User manual KENWOOD KAC-645

[. . . ] To prevent damage to the machine, take the following precautions: · Be sure the unit is connected to a 12V DC power supply with a negative ground connection. Do not open the top or bottom covers of the unit. Do not install the unit in a spot exposed to direct sunlight or excessive heat or humidity. Also avoid places with too much dust or the possibility of water splashing. [. . . ] The installation to the vehicle should securely fasten the unit to a place in which it will not obstruct driving. If the unit comes off due to a shock and hits a person or safety part, it may cause injury or an accident. After installing the unit, check to make sure that electrical equipment such as the brake lamps, turn signal lamps and windshield wipers operate normally. Adjust this control according to the pre-out level of the center unit connected to this amplifier. Refer to "Specifications" on the center unit's instruction manual about the pre-out level. This control adjusts the frequency band output from this unit. When this switch is set to "-6dB"/"-12dB", frequencies in the band set with the B. The band rejection allows to reduce resonance inside the vehicle compartment and standing waves. Every time the button is pressed, 7 fixed colors and the variable color change. The color can't be set when the indicator is blinking. When this switch is set to "ON", the inaudible, ultralow frequencies below the frequency set with the 15Hz/25Hz switch are cut off. Since there are large variety of settings and connections possible according to applications, read the instruction manual well to select the proper setting and connection. Remove the ignition key and disconnect the negative - terminal of the battery to prevent short circuits. Connect the power wire, power control wire and grounding wire following this order. If sound is not output normally, immediately turn power off and check connections. Be sure to turn the power off before changing the setting of any switch. If the fuse blows, check wires for shorts, then replace the fuse with one of the same rating. Do not remove caps from unconnected wires or connectors to prevent short circuits. Sharing the negative wire of the speaker or grounding speaker wires to the metal body of the car can cause this unit to fail. After installation, check that the brake lamps, winkers, and wipers work properly. As this unit accepts speakers with a minimum impedance of 1 ohm, connect speakers with 1-ohm or higher impedance to these terminals. The rated input of the speakers should be no less than the maximum output of the amplifier. [. . . ] ) · When more than one power amplifier are going to be used, use a power supply wiring wire and protective fuse of greater current-handling capacity than the total maximum current drawn by each amplifier. While pressing the lock release button with a slotted screwdriver, insert the wire. The rated input power of the speakers that are going to be connected should be greater than the maximum output power (in Watts) of the amplifier. Use of speakers having input power ratings that are less than the output power of the amplifier will cause smoke to be emitted as well as damage. [. . . ]