Pioneer GM-D7400M Operating Instruction
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CLASS D MONO AMPLIFIER
AMPLIFICATEUR MONO DE CLASSE D
Owner’s Manual
GM-D7400M
Mode d’emploi
1
Before Using This Product ...................... 1
After-sales service for Pioneer products .......... 1
Information to User .......................................... 2
Important .......................................................... 2
Visit our website ................................................ 2
About This Product .......................................... 2
CAUTION ........................................................ 2
WARNING ........................................................ 2
Setting the Unit .......................................... 3
Gain Control ...................................................... 3
LPF (Low-Pass-Filter) Cut Off Frequency
Control ........................................................ 4
Power Indicator (Blue) ...................................... 4
Input Switch ...................................................... 4
Bass Boost Control ............................................ 4
Setting the Gain properly .................................. 5
Connecting the Unit .................................. 6
Connection Diagram ........................................ 7
Solderless Terminal Connections ...................... 8
Connecting the Power Terminal ........................ 8
Connecting the Speaker Output Terminals ...... 9
Using the Speaker Input .................................... 9
Connecting the Speaker Wires .......................... 9
Installation ................................................ 10
Example of installation on the floor mat
or on the chassis ...................................... 11
Specifications .......................................... 12
Thank you for purchasing this PIONEER
product. It is designed to give you many
years of enjoyment.
PIONEER SUGGESTS USING A PROFESSIONAL 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.
Contents Before Using This Product
After-sales service for Pioneer
products
Please contact the dealer or distributor from
where you purchased the product for its aftersales service (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 (USA) Inc.
CUSTOMER SUPPORT DIVISION
P.O. Box 1760
Long Beach, CA 90801-1760
800-421-1404
7 CANADA
Pioneer Electronics of Canada, Inc.
CUSTOMER SATISFACTION
DEPARTMENT
300 Allstate Parkway
Markham, Ontario L3R 0P2
1-877-283-5901
905-479-4411
For warranty information please see the Limited
Warranty sheet included with your product.
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2
Information to User
Alteration or modifications carried out
without appropriate authorization may
invalidate the user’s right to operate the
equipment.
Important
The serial number of this amplifier is written 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.
Visit our website
Visit us at the following site:
http://www.pioneerelectronics.com
1 Register your product. We will keep the details of
your purchase on file to help you refer to this
information in the event of an insurance claim
such as loss or theft.
2 Receive updates on the latest products and tech-
nologies.
3 Download owner’s manuals, order product cata-
logues, research new products, and much more.
About This Product
This product is a class D amplifier for the
subwoofer. If both L (left) and R (right)
channels are connected to the RCA input
of this product, output is mixed because
this product is a mono amplifier.
CAUTION
• Never replace the fuse with one of greater value
or rating than the original fuse. Use of an
improper fuse could result in overheating and
smoke and could cause damage to the product
and injury including burns.
• Use the supplied hexagonal wrench to tighten
screws when fastening wires to the terminal. The
use of a long, commercially available hexagonal
wrench can cause excessive torque to be applied
possibly resulting in damage to terminals and
wires.
WARNING
• Handling the cord on this product or cords
associated with accessories sold with the product
may expose you to chemicals listed on
proposition 65 known to the State of California
and other governmental entities to cause cancer
and birth defects or other reproductive harm.
Wash hands after handling.
• We recommend that you use the special red battery and ground wire [RD-228], 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
subwoofer 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 subwoofer, 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 subwoofer.
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.
• DO NOT allow amplifier to come into contact
with liquids due to, for example, the location
where the amplifier is installed. Electrical shock
could result. Also, amplifier and speaker damage,
smoke, and overheating could result from contact
with liquids. In addition, the amplifier surface
and the surface of any attached speakers could
become hot to the touch and minor burns could
result.
3
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 clockwise. If the sound
distorts when the volume is turned up, turn the gain control counterclockwise.
• 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.
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Power Indicator (Blue)
The power indicator lights when the power is switched on.
LPF (Low-Pass-Filter) Cut Off Frequency Control
You can select a cut off frequency from 40 Hz to 240 Hz.
