User manual KENWOOD KAC-742

[. . . ] Model KAC-742 Serial number © PRINTED IN USA B64-1964-00 (KM/EM) Safety precautions 2WARNING s Wiring · If a buzzing noise is heard from the speakers when the engine is running, connect a line noise filter (optional) to each of the battery wire. · Do not allow the wire to directly contact the edge of the iron plate by using Grommets. · Connect the ground wire to a metal part of the car chassis that acts as an electrical ground passing electricity to the battery`s negative terminal. · Be sure to attach a protective fuse into the battery wire close to the battery. [. . . ] Connect the power wire, power control wire and grounding wire following this order. Turn power ON and ensure that sound is output normally. 2WARNING s Accessories Part name Terminal cover (Power terminal) Self-tapping screws (ø4 ´ 16 mm) External View Number of Items 1 4 To prevent injury or fire, take the following precautions: · When extending the ignition, battery, or ground wires, make sure to use automotive-grade wires or other wires with a 5mm2 (AWG10) or more to prevent wire deterioration and damage to the wire coating. · To prevent a short circuit, never put or leave any metallic objects (such as coins or metal tools) inside the unit. · If the unit starts to emit smoke or strange smells, turn off the power immediately and consult your Kenwood dealer. · Do not touch the unit during use because the surface of the unit becomes hot and may cause burns if touched. 2CAUTION Installation Since the power amplifier has no parts which require operation, it can be installed at a position away from the driver's seat without any hindrances. As generally accepted positions for its installation, places such as inside the trunk, etc. can be considered. 2CAUTION 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 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. · When replacing a fuse, only use a new one with the prescribed rating. Using a fuse with the wrong rating may cause your unit to malfunction. 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. (thickness : 15 mm or more) s Cleaning the unit If the front panel gets dirty, turn off the power and wipe the panel with a dry silicon cloth or soft cloth. 2CAUTION Do not wipe the panel with a hard cloth or a cloth dampened by volatile solvents such as paint thinner and alcohol. They can scratch the surface of the panel and/or cause the indicator letters to peel off. 8½ 2½ Controls 0 FUSE (30A) POWER IN BATT 10 0. 5 1 2 3 4 0. 3 SUBWOOFER AMPLIFIER · SERVO II P. CON(REMOTE) SPEAKER OUTPUT · SERVO II 15Hz OFF 25Hz OFF 6dB 12dB LINE IN 120 150 1 170 2 3 4 0. 5 0. 3 SPEAKER LEVEL INPUT LEFT R RIGHT 30 GND INFRASONIC BASS BOOST 100 70 50 L GND 200 5 0. 2 SUBWOOFER AMPLIFIER 15 LPF FREQUENCY(Hz) INPUT SENSITIVITY(V) 1 23 4 5 6 15Hz OFF 25Hz OFF 6dB 12dB 120 100 70 150 1 170 50 200 2 3 4 0. 5 0. 3 !@ # 5 (V) 0. 2 KAC-742 INFRASONIC BASS BOOST 5 0. 2 (W) MAXIMUM POWER LPF FREQUENCY(Hz) INPUT SENSITIVITY(V) 25W or greater Do not use this terminal for power source grounding. This unit will be damaged if the power source grounding wire is connected to this terminal. Power indicator · A speaker wire may be short-circuited. · When the internal temperature is high and unit won't operate. · The unit may be malfunctioning and sending DC signal to the speaker output. · The grounding wire of this unit may not be connected with a metallic part which is electrically connected with the negative terminal of the battery. · The grounding wire of the centre unit (cassette receiver, CD receiver, etc. ) may not be connected with a metallic part which is electrically connected with the negative terminal of the battery. 7 8 9 0 Operations of the following control and switches are required in accordance with the centre unit and speakers connected with this unit. 1 FUSE (30 A ´ 1) 2 Battery terminal 3 Ground terminal 4 Power control (REMOTE) terminal 5 Speaker output terminals As this unit accepts speakers with a minimum impedance of 2 ohms, connect speakers with 2-ohm or higher impedance to these terminals. 2CAUTION The rated input of the speakers should be no less than the maximum output of the amplifier. Setting this switch to "15 Hz" or "25 Hz" cuts the frequencies below the respective frequency. [. . . ] · If the Sigma servo terminals are not connected, the sound may fluctuate or noise may occur. · When connecting speakers in a parallel configuration, use speakers with an impedance of 4 ohms or more. Connecting speakers with smaller impedance than 4 ohms will cause malfunction. · The rated input of the speakers connected to this unit should be no less than the maximum output of the amplifier. [. . . ]