User manual KENWOOD KAC-X542

[. . . ] 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. 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. [. . . ] This unit is compatible with a large variety of systems by combining the switches and functions described in the following. The filter outputs the band of higher frequencies than the frequency set with the FILTER FREQUENCY 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 entire bandwidth is output without filtering. The filter outputs the band of lower frequencies than the frequency set with the FILTER FREQUENCY control. The amplification methods of the signals input to amplifiers A and B can be selected independently according to the setting of this switch. For the pre-output level or the maximum power output, refer to the "Specifications" in the instruction manual of the center unit. The amplifier can be used as a stereo amplifier. You can use the BASS BOOST for amplifier B only. 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. Do not connect cables and leads to both RCA cable input jacks and the speaker level input terminals simultaneously, for this may cause malfunction or damage. Connect the power control lead to a power supply which can be turned ON/OFF by the ignition key switch (ACC line). With this connection, shock noise may be generated when the power of the genuine-accessory car stereo is switched ON/OFF. The rated input of the speakers should be no less than the maximum output of the Since there are large variety of settings and connections possible according to applications, read the instruction manual well to select the proper setting and connection. 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. 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. [. . . ] The capacitor rating should be as close as possible to 331. 25 (µF) and the coil rating should be as close as possible to 5. If you wish to bridge-connect a speaker, the speaker impedance must be no less than 4 ohms. Connecting a speaker with an impedance lower than 4 ohms may damage the unit. [. . . ]