Before Using This Product
BRIDGEABLE FOUR-CHANNEL POWER AMPLIFIER AMPLIFICADOR DE POTENCIA DE CUATRO CANALES EN PUENTE
Thank you for purchasing this PIONEER product. Before attempting operation, be sure to read this manual.

Setting the Unit

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.

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.
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 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

The power indicator lights when the power is switched on.

Composition of Manual

This manual applies to the GM-X574 and GM-X374. However, the illustrations show the GM-X574.

Owners Manual

In case of trouble
When the unit does not operate properly, contact your dealer or the nearest authorized PIONEER Service Station.

BFC (Beat Frequency Control) Switch
If you hear a beat while listening to an AM broadcast with your car stereo, change the BFC switch using a small standard tip screwdriver.

GM-X574 GM-X374

Manual del Propietario

PIONEER CORPORATION

4-1, MEGURO 1-CHOME, MEGURO-KU, TOKYO 153-8654, JAPAN
PIONEER ELECTRONICS (USA) INC. P.O. Box 1540, Long Beach, California 90801-1540, U.S.A. TEL: (800) 421-1404 PIONEER EUROPE NV Haven 1087, Keetberglaan 1, B-9120 Melsele, Belgium TEL: (0) 3/570.05.11 PIONEER ELECTRONICS ASIACENTRE PTE. LTD. 253 Alexandra Road, #04-01, Singapore 159936 TEL: 65-6472-1111 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 OP2, Canada TEL: (905) 479-4411 PIONEER ELECTRONICS DE MEXICO, S.A. de C.V. San Lorenzo 1009 3er. Piso Desp. 302 Col. Del Valle Mexico, D.F. C.P. 03100 TEL: 55-5688-52-90
LPF (Low-Pass Filter)/HPF (High-Pass Filter) Select Switch Input Select Switch
For two-channel input, slide this switch to the left. For four-channel input, slide this switch to the right.
Published by Pioneer Corporation. Copyright 2002 by Pioneer Corporation. All rights reserved. Publicado por Pioneer Corporation. Copyright 2002 Pioneer Corporation. Todos los derechos reservados. Printed in U.S.A. Impreso en los EE.UU.
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 Switch
LPF (Left) OFF (Center) HPF (Right)
Audio frequency range to be output
Very Low Frequency range Full range Low Frequency range to High Frequency range

Speaker Type

Subwoofer Full range Full range

Remarks

Connect a subwoofer. Use if you want to cut the very low frequency range because it is not necessary for the speakers you are using.

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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 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.

GM-X374 Speaker Channel

Four-channel Two-channel Three-channel Speaker output A Three-channel Speaker output B

Connection Diagram

Subwoofer Other than subwoofer Subwoofer Other than subwoofer Subwoofer Other than subwoofer Subwoofer Other than subwoofer
Nominal input: Min. 40 W Max. input: Min. 70 W Nominal input: Min. 100 W Max. input: Min. 200 W Nominal input: Min. 40 W Max. input: Min. 70 W Nominal input: Min. 100 W Max. input: Min. 200 W Fuse (30 A) Grommet RCA input Connecting wires with RCA pin plugs (sold separately). Car stereo with RCA output jacks Amplifier with RCA input jacks 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.

To prevent damage

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

Front side

Speaker input terminal See the Using the Speaker Input section.

GM-X574 Speaker Channel

Nominal input: Min. 55 W Max. input: Min. 100 W Nominal input: Min. 135 W Max. input: Min. 260 W Nominal input: Min. 55 W Max. input: Min. 100 W Nominal input: Min. 135 W Max. input: Min. 260 W Speaker output terminal See the Connecting the Speaker wires section for speaker connection instructions. GM-X574: Fuse (25 A) 2 GM-X374: Fuse (30 A) 1

RCA output jack

RCA input jack B RCA input jack A

Back side

Connecting wires with RCA pin plugs (sold separately).
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.
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.
4. Connect the wires to the terminal.
Fix the wires securely with the terminal screws. GND terminal System remote control terminal System remote control wire Ground wire Power terminal
3. Connect the speaker wires to the speaker output terminals.
Connect the speaker wires, passing them through the terminal cover. Fix the speaker wires securely with the terminal screws. Terminal screw

Using the Speaker Input

Connect the car stereo speaker output wires to the amplifier using the supplied speaker input connector.
Do not connect both the RCA input and the speaker input at the same time.
Connecting the Speaker wires
The speaker output mode can be four-channel, three-channel (stereo + mono) or two-channel (stereo, mono). Connect the speaker leads to suit the mode according to the figures shown below.
When either the RCA input or the speaker input is connected, RCA output becomes functional. Do not connect both the RCA input and the speaker input at the same time.
Two-channel mode (stereo)
Input Select Switch Slide this switch to the left. Speaker input terminal A
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. Engine Fuse (30 A) compart- Interior of the vehicle ment
7 Connections when using the speaker input

