? b64-3924-00/00 (mv) 4/3/2 channel power amplifier kac-m845 KAC-M645 instruction manual # @ @ . @ & o h m j t i j o e e # @ @ . @ & o h m j t i j o e e " . " . www..net
2 english safety precautions 2 warning to prevent injury or fire, take the following precautions: ? when extending the ignition, battery, or ground wires, make sure to use automotive-grade wires or other wires with a 5 mm2 (awg 10) or more to prevent wire deterioration and damage to the wire coating. ? to prevent a short circuit, never put or leave any metallic objects (such as coins or metal tools) inside the unit. ? if the unit starts to emit smoke or strange smells, turn off the power immediately and consult your kenwood dealer. ? do not touch the unit during use because the surface of the unit becomes hot and may cause burns if touched. ? mounting and wiring this product requires skills and experience. for safetys sake, leave the mounting and wiring work to professionals. 2 caution 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 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. ? when replacing a fuse, only use a new one with the prescribed rating. using a fuse with the wrong rating may cause your unit to malfunction. ? to prevent a short circuit when replacing a fuse, first disconnect the wiring harness. note ? if you experience problems during installation, consult your kenwood dealer. ? if the unit does not seem to be working right, consult your kenwood dealer. to prevent battery from running out 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. cleaning the unit 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. protection function 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. ? when the unit malfunctions and a dc signal is sent to the speaker output. ? when the internal temperature is high and unit wont 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. # @ @ . @ & o h m j t i j o e e # @ @ . @ & o h m j t i j o e e " . " . www..net
english 3 installation 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. otherwise heat build-up occurs and the unit may be damaged. ? install this unit in a location which allows heat to easily dissipate. once installed, do not place any object on top of the unit. ? 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. ? this unit has cooling fan to decrease the internal temperature. do not mount the unit in a place where the cooling fan and ducts of the unit are blocked. blocking these openings will inhibit the cooling of the internal temperature and result in malfunction. ? when making a hole under a seat, inside the trunk, or somewhere else in the vehicle, check that there is nothing hazardous on the opposite side such as a gasoline tank, brake pipe, or wiring harness, and be careful not to cause scratches or other damage. ? do not install near the dashboard, rear tray, or air bag safety parts. ? the installation to the vehicle should securely fasten the unit to a place in which it will not obstruct driving. if the unit comes off due to a shock and hits a person or safety part, it may cause injury or an accident. ? after installing the unit, check to make sure that electrical equipment such as the brake lamps, turn signal lamps and windshield wipers operate normally. installation board, etc. (thickness : 15 mm or more) self-tapping screw (?4 16 mm) 330 mm 236 mm ?4.6 218.4 mm 230 mm accessories part name external view number of items self-tapping screws (?4 16 mm) 4 terminal cover (power terminal) 1 speaker level input cable 1 cooling fan (kac-m845) cooling fan (kac-m845) # @ @ . @ & o h m j t i j o e e # @ @ . @ & o h m j t i j o e e " . " . www..net
4 english controls s t p q r r 40w 15w 1 a ch filter switch this switch allow filtering of the speaker output signals. ?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: the filter outputs the band of lower frequencies than the frequency set with the "lpf frequency" control. the speaker output is automatically turned monaural (l+r) and the gain is enhanced. 3 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 genuine-accessory car stereo. use the diagram on the right as a guide. the sensitivities of amplifiers a and b can be adjusted independently. 4 b ch lpf frequency control sets the cutoff frequency when the "b ch filter" switch is set to "lpf". 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. refer to (page 2). # @ @ . @ & o h m j t i j o e e # @ @ . @ & o h m j t i j o e e " . " . www..net
english 5 connection installation procedure 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. 1. remove the ignition key and disconnect the negative - terminal of the battery to prevent short circuits. 2. set the unit according to the intended usage. 3. connect the input and output wires of the units. 4. connect the speaker wires. 5. connect the power wire, power control wire and grounding wire following this order. 6. install the installation fittings in the unit. 7. attach the unit. 8. connect the negative - terminal of the battery. 2 warning to prevent fire caused by a short in the wiring, connect a fusible link or breaker nearby the batterys positive terminal. 2 caution ? if sound is not output normally, immediately turn power off and check connections. ? 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 vehicles 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 batterys 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. the protective fuse should be the same capacity as the units 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 units 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 input power of the speakers that are going to be connected should be greater than the 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. 2 8 4 4 4 4 combined impedance # @ @ . @ & o h m j t i j o e e # @ @ . @ & o h m j t i j o e e " . " . www..net
