User manual KENWOOD KAC-646

[. . . ] They can scratch the surface of the panel and/or cause the indicator letters to peel off. To prevent battery rise When the unit is used in the ACC ON position without turning the engine ON, it depletes the battery. 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. When Protection operates, the indicator informs you of the condition. (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. [. . . ] · 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. Use the diagram on the right as a guide. 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 a speaker wire may be short-circuited. · When a speaker output contacts ground. · Be sure to turn the power off before changing the setting of any switch. · If the fuse blows, check wires for shorts, then replace the fuse with one of the same rating. · Check that no unconnected wires or connectors are touching the car body. Do not remove caps from unconnected wires or connectors to prevent short circuits. · Connect the speaker wires to appropriate speaker connectors separately. 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. [. . . ] (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). [. . . ]