Speaker (Left)

Four-channel mode
Input Select Switch For two-channel input, slide this switch to the left. For four-channel input, slide this switch to the right. Speaker input terminal A Speaker input terminal B

Speaker output terminal (Left) Speaker out A (Right)

Battery wire

Speaker output Speaker wire

Speaker input connector

2. Twist the battery wire, ground wire and system remote control wire.
1. Expose the end of the speaker wires using nippers or a cutter by about 10 mm and twist.
White/black: Left White: Left +
Gray/black: Right Gray: Right +
Three-channel mode 2. Attach lugs to speaker wire ends. Lugs not supplied.
Use pliers, etc., to crimp lugs to wires. Lug Speaker input connector To speaker input terminal of this unit. Input Select Switch For two-channel input, slide this switch to the left. For four-channel input, slide this switch to the right. Speaker input terminal A Speaker wire Ground wire Lug
Use pliers, etc., to crimp lugs to wires. Lug

Speaker input terminal B

Speaker output terminal
Battery wire Speaker input connector

Speaker out B (Mono)

3. Attach lugs to wire ends. Lugs not supplied.
Fuse (30 A) Drill a 14 mm Positive terminal hole into the Insert the O-ring rubber vehicle body. grommet into the vehicle body.
Connecting the Speaker Output Terminals
4. Push on the terminal cover.
(Right) Speaker out B (Left)

Two-channel mode (mono)

(Left) Speaker out A (Right)
Terminal cover Car Stereo

Speaker (Right)

Speaker (Mono)

Installation

Do not install in: Places where it could injure the driver or passengers if the vehicle stops suddenly. Places where it may interfere with the driver, such as on the floor in front of the drivers 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. To prevent electric shock, do not install the amplifier 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.

Specifications

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 (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 amplifier, either on the carpet or directly to the chassis.

Tapping-screws (mm)

GM-X574
Power source.... 14.4 V DC (10.8 15.1 V allowable) Grounding system..... Negative type Current consumption.... 26.5 A (at continuous power, 4 ) Average current drawn*.... 9.1 A (4 for four channels) 14.2 A (4 for two channels) Fuse..... 25 A 2 Dimensions.... 269 (W) 50 (H) 309 (D) mm Weight..... 3.7 kg (Leads for wiring not included) Maximum power output.... 100 W 4 / 260 W 2 Continuous power output... 50 W 4 (at 14.4 V, 4 , 20 20,000 Hz, 0.15% THD) 130 W 2 (at 14.4 V, 4 , 20 20,000 Hz, 0.8% THD) 65 W 4 (at 14.4 V, 2 , 20 20,000 Hz, 0.8% THD) Load impedance.... 4 (allowable) (Bridge connection: allowable) Frequency response... 10 45,000 Hz (+0 dB, 1 dB) Signal-to-noise ratio.... 97 dB (IEC-A network) Distortion..... 0.008% (10 W, 1 kHz) Separation..... 65 dB (1 kHz) Low pass filter..... Cut off frequency: 80 Hz Cut off slope: 12 dB/oct High pass filter..... Cut off frequency: 80 Hz Cut off slope: 12 dB/oct Maximum input level/impedance... RCA: 6.5 V/22 k (0.2 6.5 V) Speaker: 26 V/40 k (0.V)

GM-X374

Power source.... 14.4 V DC (10.8 15.1 V allowable) Grounding system..... Negative type Current consumption.... 19.2 A (at continuous power, 4 ) Average current drawn*.... 6.7 A (4 for four channels) 10.9 A (4 for two channels) Fuse...... 30 A Dimensions.... 265 (W) 50 (H) 237 (D) mm Weight..... 2.8 kg (Leads for wiring not included) Maximum power output..... 70 W 4 / 200 W 2 Continuous power output... 35 W 4 (at 14.4 V, 4 , 20 20,000 Hz, 0.08% THD) 100 W 2 (at 14.4 V, 4 , 20 20,000 Hz, 0.8% THD) 50 W 4 (at 14.4 V, 2 , 20 20,000 Hz, 0.8% THD) Load impedance.... 4 (allowable) (Bridge connection: allowable) Frequency response... 10 45,000 Hz (+0 dB, 1 dB) Signal-to-noise ratio..... 100 dB (IEC-A network) Distortion..... 0.008% (10 W, 1 kHz) Separation..... 65 dB (1 kHz) Low pass filter..... Cut off frequency: 80 Hz Cut off slope: 12 dB/oct High pass filter..... Cut off frequency: 80 Hz Cut off slope: 12 dB/oct Maximum input level/impedance... RCA: 6.5 V/22 k (0.2 6.5 V) Speaker: 26 V/40 k (0.V)

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.