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Setting The Unit; Connecting The Unit - Pioneer GM-7300M Owner's Manual

Mono power amplifier
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Setting the Unit

LPF (Low-Pass-Filter) Cut Off
Frequency Control
You can select a cut off frequency
from 40 Hz to 240 Hz.
BFC (Beat Frequency Control)
Gain Control
If you hear a beat while
If the sound level is too low, even
listening to an AM broadcast
when the volume of the car stereo
with your car stereo, change
used along with this power
the BFC switch using a small
amplifier is turned up, turn gain
standard tip screwdriver.
control on the front of the power
amplifier clockwise. If the sound
distorts when the volume is turned
up, turn the gain control counter-
• 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 control counter-clockwise.
Power Indicator
Bass Boost Control Switch
The power indicator lights when the
You can select a bass boost level
power is switched on.
from 0 dB, 6 dB and 12 dB.

Connecting the Unit

• Disconnect the negative (–) terminal of the battery
• Make sure that wires will not interfere with mov-
to avoid the risk of short-circuit and damage to
ing parts of the vehicle, such as the gearshift,
the unit.
handbrake or seat sliding mechanism.
• Secure the wiring with cable clamps or adhesive
• Do not shorten any wires. Otherwise the protec-
tape. To protect the wiring, wrap adhesive tape
tion circuit may fail to work when it should.
around it where they lie against metal parts.
• Never feed power to other equipment by cutting
• Do not route wires where they will get hot, for
the insulation of the power supply wire to tap
example where the heater will blow over them. If
from the wire. The current capacity of the wire
the insulation heats up, it may become damaged,
will be exceeded, causing overheating.
resulting in a short-circuit through the vehicle
• Never replace the fuse with one of greater value
or rating than the original fuse. Use of an improp-
er fuse could result in overheating and smoke and
could cause damage to the product and injury
including burns.
To prevent damage and/or injury
• Do not ground the speaker wire directly or con-
• Connect a subwoofer with a 290 W or larger nom-
inal input and an impedance between 2 Ω and 8 Ω
nect a negative (–) lead wire for several speakers.
• This unit is for vehicles with a 12-volt battery and
to the amplifier. If the nominal input and imped-
negative grounding. Before installing it in a recre-
ance are out of the above ranges, the subwoofer
ational vehicle, truck or bus, check the battery
may catch fire, emit smoke or become damaged.
• Install and route the separately sold battery wire
• If the car stereo is kept on for a long time while
as far away as possible from the speaker wires.
the engine is at rest or idling, the battery may go
Install and route the separately sold battery wire,
dead. Turn the car stereo off when the engine is at
ground wire, speaker wires and the amplifier as
rest or idling.
far away as possible from the antenna, antenna
• If the system remote control wire of the amplifier
cable and tuner.
is connected to the power terminal through the
• Cords for this product and those for other prod-
ignition switch (12 V DC), the amplifier will
ucts may be different colors even if they have the
always be on when the ignition is on— regardless
same function. When connecting this product to
of whether the car stereo is on or off. Because of
another product, refer to the supplied manuals of
this, the battery could go dead if the engine is at
both products and connect cords that have the
rest or idling.
same function.
Connection Diagram
Fuse (30 A)
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.
Fuse (30 A)
Ground wire (black) [RD-223] (sold separately)
Connect to metal body or chassis.
Connecting wire with RCA
pin plugs (sold separately).
Car stereo with
RCA output jacks
External Output
(Subwoofer output)
Front side
RCA input jack
Speaker input terminal
Back side
See the "Using the
Speaker Input" section.
Fuse (30 A) × 2
Speaker terminal
System remote control wire (sold separately)
See the "Connecting the
Connect the male terminal of this wire to the system remote control
Speaker Wires" section
terminal of the car stereo (SYSTEM REMOTE CONTROL). The
for speaker connection
female terminal can be connected to the auto-antenna relay control
terminal. If the car stereo does not have a system remote control ter-
minal, connect the male terminal to the power terminal through the
ignition switch.
Connecting the Power Terminal
• Always use the special red battery and ground
Failure to securely fasten the battery wire to the ter-
wire [RD-223], which is sold separately. Connect
minal using the terminal screws could cause the ter-
the battery wire directly to the car battery positive
minal area to overheat and could result in damage
terminal (+) and the ground wire to the car body.
and injury including minor burns.
1. Pass the battery wire from the
Connecting the Speaker Terminals
engine compartment to the interior
of the vehicle.
1. Expose the end of the speaker wires
• After making all other connections to the
amplifier, connect the battery wire terminal of
using nippers or a cutter by about
the amplifier to the positive (+) terminal of
10 mm (3/8 in.) and twist.
the battery.
2. Attach lugs to speaker wire ends.
Fuse (30 A)
Interior of
Lugs not supplied.
the vehicle
• Use pliers, etc., to crimp lugs to wires.
3. Connect the speaker wires to the
speaker terminals.
Fuse (30 A)
Drill a 14 mm
Positive terminal
(1/2 in.) hole
• Fix the speaker wires securely with the termi-
into the vehicle
Insert the O-ring rubber
nal screws.
grommet into the vehicle
Terminal screw
2. Twist the battery wire, ground wire
and system remote control wire.
3. Attach lugs to wire ends. Lugs not
Speaker terminal
• Use pliers, etc., to crimp lugs to wires.
4. Connect the wires to the terminal.
Speaker wire
• Fix the wires securely with the terminal
GND terminal
Power terminal
System remote
control terminal
System remote
control wire
Ground wire
Battery wire



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