Kenwood KAC-M645 Car Amplifier User Manual
Contents
1. KENWOOD 4 3 2 CHANNEL POWER AMPLIFIER KAC M845 KAC M645 INSTRUCTION MANUAL Kenwood Corporation B64 3924 00 00 MV Safety precautions 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 mm 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 he unit If the unit starts to emit smoke or strange smells urn off the power immediately and consult your enwood 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 safety s sake leave the mounting and wiring work to professionals ACAUTION 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 malfunc2. ain so that it is not pinched by anything Set switches properly by referring to lt Controls gt Specifications esoessoesoessoesoesseessesseesee 845 arm 720 W 180 W x 4 Audio Section ax Power Output Rated Power Output Signal to Noise Ratio nput Impedance General Operating Voltage Current Consumption Dimensions W x H x D sl Normal 4 20 Hz 20 kHz 1 THD Normal 2 1 kHz 1 THD Bridged 4 1 kHz 1 THD Frequency Response 0 3 dB Sensitivity rated output Low Pass Filter Frequency 12 dB oct High Pass Filter Frequency 12 dB oct Specifications subject to change without notice 8 English 845 14 4 V 11 16 V allowable eee 30 19 m g 330 x 59 x 230 m 422 9 KAC M645 500 W 125 W x 4 40W x4 60 W x 4 130 W x 2 5 Hz 50 kHz 02V 50V 94 dB 10 kQ 50 200 Hz variable 80 Hz KAC M645 144V 11 16 V allowable 330 x 59 x 230 mm 2 7 kg
3. e emitted as well as damage The impedance of the speakers that are going to be connected should be 20 or greater for stereo connections or 40 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 Combined impedance English 5 Connection E RCA cable or Speaker level input connection RCA cable connections RCA cable CENTER UNIT hd CD receiver etc Power control wire Blue White A channel input channel input Speaker level input connections A channel 16 Ac Rig Ba Le Bd Purple Black Genuine accessory car stereo No line output center unit Battery Do not connect cables and leads to both cable input jacks and the speaker level input erminals 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 he ignition key switch ACC line With this connection pop noise may be generated when he power of the genuine accessor
4. eiver etc or this unit is not connected to a metal part serving as an electrical ground passing electricity to the battery s negative terminal Installation 330 mm 236 mm 04 6 218 4 mm 230 mm Self tapping screw 04 16 mm Cooling fan Cooling fan 845 845 Installation board etc thickness 15 mm or more Accessories Number of Items External Part name View Self tapping screws gt 04 X 16 mm 2 Terminal cover Power terminal Speaker level input cable VOT A 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 objec 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 fa
5. erminal Terminal cover Power control wire Ground wire Z7 pA Protective Fuse Battery wire Battery English 7 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 No sound No sound from one side Blown fuse POSSIBLE CAUSE Input or output cables are disconnected Protection circuit may be activated Volume is too high he speaker cord is shorted SOLUTION Connect the input or output cables Check connections by referring to lt Protection function gt 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 s not set to the correct position Adjust the control correctly referring to lt Controls gt The sound quality is bad The sound is distorted The speakers wire are connected with wrong polarity A speaker wire is pinched by a screw n the car body The switches may be set improperly Connect them properly checking the of the terminals and wires well Connect the speaker wire ag
6. ible according to applications read the instruction manual well to select the proper setting and connection 1 AWN Remove the ignition key and disconnect the negative terminal of the battery to prevent short circuits Set the unit according to the intended usage Connec Connec Connec the input and output wires of the units the speaker wires the power wire power control wire and grounding wire following this order Install the installation fittings in the unit 7 8 WARNING Attach the unit Connect the negative terminal of the battery To prevent fire caused by a short in the wiring connect a usible link or breaker nearby the battery s positive terminal CAUTION f 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 f the fuse blows check wires for shorts then replace he fuse with one of the same rating Check that no unconnected wires or connectors are ouching 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 E Wiri
7. n 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 on top of the English 3 Controls Ach FILTER B ch FILTER OFF HPE OFF LPF a 4 100 a a a a MNS O D 2IMAX MNE 2 soo Ach 8 INPUT SENSTIVTY V 0 o B FREGUENOVTHE 40W a MIN S 2 Ach FILTER switch This switch allow filtering of the speaker output signals OFF position The original
8. ng E Speaker selection 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 he 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 he 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 The protective fuse should be the same capacity as the 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 mm 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 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 b
9. sound without filtering is output HPF High Pass Filter position Only freguencies of 80 Hz or higher are output Freguencies below 80 Hz are cut 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 freguencies than the freguency set with the LPF FREOUENCY control The speaker output is automatically turned monaural L R and the gain is enhanced 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 English B ch LPF FREQUENCY control Sets the cutoff frequency when the B ch FILTER switch is set to LPF 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 lt Protection function gt page 2 Connection Installation procedure Since there are large variety of settings and connections poss
10. tion 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 2 English 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 A 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 won t operate When a ground wire of the center unit cassette receiver CD rec
11. y 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 20 or greater When multiple speakers are to be connected ensure that the 6 English ACC combined impedance is 20 or greater for each channel Bridged Connections Make connections to the LEFT channel and the RIGHT channel SPEAKER OUTPUT terminals The speakers to be connected should have an impedance of 40 or greater When multiple speakers are to be connected ensure that the combined impedance is 40 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 x 1 KAC M645 25 A x 1 Commercially available parts E Speaker wire connection Stereo Connections o A channel 2 Left speaker channel Lead terminal o o Right speaker gt channel Right speaker OR B channel S Left speaker A channel Speaker Bridged Bridged Connections B channel Speaker Bridged E Power wire connection KAC M645 U Fusetesa Fustieca ar GND sow Sure a EMN i gn he 111 9 sz KAC M845 Lead t
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