User manual KENWOOD KAC-646X

[. . . ] (thickness : 15 mm or more) 2CAUTION · 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 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. [. . . ] · 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 3 40 30 20 10 (W) 1 2 3 4 1 FILTER switch This switch allows to apply high-pass or low-pass filtering to the speaker outputs. 4 OPERATION switch This switch is used to select the operation mode of the amplifier. · HPF (High-Pass Filter) position: The filter outputs the band of higher frequencies than the frequency set with the FILTER FREQUENCY control. · STEREO position: The amplifier can be used as a stereo amplifier. · 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. ) · OFF position: The entire bandwidth is output without filtering. · LPF (Low-Pass Filter) position: The filter outputs the band of lower frequencies than the frequency set with the FILTER FREQUENCY control. 2 FILTER FREQUENCY control Sets the cutoff frequency when the FILTER switch is set to LPF or HPF. 3 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 genuineaccessory car stereo. NOTE For the pre-output level or the maximum power output, refer to the <Specifications> in the instruction manual of the center unit. 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. · When the internal temperature is high and unit won't operate. · When a ground wire of the center unit (cassette receiver, CD receiver, etc. ) or this unit is not connected to a metal part serving as an electrical ground passing electricity to the battery's negative - terminal. English 5 Connection Terminal names 6 78 9 25 0 ! @# 6 Fuse (25 A) 7 Battery terminal 8 Ground terminal 9 Power control terminal Controls the unit ON/OFF. Be sure to connect it with all the systems. @ RCA cable ground lead terminal When using an RCA cable with a ground lead attached, connect the ground lead to this terminal. # Speaker level input terminals NOTE · The genuine-accessory car stereo shall have a maximum power output of no more than 40 W. · 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. 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. · The impedance of the speakers that are going to be connected should be 2 or greater (for stereo connections), or 4 or greater (for bridged connections). When more than one set of speakers are going to be used, calculate the combined impedance of the speakers and then connect suitable speakers to the amplifier. 4 4 4 4 8 2 Combined impedance English 7 Connection RCA cable or Speaker level input connection (RCA cable Connections) ! RCA cable* CENTER UNIT (CD receiver, etc. ) @ Power control wire (Blue/ White) @ D GN Left input Right input RCA cable ground terminal Speaker level input cable (Speaker level input Connections) Cable Color of the connector White Left White/Black Gray Right Gray/Black Genuine-accessory car stereo (No line output center unit etc. ) # Car fuse box Battery ACC 8 English * Commercially available parts Speaker wire connection (Stereo Connections) 0 Lead terminal* 0 Left speaker Right speaker (Bridged Connections) 0 Speaker (Bridged) Power wire connection 25 25 25 789 Terminal cover Lead terminal* Power control wire Battery wire* Ground wire* Protective Fuse* Battery English 9 System examples 2-channel system CENTER UNIT L R L R Left speaker Right speaker 1 4 High-power 2-channel system ¡ L L R L R L R Left speaker (Bridged) CENTER UNIT R L R Right speaker (Bridged) TM ¡ TM 1 4 2-channel + Subwoofer system ¡ L L R Left speaker (High pass) Right speaker (High pass) CENTER UNIT R L R L R Subwoofer (L + R) (Bridged) TM 1 2 4 ¡ TM 1 2 4 10 English Tri-mode L C L R L R CENTER UNIT (High pass) C Subwoofer (L + R) (Bridged) 1 4 Principle of Tri-mode Method of frequency band division using a coil and capacitor. . . in case of 6dB/oct. slope Crossover Frequency 0 dB -3 dB L C Coil (L): Passes low frequencies and blocks high frequencies. (Low pass) Capacitor (C): Passes high frequencies and blocks low frequencies. [. . . ] 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. 3 (mH). 2CAUTION · 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. · Be sure to connect capacitors to speakers to which high frequencies will be passed. Failure to do so will result in a drop of the combined impedance with the subwoofer. [. . . ]