuse (30 A)
× 2
GM-X742: Fuse (20 A)
× 2
Car stereo with
RCA output jacks
External Output
Connecting wires with RCA pin
plugs (sold separately).
RCA input jack
RCA output jack
Speaker output terminal
See the "Connecting the
Speaker wires" section
for speaker connection
instructions.
System remote control wire (sold separately).
Connect the male terminal of this wire to the system
remote control terminal of the car stereo (SYSTEM
REMOTE CONTROL). The female terminal can be con-
nected to the auto-antenna relay control terminal. If the car
stereo does not have a system remote control terminal, con-
nect the male terminal to the power terminal through the
ignition switch.
GM-X942
Speaker Channel
Speaker Type
Power
Two-channel
Subwoofer
Nominal input: Min. 120 W
Other than subwoofer
Max. input: Min. 200 W
One-channel
Subwoofer
Nominal input: Min. 330 W
Other than subwoofer
Max. input: Min. 600 W
GM-X742
Speaker Channel
Speaker Type
Power
Two-channel
Subwoofer
Nominal input: Min. 100 W
Other than subwoofer
Max. input: Min. 160 W
One-channel
Subwoofer
Nominal input: Min. 270 W
Other than subwoofer
Max. input: Min. 480 W
Fuse (30 A)
Back side
To prevent damage
· Do not ground the speaker wire directly or con-
nect a negative () lead wire for several speakers.
· This unit is for vehicles with a 12-volt battery and
negative grounding. Before installing it in a recre-
ational vehicle, truck, or bus, check the battery
voltage.
· If the car stereo is kept on for a long time while
the engine is at rest or idling, the battery may go
dead. Turn the car stereo off when the engine is at
rest or idling.
· If the system remote control wire of the amplifier
is connected to the power terminal through the
ignition switch (12 V DC), the amplifier will
always be on when the ignition is on-- regardless
of whether the car stereo is on or off. Because of
this, the battery could go dead if the engine is at
rest or idle.
· Speakers to be connected to the amplifier should
conform with the standards listed below. If they do
not conform, they may catch fire, emit smoke or
become damaged. The speaker impedance must be
1 to 8 ohms for stereo connection, and 2 to 8 ohms
for monaural and other bridge connection.
· Install and route the separately sold battery wire
as far away as possible from the speaker wires.
Install and route the separately sold battery wire
and ground wire, speaker wires, and the amplifier
as far away as possible from the antenna, antenna
cable and tuner.
· Cords for this product and those for other prod-
ucts may be different colors even if they have the
same function. When connecting this product to
another product, refer to the supplied Installation
manuals of both products and connect cords that
have the same function.
Selecting fine audio equipment such as the unit you've just purchased is only the start of your
musical enjoyment. Now it's time to consider how you can maximize the fun and excitement your
equipment offers. This manufacturer and the Electronic Industries Association's Consumer
Electronics Group want you to get the most out of your equipment by playing it at a safe level.
One that lets the sound come through loud and clear without annoying blaring or distortion--and,
most importantly, without affecting your sensitive hearing.
Sound can be deceiving. Over time your hearing "comfort level" adapts to higher volumes of
sound. So what sounds "normal" can actually be loud and harmful to your hearing. Guard against
this by setting your equipment at a safe level BEFORE your hearing adapts.
To establish a safe level:
· Start your volume control at a low setting.
· Slowly increase the sound until you can hear it comfortably and clearly, and without distortion.
Once you have established a comfortable sound level:
· Set the dial and leave it there.
Taking a minute to do this now will help to prevent hearing damage or loss in the future. After all,
we want you listening for a lifetime.
We Want You Listening For A Lifetime
Used wisely, your new sound equipment will provide a lifetime of fun and enjoyment. Since
hearing damage from loud noise is often undetectable until it is too late, this manufacturer and the
Electronic Industries Association's Consumer Electronics Group recommend you avoid prolonged
exposure to excessive noise. This list of sound levels is included for your protection.
