User manual KENWOOD KAC-744

[. . . ] Model KAC-744/749S Serial number © PRINTED IN USA B64-1969-00 (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. [. . . ] · 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. Installation procedure 1. 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. Connect the negative - terminal of the battery. 2WARNING s Accessories Part name Terminal cover (Power terminal) Self-tapping screws (ø4 ´ 16 mm) Speaker level input cable External View Number of Items 1 4 1 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 fire caused by a short in the wiring, connect a fusible link or breaker nearby the battery's positive terminal. 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. Install the amplifier in a place where people, resins, and other substances that are sensitive to heat will not come into contact with it. · When making a hole under a seat, inside the trunk, or somewhere else in the vehicle, check that there is nothing hazardous on the opposite side such as a gasoline tank, brake pipe, or wiring harness, and be careful not to cause scratches or other damage. · Do not install near the dashboard, rear tray, or air bag safety parts. · 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. Self-tapping screw (ø4 ´ 16 mm) 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 s Power terminal (234) Connect to their respective terminals the power supply wire, and ground wire, all of which pass through the associated terminal cover. Once the connections are complete, place the cover on the terminal section. 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 Installation board, etc. SPEAKER P. CON OUTPUT BRIDGED LEFT BASS BOOST(B. CH) OFF ON A. CH OFF HPF LPF FILTER B. CH OFF HPF LPF OPERATION A. CH STEREO MONO(Lch) GND RIGHT A B. CH 80 INPUT SELECTOR A LINE IN A B STEREO MONO(Lch) A B LINE OUT A+B 1 2 SPEAKER LEVEL INPUT A B 40 0. 5 25 0. 3 0. 2(MAX) 1 2 3 4 0. 5 0. 3 2 3 4 1 0. 5 0. 3 100 80 80 150 100 150 100 80 150 100 L GND 150 B POWER AMPLIFIER (MIN)5 0. 2(MAX) A. CH (MIN)5 0. 2(MAX) B. CH INPUT SENSITIVITY(V) 50 LPF 200 50 LPF 200 50 HPF 200 50 HPF 200 B. CH A. CH FILTER FREQUENCY(Hz) R L R 3 4 (MIN)5 15 10 (W) 1 2 34 This is a 4 channel amplifier including 2 stereo amplifiers in a body. One amplifier is referred to as amplifier A and the other is amplifier B. [. . . ] If the Power indicator does not light when the power is turned on, the protection function may be activated. Check whether there is any indication of trouble. 1 Fuse 40 A ´ 1 : KAC-744 30 A ´ 1 : KAC-749S NOTE For the pre-output level or the maximum power output, refer to the "Specifications" in the instruction manual of the center unit. 7 FILTER FREQUENCY control When the FILTER switch is set to the HPF (HighPass Filter) or LPF (Low-Pass Filter) position, the threshold frequency can be adjusted with this control. · OFF position: The entire bandwidth is output without filtering. · LPF (Low-Pass Filter) position: The filter outputs the band of lower frequencies than the frequency set with the FILTER FREQUENCY control. Set to this position and make bridged connections to use as a high-power monaural amplifier. (The input right signal is not output. ) 6 INPUT SENSITIVITY control Set this control according to the pre-output level of the center unit connected with this unit, or to the maximum power output of the genuine-accessory car stereo. [. . . ]