User manual KENWOOD KAC-646

[. . . ] Use it after starting the engine. Protection function There is a Protection function installed in the unit to protect the unit and speakers from various problems. (Refer to page 5) Accessories Part name Self-tapping screws (ø4 × 16 mm) Terminal cover (Power terminal) Speaker level input cable External View Number of Items 4 1 1 2 English Installation 330 mm 204 mm Ø4. 6 Self-tapping screw (ø4 × 16 mm) 230 mm 244 mm 254 mm Installation board, etc. (thickness : 15 mm or more) 2 CAUTION · Do not install in the below locations; (Unstable location, In a location that interferes with driving, In a location that gets wet, In a dusty location, In a place that gets hot, In a place that gets direct sunlight, In a location that gets hit by hot air) · Do not install the unit under the carpet. · Install this unit in a location which allows heat to easily dissipate. [. . . ] · 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. English 3 Controls / Indicator 4 40 30 20 10 (W) 1 2 3 4 1 A ch FILTER switch This switch allow filtering of the speaker output signals. 4 INPUT SENSITIVITY control (A. ch/ B. ch) 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 genuineaccessory car stereo. The sensitivities of amplifiers A and B can be adjusted independently regardless of the position of the input selector switch. NOTE For the pre-output level or the maximum power output, refer to the <Specifications> in the instruction manual of the center unit. · OFF position: The original sound without filtering is output. · HPF (High Pass Filter) position: Only frequencies of 80 Hz or higher are output. (Frequencies below 80 Hz are cut. ) 2 B ch FILTER switch This switch allow filtering of the speaker output signals. · OFF position: The original sound without filtering is output. · LPF (Low-Pass Filter) position: Only frequencies of 80 Hz or lower are output. (Frequencies above 80 Hz are cut. ) The speaker output is automatically turned monaural (L+R) and the bass boost function is activated. 3 INPUT SELECTOR switch This switch selects the input method of the signals to be amplified by amplifiers A and B. · A B position: Amplifies both of the signals input to amplifiers A and B. · A position: Amplifies only signal input amplifier A with both amplifiers A and B. 4 English 5 5 Power indicator When the power is turned on, the Power indicator lights. 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. The protection function is activated in the following situations: 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. · When the unit malfunctions and a DC signal is sent to the speaker output. 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. Wiring · Take the battery wire for this unit directly from the battery. If it's connected to the vehicle's wiring harness, it can cause blown fuses etc. · 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 install a protective fuse in the power cord near the battery. The protective fuse should be the same capacity as the unit's fuse capacity or somewhat larger. · For the power cord and ground, use a vehicle type (fireproof ) power wring cord with a current capacity greater than the unit's fuse capacity. (Use a power wiring cord with a diameter of 5 mm² (AWG 10) or greater. ) · 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. Speaker selection · 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. [. . . ] (Low pass) Capacitor (C): Passes high frequencies and blocks low frequencies. (High pass) L= 159 x R (mH) fc Frequency 159000 C= (F) fc × R fc=Cut of Frequency (Hz) R=Speaker Impedance () Example: When it is required to set a crossover frequency of 120 Hz using speakers with an impedance of 4 ohms. Prepare commercially-available coil and capacitor with the closest ratings to the results calculated from the formula above. The capacitor rating should be as close as possible to 331. 25 (F) and the coil rating should be as close as possible to 5. 3 (mH). [. . . ]