Decibel
Level
Example
30
Quiet library, soft whispers
40
Living room, refrigerator, bedroom away from traffic
50
Light traffic, normal conversation, quiet office
60
Air conditioner at 20 feet, sewing machine
70
Vacuum cleaner, hair dryer, noisy restaurant
80
Average city traffic, garbage disposals, alarm clock at two feet.
THE FOLLOWING NOISES CAN BE DANGEROUS UNDER CONSTANT EXPOSURE
90
Subway, motorcycle, truck traffic, lawn mower
100
Garbage truck, chain saw, pneumatic drill
120
Rock band concert in front of speakers, thunderclap
140
Gunshot blast, jet plane
180
Rocket launching pad
Information courtesy of the Deafness Research Foundation.
Front side
Connecting the Unit
Connecting the Power Terminal
· 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.
1. Pass the battery wire from the
engine compartment to the interior
of the vehicle.
· After making all other connections to the
amplifier, connect the battery wire terminal of
the amplifier to the positive (+) terminal of
the battery.
2. Twist the battery wire, ground wire
and system remote control wire.
3. Attach lugs to wire ends. Lugs not
supplied.
· Use pliers, etc., to crimp lugs to wires.
4. Connect the wires to the terminal.
· Fix the wires securely with the terminal
screws.
Fuse (30 A)
Engine
compart-
ment
Interior of
the vehicle
Drill a 14 mm
hole into the
vehicle body.
Insert the O-ring rubber
grommet into the vehicle
body.
Twist
Positive terminal
GND terminal
Power terminal
Battery wire
System remote
control terminal
System remote
control wire
Ground wire
Connecting the Speaker Output
Terminals
1. Expose the end of the speaker wires
by about 10 mm and twist using
nippers or a cutter.
2. Attach lugs to speaker wire ends.
Lugs not supplied.
· Use pliers, etc., to crimp lugs to wires.
3. Connect the speaker wires to the
speaker output terminals.
· Fix the speaker wires securely with the termi-
nal screws.
· Connect the speaker wires, passing them
through the terminal cover.
4. Push on the terminal cover.
10 mm
Twist
Speaker wire
Lug
Fuse (30 A)
Battery wire
Ground wire
Lug
Lug
Connecting the Speaker wires
The speaker output mode can be two-chan-
nel (stereo), one-channel (mono), or three-
channel (stereo + mono). Connect the
speaker leads to suit the mode according to
the figures shown below.
Two-channel mode (stereo)
One-channel mode (mono)
Three-channel mode (stereo + mono)
The power amplifier is basically a two-
channel/one-channel bridgeable amplifier,
but three channels can be achieved by
combining the stereo and mono modes
using inductors and capacitors.
Three-channel mode, two-way system
Three-channel mode, three-way system
· Inductors (L1 and L2 in the diagrams)
act as low-pass filters. Capacitors (C1
and C2 in the diagrams) act as high-pass
filters. Inductors (L) are used for the
woofer/subwoofer, and capacitors (C)
are used for the high/mid-high.
· Remember when bridging an amplifier it
will see only half of the original speaker
impedance. Therefore, you must use
speakers that have ratings of 4 ohms or
higher. If you use speakers that have
lower impedance ratings it may cause
damage to the amplifier.
· When the inductors and capacitors are
connected to the speaker wires, secure or
solder them so they cannot be pulled
loose. Tape or use heat shrink on the
joints to prevent short circuits.
