Kenwood KAC-849 Car Stereo System User Manual
Contents
1. Front right ooo Lead terminal ii Power control wire Ground wire T Aad Battery ET e Terminal cover Right Rear left Rear right Front Rear w D T w gt Ea Gal Ge Commercially available parts2. oct slope Coil L Passes low frequencies and blocks high frequencies Low pass Capacitor C Passes high frequencies and blocks low frequencies High pass Example When it is required to set a crossover frequency of 120 Hz using speakers with an impedance of 4 ohms fc Cut of Frequency Hz R Speaker Impedance Q Failur e 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 e Be sure to connect capacitors to speakers to which high frequencies will be passed e to do so will result in a drop of the combined impedance with the subwoofer e Ensure that the withstand voltage and current ratings of the capacitors C and coils L are sufficient E Speaker stereo connection o WE e Power control wire A oyo BY VIO OOQ Battery wire Protective Fuse Lead terminal L __ T Battery Car fuse box E Speaker bridge connection A Bridge om Bridge Description of markings in the figure Left Front left
3. or this unit is not connected to a metal part serving as an electrical ground passing electricity to the battery s negative terminal Front left speaker Front right speaker Rear left speaker Rear right speaker CD receiver etc e Note For safe installation read Installation procedure before starting work E RCA cable connection CENTER UNIT Cassette receiver E Speaker level input connection Cable Color of the Genuine accessory car stereo No line Gray Black connector output center unit Whit etc Ite RCA cable x White Black Gray R Green ns Green Black Purple Gis Purple Black ht speaker Subwoofer BASS BOOST B CH Lead terminal 0 dB 3 dB Frequency OPERATION ACH FILTER B CH ae INPUT SELECTOR ee A Bass B00sTI cH C 159000 uF 2 159000 331 25 UF STEREO MONO Lch STEREO MONO Lch cy ae ee n fc xR 120Hz x 4Q uD aD am oo L 159 x R mH 159 x 40 53mH fe 120Hz Y Principle of Tri mode ACAUTION Method of frequency band division using a coil and capacitor in case of 6dB
4. 1 4x2 1 4x10 1 16 in Wedha e a a S 3 5 kg 7 7 Ib 3 5 kg 7 7 Ib F E Wirin Safety precautions eifa d noise is heard from the speakers AWARNING when the engine is running connect a line noise g g filter optional to each of the battery wire To prevent injury or fire take the following Do not allow the wire to directly contact the edge precautions of the iron plate by using Grommets e When extending the ignition battery or ground wires make sure to use automotive grade wires or other wires with a 5mm AWG10 or more to prevent wire deterioration and damage to the wire coating e To prevent a short circuit never put or leave any metallic objects such as coins or metal tools inside the unit e f the unit starts to emit smoke or strange smells turn off the power immediately and consult your Kenwood dealer e Do not touch the unit during use because the surface of the unit becomes hot and may cause burns if touched 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 e Do not open the top or bottom covers of the unit e 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 e When replacing a fuse only use a new one with the prescribed rating Using a fuse with the wrong rating may ca
5. 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 disconnected e Protection circuit may be activated Blown fuse e Volume is too high e The speaker cord is shorted The output level is too small or too large position The sound quality is bad The sound is distorted polarity e A speaker wire is pinched by a screw in the car body e The switches may be set improperly POSSIBLE CAUSE e Input or output cables are The input sensitivity adjusting control is not set to the correct e The speakers wire are connected with wrong SOLUTION e Connect the input or output cables e Check connections by referring to Power indicator e Replace the fuse and use lower volume e After check the speaker cord and fixing the cause of the short replace the fuse Adjust the control correctly referring to Controls e Connect them properly checking the of the terminals and wires well e Connect the speaker wire again so that it is not pinched by anything e Set switches properly by referring to System examples Specifications Specifications subject to change without notice Audio Section cre KAC 849 KAC 749S Max Power Out
6. eaker 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 e After installation check that the brake lamps winkers and wipers work properly E Speaker level input terminals 40 e The genuine accessory car stereo shall have a maximum power output of no more than 40 W e 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 e 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 e 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 shock noise may be generated when the power of the genuine accessory car stereo is switched ON OFF E Power terminal Connect to their respective terminals the power supply wire and ground wire all of which pass through the associated terminal cover Once the connections are complete place the cover on the terminal section E Accessories Number of Items External Part name fi View Terminal cover Power terminal Self tapping screws 94 x 16 mm D gt Speaker level input cable Installation Since the power am
