Pioneer GM-4000F owner manual Setting the Unit, Connecting the Unit, Gain Control, Power Indicator

Setting the Unit

Gain Control

Adjusting the gain controls A and B will help match the output of the car stereo to the Pioneer amplifier. Normally, set the gain controls to the “NORMAL” position. If the output is low, even when the volume of the car stereo is turned up, turn these controls clockwise. If there is distortion when the volume of the car stereo is turned up, turn these controls counter-clockwise.

Power Indicator

The power indicator lights when the power is switched on.

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.

• 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

Connection Diagram

	Fuse (30 A)
	Special red battery wire [RD-223] (sold separately)
Grommet	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.

•	If you only use one input plug, set the gain
	controls for speaker outputs A and B to the
	same position.
•	When using with an RCA equipped car
	stereo (standard output of 500 mV), set to

could cause damage to the product and injury

including burns.

RCA input

Connecting wires with RCA pin plugs (sold separately).

Amplifier with RCA input jacks

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.

CAUTION:

To prevent damage and/or injury

•	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

• 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 2 to 8 ohms. But in case of two-channel and

External Output

If only one input plug is used, do not connect anything to RCA input jack B.

Car stereo with RCA output jacks

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

other bridge connections, the speaker impedance

must be 4 to 8 ohms.

• 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.

• Cords for this product and those for other prod-

Front side

Speaker input terminal

See the “Using the Speaker Input” section.

Input Select Switch

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:

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.

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.

RCA output jack	RCA input jack B
	RCA input jack A

For two-channel input, slide this switch to the left. For four-channel input, slide this switch to the right.

LPF/HPF Select	Audio frequency range	Speaker	Remarks
Switch	to be output	Type
LPF (left)	Very Low Frequency range	Subwoofer	Connect a subwoofer.
OFF (center)	Full range	Full range

Speaker Channel	Speaker Type	Power
Four-channel	Subwoofer	Nominal input: Min. 45 W
	Other than subwoofer	Max. input: Min. 70 W

Fuse (25 A)

Back side

Connecting wires with RCA pin plugs (sold separately).

HPF (right)	Low Frequency range to	Full range	Use if you want to cut the
	High Frequency range		very low frequency range
			because it is not necessary
			for the speakers you are
			using.

Two-channel	Subwoofer	Nominal input: Min. 125 W
	Other than subwoofer	Max. input: Min. 150 W
Three-channel	Subwoofer	Nominal input: Min. 45 W
Speaker output A	Other than subwoofer	Max. input: Min. 70 W
Three-channel	Subwoofer	Nominal input: Min. 125 W
Speaker output B	Other than subwoofer	Max. input: Min. 150 W

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 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.