6 english connection center unit (cd receiver, etc.) a channel input rca cable* power control wire (blue/ white) rca cable or speaker level input connection genuine-accessory car stereo (no line output center unit etc.) acc battery car fuse box ?rca cable connections ?speaker level input connections b channel input speaker level input cable note ? 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. speaker level input terminals ? the genuine-accessory car stereo shall have a maximum power output of no more than 40 w. ? 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, pop noise may be generated when the power of the genuine-accessory car stereo is switched on/off. speaker output terminals (a.ch/ b.ch) ? stereo connections: the speakers to be connected should have an impedance of 2 or greater. when multiple speakers are to be connected, ensure that the combined impedance is 2 or greater for each channel. ? bridged connections: make connections to the left channel 9 and the right channel speaker output terminals. the speakers to be connected should have an impedance of 4 or greater. when multiple speakers are to be connected, ensure that the combined impedance is 4 or greater. power control terminal controls the unit on/off. note controls the unit power. be sure to connect it with all the systems. fuse kac-m845: 40 a 1 KAC-M645: 25 a 1 cable color of the connector a channel left 9 white white/black a channel right 9 gray gray/black b channel left 9 green green/black b channel right 9 purple purple/black # @ @ . @ & o h m j t i j o e e # @ @ . @ & o h m j t i j o e e " . " . www..net
english 7 * commercially available parts ? speaker wire connection lead terminal* ?stereo connections a channel left speaker a channel right speaker ?bridged connections a channel speaker (bridged) 40 25 battery ground wire* battery wire* protective fuse* lead terminal* power wire connection terminal cover b channel left speaker b channel right speaker b channel speaker (bridged) power control wire* KAC-M645 kac-m845 # @ @ . @ & o h m j t i j o e e # @ @ . @ & o h m j t i j o e e " . " . www..net
8 english troubleshooting guide what might appear to be a malfunction in your unit may just be the result of slight misoperation or miswiring. before calling service, first check the following table for possible problems. problem possible cause solution no sound. (no sound from one side.) (blown fuse.) ? input (or output) cables are disconnected. ? protection circuit may be activated. ? volume is too high. ? the speaker cord is shorted. ? connect the input (or output) cables. ? check connections by referring to . ? replace the fuse and use lower volume. ? after check the speaker cord and fixing the cause of the short, replace the fuse. the output level is too small (or too large). ? the input sensitivity adjusting control is not set to the correct position. ? adjust the control correctly referring to . the sound quality is bad. (the sound is distorted.) ? the speakers wire are connected with wrong 9 / polarity. ? a speaker wire is pinched by a screw in the car body. ? the switches may be set improperly. ? connect them properly checking the 9 / of the terminals and wires well. ? connect the speaker wire again so that it is not pinched by anything. ? set switches properly by referring to . specifications audio section ...................................................................... kac-m845 KAC-M645 max power output .....................................................................................720 w (180 w 4) 500 w (125 w 4) rated power output normal (4 ) (20 hz C 20 khz, 1 % thd) ............................................... 60 w 4 40 w 4 normal (2 ) (1 khz, 1 % thd).................................................................... 90 w 4 60 w 4 bridged (4 ) (1 khz, 1 % thd).................................................................180 w 2 130 w 2 frequency response (+0, C3 db) ....................................................................5 hz C 50 khz 5 hz C 50 khz sensitivity (rated output) ........................................................................................0.2 v C 5.0 v 0.2 v C 5.0 v signal to noise ratio ......................................................................................................... ......94 db 94 db input impedance ............................................................................................................... ...... 10 k 10 k low pass filter frequency (-12 db/oct.).....................................50 C 200 hz (variable) 50 C 200 hz (variable) high pass filter frequency (-12 db/oct.) ......................................................................80 hz 80 hz general ................................................................................ kac-m845 KAC-M645 operating voltage .................................................................... 14.4 v (11 C 16 v allowable) 14.4 v (11 C 16 v allowable) current consumption ........................................................................................................... ...36 a 19 a dimensions (w h d) .......................................................................330 59 230 mm 330 59 230 mm weight ........................................................................................................................ ...................2.9 kg 2.7 kg ? specifications subject to change without notice. # @ @ . @ & o h m j t i j o e e # @ @ . @ & o h m j t i j o e e " . " . www..net
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