User manual KENWOOD KAC-6404

[. . . ] If the front panel gets dirty, turn off the power and wipe the panel with a dry silicon cloth or soft cloth. 2 CAUTION 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. 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. [. . . ] This switch allow filtering of the speaker output signals. 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. Only frequencies of 80 Hz or higher are output. This switch allow filtering of the speaker output signals. The filter outputs the band of lower frequencies than the frequency set with the "LPF 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. 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. Do not turn the power on if the ground wire is not connected. ⷠBe sure to install a protective fuse in the power cord near the battery. 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. If sound is not output normally, immediately turn power off and check connections. [. . . ] These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment may cause harmful interference to radio communications, if it is not installed and used in accordance with the instructions. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one or more of the following measures: · Connect the equipment into an outlet on a circuit different from that to which the receiver is connected. [. . . ]