C2
C2
L1
L2
L2
C1
C1
C1
C1
L1
Component Guide
Speaker load Impedance
2
4
8
fc (Hz)
L (mH)
C (
µF)
L (mH)
C (
µF)
L (mH)
C (
µF)
50
6.4
1,600
12.70
800.0
25.50
400.0
80
4.0
1,000
8.00
500.0
16.00
250.0
125
2.5
640
5.10
300.0
10.00
160.0
200
1.6
400
3.20
200.0
6.40
100.0
320
1.0
250
2.00
125.0
4.00
62.0
500
0.64
160
1.30
80.0
2.60
40.0
800
0.4
100
0.80
50.0
1.60
25.0
1,250
0.25
64
0.50
30.0
1.00
16.0
2,000
0.16
40
0.30
20.0
0.64
10.0
3,200
0.1
25
0.20
12.5
0.40
6.2
5,000
0.06
16
0.13
8.0
0.26
4.0
8,000
0.04
10
0.08
5.0
0.16
2.5
10,000
0.03
8
0.06
4.0
0.13
2.0
Setting the Filter Constant
Low-pass filter (for subwoofer/woofer):
6 dB/octave
High-pass filter (for mid/mid-high):
6 dB/octave
Band-pass filter (combination of low-pass
filter and high-pass filter for mid-
bass/mid): 6 dB/octave
· A multi-channel system can be set up using a
combination of filters. The inductance (L) and
capacitance (C) will determine the frequency (fc)
that the speaker will reproduce. Refer to the chart
below to determine the components required.
· Use the capacitors specified. Non-polarized capac-
itors rated at over ±25 V should be used for C1
and C2 in the diagram. Because of the voltage
output of the amplifier, it is very important to use
non-polarized capacitors rated at or over 25 V.
This will prevent a safety hazard.
L2
C2
0dB
6dB
fCH 2fCH
fCL
fCL
2
0dB
6dB
f C
f
fC
2
C1
0dB
6dB
fC
2fC
f
L1
(Left)
Speaker
(Right)
Speaker (Mono)
Mid-high (Left)
Woofer (Mono)
Mid-high (Right)
High/mid-high
(Left)
Mid/mid-bass
(Left)
Woofer/subwoofer
(Mono)
Mid/mid-bass
(Right)
High/mid-high
(Right)
Speaker
output
terminal
Speaker wire
Terminal screw
Terminal cover
Specifications
Installation
GM-X942
Power source .............................................................................................................. 14.4 V DC (10.8 -- 15.1 V allowable)
Grounding system ............................................................................................................................................ Negative type
Current consumption ........................................................................................................ 26.1 A (at continuous power, 4
)
Average current drawn* ............................................................................................................ 8.5 A (4
for two channels)
14.6 A (4
for one channel)
Fuse .......................................................................................................................................................................... 30 A
× 2
Dimensions ........................................................................................................................ 270 (W)
× 60 (H) × 250 (D) mm
[10-5/8 (W)
× 2-3/8 (H) × 9-7/8 (D) in]
Weight ........................................................................................................ 4.0 kg (8.8 lbs) (Leads for wiring not included)
Maximum power output .................................................................................................................... 200 W
× 2 / 600 W × 1
Continuous power output ........................................................ 100 W
× 2 (at 14.4 V, 4 , 20 -- 20,000 Hz, 0.08% THD)
300 W
× 1 (at 14.4 V, 4 , 20 -- 20,000 Hz, 0.8% THD)
150 W
× 2 (at 14.4 V, 2 , 20 -- 20,000 Hz, 0.8% THD)
Load impedance ............................................................................................................................ 4
(1 -- 8 allowable)
(Bridge connection: 2 -- 8
allowable)
Frequency response ............................................................................................................ 10 -- 50,000 Hz (+0 dB, 1 dB)
Signal-to-noise ratio ...................................................................................................................... 105 dB (IHFA network)
Distortion ............................................................................................................................................ 0.005% (10 W, 1 kHz)
Separation ........................................................................................................................................................ 65 dB (1 kHz)
Low pass filter .................................................................................................................... Cut off frequency: 40 -- 120 Hz
Cut off slope: 12 dB/oct
High pass filter .................................................................................................................. Cut off frequency: 40 -- 120 Hz
Cut off slope: 12 dB/oct
Bass boost ...................................................................................................................................... Frequency: 40 -- 120 Hz
Gain: 0 -- 18 dB
Maximum input level/impedance .............................................................................................. 6.5 V/22 k
(0.4 -- 6.5 V)
Note:
· Specifications and the design are subject to possible modification without notice
due to improvements.
