User manual KENWOOD KAC-648

[. . . ] · If the unit does not seem to be working right, consult your Kenwood dealer. 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. Accessories Part name Round terminal (Large) Round terminal (Medium) Round terminal (Small) Terminal cover (Power terminal) Self-tapping screws (ø4 × 16 mm) External View Number of Items 1 2 1 1 4 Protection function This unit is equipped with a protection function for protecting this unit and your speakers from various accidents or problems that can occur. When the protection function is triggered, the Power indicator goes off and the amplifier stops operating. s Power indicator: When the power is turned on, the Power indicator lights. [. . . ] · 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. 3 Controls 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. This unit is compatible with a large variety of systems by combining the switches and functions described in the following. 5 SPEAKER LEVEL INPUT LEFT RIGHT A SPEAKER LEVEL INPUT A B B B L R FUSE(25A) BATT POWER IN SPEAKER OUTPUT BRIDGED GND 25 LEFT RIGHT A P. CON(REMOTE) 1 234 8 6 90! 7 FILTER OPERATION MONO(Lch) 1. 0 OFF STEREO HPF LPF INPUT SELECTOR AB A 0. 5 LINE IN A B LINE OUT A+B 1. 0 OPERATION STEREO (Lch) MONO FILTER OFF HPF LPF MONO L L GND 0. 3 MIN MAX MIN 0. 5 0. 3 MAX INPUT SENSITIVITY(V) CONTROL A R R INPUT SENSITIVITY(V) CONTROL B 4 CHANNEL POWER AMPLIFIER mA @ # $ % mA 1 Fuse (25 A × 1) 2 Battery terminal 3 Ground terminal 4 Power control (REMOTE) terminal 5 Amplifier A speaker output terminals 6 Amplifier B speaker output terminals ySPEAKER OUTPUT terminals · Stereo Connections: When you wish to use the unit as a stereo amplifier, stereo connections are used. The speakers to be connected should have an impedance of 2 or greater. When multiple speakers are to be connected, ensure that the combined impedance is 2 or greater for each channel. When multiple speakers are to be connected, ensure that the combined impedance is 4 or greater. 2CAUTION The rated input of the speakers should be no less than the maximum output of the amplifier. Otherwise malfunction may result. 7 Speaker level input terminals 8 INPUT SELECTOR switch This switch selects the input method of the signals to be amplified by amplifiers A and B. AB A INPUT SELECTOR · A B position: Amplifies both of the signals input to amplifiers A and B. · Bridged Connections: When you wish to use the unit as a highoutput monaural amplifier, bridged connections are used. (Make connections to the LEFT channel (+) and the RIGHT channel (­) SPEAKER OUTPUT terminals. ) The speakers to be connected should have an impedance of 4 or greater. · A position: Amplifies only signal input amplifier A with both amplifiers A and B. 9 Amplifier A LINE IN terminal 0 Amplifier B LINE IN terminal 4 !LINE OUT terminal These jacks output respectively the signals input to amplifiers A and B. They always output the stereo signals regardless of the position of the OPERATION switch. independently according to the setting of this switch. · STEREO position: The amplifier can be used as a stereo amplifier. @ RCA cable ground lead terminal # 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 adjusted independently regardless of the position of the input selector switch. Use the diagram on 15 10 1. 0 the right as a guide. 1. 0 · MONO (Lch) position: Amplifies the signal input from the left side only. Set to this position and make bridged connections to use as a high-power monaural amplifier. (The input right signal is not output. ) % FILTER switch These switches allow filtering of the speaker output signals. · HPF(High Pass Filter) position: Only frequencies of 150Hz or higher are output. [. . . ] The input sensitivity adjusting control is not set to the correct position. · The speakers cable are connected with wrong + / polarity. · A speaker cable is pinched by a screw in the car body. · The switches may be set improperly. [. . . ]