32
GM-X1024,GM-X924
Connecting the Unit
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
recreational vehicle, truck, or bus, check the bat-
tery 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 blue 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.
• 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.
• Speakers to be connected to the amplifier should
conform with the standards listed below.
Otherwise damage will occur to the speaker. The
speaker impedance must be 1 to 8 ohms. (2 to
8
Ω
for stereo, monaural and other bridge
connections.)
CAUTION
• Disconnect the negative (–) terminal of the bat-
tery 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.
Speaker Channel
Speaker Type
Power
Four-channel
Sub-woofer
Nominal input: Min. 65 W
Other than sub-woofer
Max. input: Min. 130 W
Two-channel
Sub-woofer
Nominal input: Min. 150 W
Other than sub-woofer
Max. input: Min. 300 W
Three-channel
Sub-woofer
Nominal input: Min. 65 W
Speaker output A
Other than sub-woofer
Max. input: Min. 130 W
Three-channel
Sub-woofer
Nominal input: Min. 150 W
Speaker output B
Other than sub-woofer
Max. input: Min. 300 W
Connection Diagram
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
Car stereo with
RCA output jacks
RCA input jack A, B
RCA output jack
Blue [RD-223] (sold separately).
Connect the male terminal of this wire to the blue wire 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 ter-
minal to the power terminal through the ignition switch.
Fuse (30 A)
Fuse (30 A)
Reverse side
Connecting wires with RCA pin
plugs (sold separately).
Connecting wires with RCA pin
plugs (sold separately).
External Output
For details on how to connect to RCA
input jacks A and B, see the “Connecting
the Speakers and Input wires” section.
If only one input plug is used, do not
connect anything to RCA input jack B.
Speaker output terminal
See the “Connecting the
Speakers and Input wires”
section for speaker connec-
tion instructions.
Fuse (30 A)
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