*Average current drawn
· The average current drawn is nearly the maximum current drawn by this unit
when an audio signal is input. Use this value when working out total current
drawn by multiple power amplifiers.
GM-X742
Power source .............................................................................................................. 14.4 V DC (10.8 -- 15.1 V allowable)
Grounding system ............................................................................................................................................ Negative type
Current consumption ........................................................................................................ 22.1 A (at continuous power, 4
)
Average current drawn* ............................................................................................................ 7.5 A (4
for two channels)
12.6 A (4
for one channel)
Fuse .......................................................................................................................................................................... 20 A
× 2
Dimensions ........................................................................................................................ 270 (W)
× 60 (H) × 193 (D) mm
[10-5/8 (W)
× 2-3/8 (H) × 7-5/8 (D) in]
Weight ........................................................................................................ 3.2 kg (7.0 lbs) (Leads for wiring not included)
Maximum power output .................................................................................................................... 160 W
× 2 / 480 W × 1
Continuous power output .......................................................... 80 W
× 2 (at 14.4 V, 4 , 20 -- 20,000 Hz, 0.08% THD)
200 W
× 1 (at 14.4 V, 4 , 20 -- 20,000 Hz, 0.8% THD)
120 W
× 2 (at 14.4 V, 2 , 20 -- 20,000 Hz, 0.8% THD)
Load impedance ............................................................................................................................ 4
(1 -- 8 allowable)
(Bridge connection: 2 -- 8
allowable)
Frequency response ............................................................................................................ 10 -- 50,000 Hz (+0 dB, 1 dB)
Signal-to-noise ratio ...................................................................................................................... 105 dB (IHFA network)
Distortion ............................................................................................................................................ 0.005% (10 W, 1 kHz)
Separation ........................................................................................................................................................ 65 dB (1 kHz)
Low pass filter .................................................................................................................... Cut off frequency: 40 -- 120 Hz
Cut off slope: 12 dB/oct
High pass filter .................................................................................................................. Cut off frequency: 40 -- 120 Hz
Cut off slope: 12 dB/oct
Bass boost ...................................................................................................................................... Frequency: 40 -- 120 Hz
Gain: 0 -- 18 dB
Maximum input level/impedance .............................................................................................. 6.5 V/22 k
(0.4 -- 6.5 V)
Note:
· Specifications and the design are subject to possible modification without notice
due to improvements.
*Average current drawn
· The average current drawn is nearly the maximum current drawn by this unit
when an audio signal is input. Use this value when working out total current
drawn by multiple power amplifiers.
CAUTION
· Do not install in:
--Places where it could injure the driver or pas-
sengers if the vehicle stops suddenly.
--Places where it may interfere with the driver,
such as on the floor in front of the driver's
seat.
· Make sure that wires are not caught in the sliding
mechanism of the seats, resulting in a short-cir-
cuit.
· Confirm that no parts are behind the panel when
drilling a hole for installation of the amplifier.
Protect all cables and important equipment such
as fuel lines, brake lines and electrical wiring
from damage.
· Install tapping screws in such a way that the screw
tip does not touch any wire. This is important to
prevent wires from being cut by vibration of the
car, which can result in fire.
· To prevent electric shock, do not install the ampli-
fier in places where it might come in contact with
liquids.
· To ensure proper installation, use the supplied
parts in the manner specified. If any parts other
than the supplied ones are used, they may damage
internal parts of the amplifier, or they may
become loose causing the amplifier to shut down.
To prevent malfunction
· To ensure proper heat dissipation of the amplifier,
be sure of the following during installation.