Bass Boost Control
You can select a bass boost level from 0 dB, 6 dB and 12 dB.
Input Switch
It is possible to input from a car stereo external output or a car stereo speaker output. Switch
the input switch before turning on the power. Since switching the input switch while the
power is on can cause a loud noise to be emitted from the speakers, the power is turned off
by a protection function. When using an external output, slide the switch to the right (RCA).
For connection instructions, see the “Connection Diagram” section. When using a speaker
output, slide the switch to the left (SP). In this case, it is necessary to use the supplied speaker input wire with RCA pin cord. For details, see the “Using the Speaker Input” section.
5
Setting the Unit
Setting the Gain properly
• This unit is equipped with a protective function to
prevent malfunction of the unit itself and speakers
from too much output, improper use or improper
connection.
• When outputting sound at high volume etc., this
function will cut off the sound output in a few
seconds. But this is not a malfunction. When you
turn down the volume of the head unit the sound
output will be restored.
• If sound output is cut, the gain control of this unit
may be improperly set. To ensure continuous
sound output at increased volume of the head unit,
set the gain control of the amplifier to a proper
position according to the preout maximum output
level of the head unit.
Gain Control of This Unit
• The above illustration shows the gain set to
NORMAL.
There is no need to decrease the volume of the
head unit and too much output is controlled.
Relationship between the gain of the
amplifier and the output power of the
head unit
• If you raise the gain of the amplifier to an improper level, only distortion is increased and the power
increases only slightly.
Signal waveform when outputting at high
volume by the gain control of the amplifier
• With high output the signal waveform is distorted,
if you raise the gain of the amplifier the power
changes only slightly.
• If you decrease the volume of the head unit and
set the gain control of the amplifier to the proper
position but still the sound cuts out from time to
time, contact the nearest authorized PIONEER
Service Station.
Amplifier gain
(normal)
Amplifier gain
(maximum)
Head unit volume steps
Powe r
Normal gain
Powe r
Head unit volume steps
Maximum gain
Equal power
Preout level: 2 V
(Standard: 500 mV)
Preout level: 4 V
Preout level: 6.5 V
Normal gain
Equal power
Signal
waveform
Amplifier gain
(normal)
Signal
waveform
Amplifier gain
(maximum)
Maximum gain
Connecting the Unit
6
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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 moving parts of the vehicle, such as the gearshift,
handbrake or seat sliding mechanism.
• Do not shorten any wires. Otherwise the protection 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.
• Never replace the fuse with one of greater value
or rating than the original fuse. Use of an improper fuse could result in overheating and smoke and
could cause damage to the product and injury
including burns.
CAUTION:
To prevent damage and/or injury
• Do not ground the speaker wire directly or connect 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 recreational 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 idling.
• DO NOT connect a subwoofer with a lower
impedance than specified in the “Connecting the
Speaker Wires” section. Amplifier damage,
smoke, and overheating could result from a nonspecified connection. The amplifier surface could
also become hot to the touch and minor burns
could result.
• Connect either of two subwoofers to the amplifier; 1: a subwoofer with a 250 W or larger nominal input and an impedance 4 Ω, or 2: a subwoofer with a 420 W or larger nominal input and
an impedance 2 Ω. If the nominal input and
impedance are out of the above ranges, the subwoofer may catch fire, emit smoke or become
damaged.
• 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,
ground wire, speaker wires and the amplifier as
far away as possible from the antenna, antenna
cable and tuner.
7
Connecting the Unit
Connection Diagram
• This diagram shows connections using external output (subwoofer output). Slide the input switch to the
right (RCA).
Fuse (40 A) × 2
Grommet
Special red battery wire [RD-228] (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-228] (sold separately)
Connect to metal body or chassis.
Fuse (25 A) × 2
Car stereo with
RCA output jacks
External Output
(Subwoofer output)
Connecting wire with RCA
pin plugs (sold separately).
RCA input jack
Speaker 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 connected to the auto-antenna relay control
terminal. If the car stereo does not have a system remote control terminal, connect the male terminal to the power terminal through the
ignition switch.
