User manual KENWOOD KAC-744

[. . . ] · A speaker wire is pinched by a screw in the car body. · The switches may be set improperly. INSTRUCTION MANUAL Specifications Specifications subject to change without notice. Audio Section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . KAC-744 Max Power Output (4 ½) 4 Channel Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100 W ´ 4 3 Channel Mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100 W ´ 2 + 300 W ´ 1 2 Channel Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 300 W ´ 2 Rated Power Output (4 ½) 4 Channel Mode (20 Hz ~ 20 kHz, less than 0. 08 % THD). . . . . 50 W ´ 4 4 Channel Mode (DIN45324, +B=14. 4V) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50 W ´ 4 3 Channel Mode (20 Hz ~ 20 kHz, 0. 08 % THD) + (1 kHz, 0. 8 % THD) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50 W ´ 2 + 150 W ´ 1 2 Channel Mode (1 kHz, 0. 8 % THD). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 150 W ´ 2 Rated Power Output (2 ½) 4 Channel Mode (1 kHz, 0. 8 % THD). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75 W ´ 4 Frequency Response (+0, ­3 dB) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Hz ~ 50 kHz Signal to Noise Ratio . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100 dB Sensitivity (MAX) (rated output). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0. 2 V Sensitivity (MIN) (rated output). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5. 0 V Input Impedance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 k½ Low Pass Filter Frequency (12 dB/oct. ) (Variable) . . . . . . . . . . . . . . . . 50 ~ 200 Hz High Pass Filter Frequency (12 dB/oct. ) (Variable). . . . . . . . . . . . . . . . 50 ~ 200 Hz Bass Boost Circuit (90 Hz) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 dB KAC-749S 80 W ´ 4 80 W ´ 2 + 250 W ´ 1 250 W ´ 2 40 W ´ 4 40 W ´ 4 40 W ´ 2 + 120 W ´ 1 120 W ´ 2 60 W ´ 4 5 Hz ~ 50 kHz 100 dB 0. 2 V 5. 0 V 10 k½ 50 ~ 200 Hz 50 ~ 200 Hz 6 dB Take the time to read through this instruction manual. Familiarity with installation and operation procedures will help you obtain the best performance from your new power amplifier. For your records General. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . KAC-744 Operating Voltage (11 ~ 16 V allowable) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14. 4 V Current Consumption (1 kHz, 10 % THD) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31 A Dimensions (W ´ H ´ D) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 261 ´ 57 ´ 256 mm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . (10-1/4´2-1/4´10-1/16 in. ) Weight. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3. 5 kg (7. 7 lb) KAC-749S 14. 4 V 26 A 261 ´ 57 ´ 256 mm (10-1/4´2-1/4´10-1/16 in. ) 3. 5 kg (7. 7 lb) Record the serial number, found on the back of the unit, in the spaces designated on the warranty card, and in the space provided below. [. . . ] Remove the ignition key and disconnect the negative - terminal of the battery to prevent short circuits. Set the unit according to the intended usage. Connect the input and output cables of the units. 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 open the top or bottom covers of the unit. Otherwise heat build-up occurs and the unit may be damaged. · Install this unit in a location which allows heat to easily dissipate. Once installed, do not place any object on top of the unit. · The surface temperature of the amplifier will become hot during use. 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. [. . . ] 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. The sensitivities of amplifiers A and B can be !Speaker level input terminals @ BASS BOOST switch When the switch is in "ON" position, the bass is boosted by 6 dB. [. . . ]