--Allow adequate space above the amplifier for
proper ventilation.
--Do not cover the amplifier with a floor mat or
carpet.
· Do not install the amplifier near a door where it
may get wet.
· Do not install the amplifier on unstable places
such as the spare tire board.
· The best location for installation differs with the
car model and installation location. Secure the
amplifier at a sufficiently rigid location.
· Make temporary connections first and check that
the amplifier and the system operate properly.
· After installing the amplifier, confirm that the
spare tire, jack and tools can be easily removed.
Example of installation on the floor
mat or on the chassis
1. Place the amplifier where it is to be
installed. Insert the supplied tapping
screws (4
× 18 mm) into the screw
holes. Push on the screws with a
screwdriver so they make marks
where the installation holes are to be
located.
2. Drill 2.5 mm diameter holes at the
point marked, and install the ampli-
fier, either on the carpet or directly
to the chassis.
Drill a 2.5 mm diameter hole
Tapping-screws
(4
× 18 mm)
Floor mat
or chassis
Nous vous remercions d'avoir porté votre
choix sur un appareil PIONEER. Il a été
conçu et fabriqué pour vous apporter de
nombreuses années de satisfaction.
En raison des problèmes posés par
l'installation de cet appareil, Pioneer vous
conseille de consulter un professionnel.
Avant d'utiliser l'appareil, prenez
connaissance de ce mode d'emploi et tout
spécialement des AVERTISSEMENTS.
Pour toute question concernant cet
appareil, veuillez vous adresser au
revendeur ou à l'installateur.
Composition du manuel
Ce manuel s'applique aux modèles
GM-X942 et GM-X742. Cependant, les
figures ne montrent que le modèle
GM-X942.
AVERTISSEMENT
· Utilisez le faisceau de câbles de liaison à la
batterie (un câble rouge et un câble de masse) qui
est vendu séparément [RD-223]. Reliez le câble
rouge à la borne positive (+) de la batterie et le
câble de masse à la carrosserie du véhicule.
· Ne touchez pas l'amplificateur quand vous avez
les mains mouillées, faute de quoi vous risquez de
ressentir une secousse électrique. Pareillement, ne
touchez pas l'amplificateur s'il est mouillé.
· Pour votre sécurité et celles des autres usagers de
la route, maintenez le niveau d'écoute à une
valeur telle que les bruits de la circulation
demeurent nettement perceptibles.
· Si le fusible monté sur le câble de liaison à la
batterie, câble qui est vendu séparément, a grillé
ou bien s'il en est ainsi de celui de l'amplificateur,
vérifiez soigneusement toutes les connexions
d'alimentation. Recherchez la cause de l'anomalie
puis corrigez-la; enfin, remplacez le fusible grillé
par un fusible de même taille et de même calibre.
· Pour éviter d'endommager l'amplificateur et les
haut-parleurs, le circuit de protection coupe
l'alimentation de l'amplificateur (les sons ne sont
plus émis) dès que survient une situation
anormale. Dans ce cas, mettez l'ensemble des
appareils hors tension et contrôlez les liaisons
entre l'amplificateur et les haut-parleurs. Le cas
échéant, recherchez la cause de l'anomalie et
corrigez-la.
· Consultez le revendeur si vous n'êtes pas en
mesure de résoudre le problème qui se pose à
vous.
· Pour éviter toute secousse électrique et tout risque
de court-circuit au cours des opérations de
raccordement et d'installation, n'oubliez pas de
débrancher le câble relié au pôle négatif de la
batterie () avant d'effectuer quelque opération
que ce soit.
· Avant d'effectuer un perçage requis par
l'installation de l'amplificateur, assurez-vous que
vous pouvez le faire sans danger pour les câbles,
canalisations, flexibles, etc., qui sont placés
derrière le panneau que vous devez percer.