Reverse side
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Solderless Terminal Connections
• Do not connect a cord having an exposed core
wire to the power terminals of this amplifier
(Power terminal, GND terminal, System remote
control terminal). Disconnection or breakage of
the core wire can cause a fire or short-circuit.
• Since the wire will become loose over time, it
must be periodically inspected and tightened as
necessary.
• Do not solder or bind the ends of the twisted
wires.
• Fasten while making sure to not to clamp the
insulating sheath of the wire.
• Use the supplied hexagonal wrench to tighten and
loosen the terminal screw of the amplifier.
Securely fasten the wire with the terminal screw.
However, since excessively tightening the terminal screw of the System remote control has the
risk of damaging the wire, be careful not to tighten excessively by observing the status of the wire
when tightening.
Connecting the Power Terminal
• We recommend that you use the special red battery and ground wire [RD-228], which is sold
separately. Connect the battery wire directly to
the car battery positive terminal (+) and the
ground wire to the car body.
• Recommended wires size (AWG: American Wire
Gauge) is as follows. The battery wire and the
ground wire must be same size.
• Use a 10 AWG to 20 AWG wire for the system
remote control wire.
Battery Wire and Ground Wire Size
Wire Length less than less than less than
5.7 m 9.0 m 14.4 m
less than less than less than
18 ft. 29 ft. 47 ft.
Wire Size 8 AWG 6 AWG 4 AWG
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. Connect the wires to the terminal.
• Fix the wires securely with the terminal
screws.
WARNING
Failure to securely fasten the battery wire to the terminal using the terminal screws could cause the terminal area to overheat and could result in damage
and injury including minor burns.
Engine
compartment
Interior of
the vehicle
Drill a 13 mm
(1/2 in.) hole
into the vehicle body.
Insert the O-ring rubber
grommet into the vehicle
body.
Positive (+)
terminal
Fuse (40 A) × 2
GND terminal
Power terminal
Battery wire
System remote
control terminal
System remote
control wire
Ground wire
Terminal screws
9
Connecting the Unit
Connecting the Speaker Output
Terminals
• Use a 10 AWG to 16 AWG wire for the speaker
wire.
1. Expose the end of the speaker wires
using nippers or a cutter by about
10 mm to 12 mm (3/8 in.).
2. Connect the speaker wires to the
speaker output terminals.
• Fix the speaker wires securely with the terminal screws.
Using the Speaker Input
Connect the car stereo speaker output
wires to the amplifier using the supplied
speaker input wire with RCA pin cord.
• Slide the input switch to the left (SP).
7 Connections when using the speaker
input
Connecting the Speaker Wires
Connect the speaker leads according to the
figures shown below.
10 mm to 12 mm (3/8 in.)
Speaker output
terminal
Terminal screws
Speaker wire
Speaker output
Car Stereo
White: Black: Black: Red:
Left + Left ≠ Right ≠ Right +
Speaker input
wire with RCA
pin cord
To RCA input
jack of this unit.
Subwoofer
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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-circuit.
• 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.
• DO NOT allow amplifier to come into contact
with liquids due to, for example, the location
where the amplifier is installed. Electrical shock
could result. Also, amplifier and speaker damage,
smoke, and overheating could result from contact
with liquids. In addition, the amplifier surface
and the surface of any attached speakers could
become hot to the touch and minor burns could
result.
• 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.
• Never replace the fuse with one of greater value
or rating than the original fuse. Use of an improper fuse could result in overheating and smoke and
could cause damage to the product and injury
including burns.
CAUTION:
To prevent malfunction and/or injury
• 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 allow amplifier to come into contact
with liquids due to, for example, the location
where the amplifier is installed. Electrical shock
could result. Also, amplifier and speaker damage,
smoke, and overheating could result from contact
with liquids. In addition, the amplifier surface
and the surface of any attached speakers could
become hot to the touch and minor burns could
result.
• 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.
Installation
11
Installation
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 mm × 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 (1/8 in.) diameter holes
at the point marked, and install the
amplifier, either on the carpet or
directly to the chassis.
Drill a 2.5 mm (1/8 in.)
diameter hole
Tapping screw
(4 mm × 30 mm)
Floor
mat or
chassis
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