User manual PIONEER GM-X544

[. . . ] When the unit does not operate properly, contact your dealer or the nearest authorized PIONEER Service Station. 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. Always use the special red battery and ground wire [RD-223], which is sold separately. Do not touch the amplifier with wet hands. [. . . ] After making all other connections to the amplifier, connect the battery wire terminal of the amplifier to the positive (+) terminal of the battery. 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. 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 idle. 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 1 to 8 ohms. But in case of two-channel and other bridge connections, the speaker impedance must be 2 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. You must attach the supplied terminal cover to the speaker output terminal. Fix the speaker wires securely with the terminal screws. [. . . ] --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. [. . . ]