Avant d'utiliser cet appareil
Service après-vente pour un
produit Pioneer
Pour toute question, et en particulier pour toute
question relative au service après-vente (y compris
celles qui relèvent de la garantie), veuillez vous
adresser au revendeur ou au distributeur auprès de
qui vous avez acquis ce produit. Dans l'hypothèse
où vous ne pourriez pas être renseigné comme
vous le désirez, consultez l'une des sociétés
mentionnées ci-dessous.
N'expédiez pas le produit à l'une de ces sociétés,
quelle qu'en soit la raison, avant d'y avoir été
expressément invité.
7 Etats-Unis
Pioneer Electronics Service, Inc.
CUSTOMER SERVICE DEPARTMENT
P.O. Box 1760
Long Beach, CA 90801
800-421-1404
7 Canada
Pioneer Electronics of Canada, Inc.
CUSTOMER SERVICE DEPARTMENT
300 Allstate Parkway
Markham, Ontario L3R 0P2
(905) 479-4411
1-877-283-5901
Pour toute question concernant la garantie,
veuillez consulter le document Garantie Limitée
qui accompagne le produit.
Réglage de l'appareil
Commande du gain
Si le niveau d'écoute est faible même
lorsque la commande de l'autoradio est
sur la position correspondant au maxi-
mum, tournez la commande de gain,
placée le devant de l'amplificateur, dans
le sens des aiguilles d'une montre.
Inversement, si vous constatez de la
distorsion lorsque vous augmentez le
niveau de sortie de l'autoradio, tournez
cette commande dans le sens contraire
des aiguilles d'une montre.
· Choisissez la position NORMAL si l'autora-
dio stéréo est équipé de prises Cinch (RCA)
(niveau de sortie standard à 500 mV). Si cet
appareil est utilisé conjointement avec un
autoradio stéréo Pioneer pourvu de prises
Cinch (RCA) sur lesquelles peuvent se trou-
ver une tension de sortie de 4 V ou plus,
réglez le niveau en fonction du niveau de
sortie de l'autoradio.
Commande de la fréquence de
coupure
Si le sélecteur LPF/HPF est placé sur la
position LPF (ou HPF), la fréquence de
coupure peut être choisie entre 40 et
120 Hz.
Témoin d'alimentation
Ce témoin s'éclaire lorsque l'amplifica-
teur est sous tension.
Commande d'amplitude de
l'accentuation des graves
Après avoir choisie la fréquence grave à
accentuer au moyen de la commande de
fréquence, il est possible de faire varier,
dans la plage de 0 à 18 dB, l'amplitude
des signaux au voisinage de cette
fréquence en agissant sur la commande
d'amplitude.
Commande de fréquence de
l'accentuation des graves
Cette commande permet de choisir la
fréquence, entre 40 Hz et 120 Hz, autour de
laquelle doit s'effectuer l'accentuation.
· Les commandes d'amplitude et de
fréquence de l'accentuation des graves
n'ont un effet que si le sélecteur LPF/HPF
est sur la position HPF (Filtre Passe-Haut).
Sélecteur LPF (Filtre passe-bas)/HPF (Filtre passe-haut)
Positionnez le sélecteur LPF/HPF comme indiqué ci-dessous en tenant compte de l'autoradio
et du type du haut-parleur relié au connecteur de sortie.
Sélecteur
Gamme des fréquences
Type de haut-
Remarques
LPF/HPF
disponibles en sortie
parleur
LPF (Gauche)
* -- 40 à 120 Hz
Haut-parleur
Utilisez un haut-parleur
d'extrêmes graves d'extrêmes graves.
OFF (Centre)
Tout le spectre des fréquences
Haut-parleur
pleine gamme
HPF (Droite)
* 40 à 120 Hz --
Haut-parleur
Choisissez cette position si
pleine gamme
les fréquences* très graves
sont inutiles compte tenu
des haut-parleurs utilisés.
* Reportez-vous au paragraphe "Commande de la fréquence de coupure".