User manual KENWOOD KAC-644

[. . . ] 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. [. . . ] · 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 2 40 30 20 10 (W) 1 2 1 FILTER switch This switch allow filtering of the speaker output signals. 3 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. · 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. 2 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 3 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 40 4 567 8 9 0 4 Fuse (40 A) 5 Battery terminal 6 Ground terminal 7 Power control terminal Controls the unit ON/OFF. Be sure to connect it with all the systems. 9 LINE IN terminal 0 Speaker level input terminals NOTE · The genuine-accessory car stereo shall have a maximum power output of no more than 40 W. · Do not connect the speaker output leads from a power amplifier (Optional) to the speaker level input terminals of this unit, for this may cause malfunction or damage. · 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. · 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) 9 RCA cable* CENTER UNIT (CD receiver, etc. ) Power control wire (Blue/ White) Left input Right input Speaker level input cable Genuine-accessory car stereo (No line output center unit etc. ) (Speaker level input Connections) Cable Color of the connector White Left White/Black Gray Right Gray/Black 0 Car fuse box Battery ACC 8 English * Commercially available parts Speaker wire connection (Stereo Connections) 8 Lead terminal* 8 Left speaker Right speaker (Bridged Connections) 8 Speaker (Bridged) Power wire connection 40 40 40 567 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 2-channel + Subwoofer system ¡ L L R Left speaker Right speaker CENTER UNIT R L R L R Subwoofer (L + R) (Bridged) TM 1 ¡ TM 1 10 English Tri-mode L C L R L R CENTER UNIT (High pass) C Subwoofer (L + R) (Bridged) 1 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. [. . . ] 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. · Ensure that the withstand voltage and current ratings of the capacitors (C) and coils (L) are sufficient. English 11 Troubleshooting Guide What might appear to be a malfunction in your unit may just be the result of slight misoperation or miswiring. [. . . ]