PIONEER GM-4000F/XR/ES
Owner's Manual

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. or use a single 4 � speaker per channel. If you have any questionsauthorized please contact your local or concerns, Pioneer dealer or call Pioneer customer service.

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.
� 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.

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

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.

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.

CAUTION

Owner�s Manual

GM-4000F
Manual del Propietario

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
Diagram A - Proper
8 + Ohm Speaker 8 + Ohm Speaker L+ Pioneer Amplifier 4 Ohm Bridged Mode RL+ Pioneer Amplifier 2 Ohm Bridged Mode

Diagram B - Improper
4 + Ohm Speaker 4 + Ohm Speaker R-

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. Blvd.Manuel Avila Camacho 138 10 piso Col.Lomas de Chapultepec, Mexico, D.F. 11000 TEL: 55-9178-4270

Published by Pioneer Corporation. Copyright © 2004 by Pioneer Corporation. All rights reserved. Publicado por Pioneer Corporation. Copyright © 2004 Pioneer Corporation. Todos los derechos reservados. Printed in U.S.A. Impreso en los EE.UU.

Do NOT install or use your Pioneer amplifier by wiring speakers rated at 4 Ohm (or lower) in parallel to achieve a 2 Ohm (or lower) bridged mode (Diagram B). Amplifier damage, smoke, and overheating could result from improper bridging. The amplifier surface could also become hot to the touch and minor burns could result. To properly install or use a bridged mode for a two-channel amplifier and achieve a 4 � load, wire two 8 � speakers in parallel with Left + and Right - (Diagram A) or use a single 4 � speaker. For a four-channel amplifier, follow the speaker output connection diagram for bridging as shown on the back of your amplifier, and wire two 8 � speakers in parallel to achieve a 4 � load

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. 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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