7. ers A and B can be System examples E 4 channel E 4 channel a cH FILTER B cH OFF HPE LPE SY HPE LPr OFF ON Leo Cm E 100 EA asom 100 E aso mg a s0 m 50 LPF 200 50 LPF 200 A CH B CH FILTER FREQUENCY Hz E 3 channel Rig a cH F LTER B cH ac HPP LPF NS HPR LPF OFF ON m mM 100 8 150 gon 100 EA 150 gag a 80 30 50 LPF 200 50 LPF 200 A CH B CH FILTER FREQUENCY Hz E 2 channel A cH FILTER B cH a HPF LPF Cam 100 8250 gon a S0 LPE 200 HPE LPF OFF ON am Gi feo 100 150 Gag 80 50 so HPF 200 50 LPF 200 50 HPF 200 A CH i FILTER FREQUENCY Hz High pass o Subwoofer L R SS E a BASS BOOST B CH F ON Left speaker Left speaker Right speaker FF BASS BOOST B CH FILTER BCH OPERATION f i INPUT SELECTOR STEREO MONO Lch STEREO MONO Lch AB A uo qm OFF HPF LPF adjusted independently regardless of the position of the input selector switch Use the diagram on the right as a guide For the pre output level or the maximum power output refer to the Specifications in the instruction manual of the center unit FILTER FREQUENCY control When the FILTER switch is set to the HPF High Pass Filter or LPF Low Pass Filter position the threshold frequency ca
8. for the battery wire and the ground wire The current capacity of the power supply wiring wire should be about 10 A higher than that of the protective fuse capacity which means about 20 A higher than the maximum current drawn by the amplifier e 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 Example One Power Amplifier Is Used 31A 26A Maximum Current Drawn 50 Ax 1 25 Ax 2 Protective Fuse Cross sectional Area of 5 mm AWG 10 or Wiring Wire AWG greater x 1 nS 25 Al SS md 25A 25 A x A E Speaker Selection e 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 e The impedance of the speakers that are going to be connected should be 2Q or greater for stereo connections or 4Q 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 KENWOOD KAC 849 KAC 749S 4 CHANNEL POWER AMPLIFIER INSTRUCTION MANUAL KENWOOD CORPORATION TT CH01 Take the time to read th
9. ion The amplifier can be used as a stereo amplifier e 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 INPUT SELECTOR switch This switch selects the input method of the signals to be amplified by amplifiers A and B e AB position Amplifies both of the signals input to amplifiers A and B e A position KAC 849 Power indicator KAC 749S Amplifies only signal input amplifier A with both amplifiers A and B 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 e When a speaker wire may be short circuited e When a speaker output contacts ground e When the unit malfunctions and a DC signal is sent to the speaker output e When the internal temperature is high and unit won t operate e When a ground wire of the center unit cassette receiver CD receiver etc
10. n be adjusted with this control RCA cable ground lead terminal When using an RCA cable with a ground lead attached connect the ground lead to this terminal ACAUTION Do not use this terminal for power source grounding This unit will be damaged if the power source grounding wire is connected to this erminal Amplifier A B LINE IN terminals LINE OUT terminal These jacks output respectively the signals input to amplifiers A and B They always output the stereo signals regardless of the position of the OPERATION switch Speaker level input terminals BASS BOOST switch When the switch is in ON position the bass is boosted by 6 dB The bass boost applies only to the B amplifier Connection MIN 5 0 2 MAX INPUT SENSITIVITY V FILTER switch This switch allows to apply high pass or low pass filtering to the speaker outputs e HPF High Pass Filter position The filter outputs the band of higher frequencies than the frequency set with the FILTER FREQUENCY control e OFF position The entire bandwidth is output without filtering e LPF Low Pass Filter position The filter outputs the band of lower frequencies than the frequency set with the FILTER FREQUENCY control The speaker output is automatically turned monaural L R OPERATION switch The amplification methods of the signals input to amplifiers A and B can be selected independently according to the setting of this switch e STEREO posit
11. plifier has no parts which require operation it can be installed at a position away from the driver s seat without any hindrances As generally accepted positions for its installation places such as inside the trunk etc can be considered ACAUTION e Do not install the unit under the carpet Otherwise heat build up occurs and the unit may be damaged e Install this unit in a location which allows heat to easily dissipate Once installed do not place any object on top of the unit e The surface temperature of the amplifier will become hot during use Install the amplifier in a place where people resins and other substances hat are sensitive to heat will not come into contact with it e 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 he 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 e After installing the unit check to make sure that electrical equipment such as the brake lamps turn signal lamps and windshield wipers operate normally Self tapping sc
12. put 4 Q 4 Channel Mode ccccccccccccsccccsseeecssceeccsseeecseeeessseeeesaeeeen 100Wx4 80Wx4 3 Channel Mode 100Wx2 300Wx1 80Wx2 250Wx1 2 Channel Mode es ecsccncsccscsseiaonacsiesiaesyearconssaanaehiomtancataecteane 300Wx2 250Wx2 Rated Power Output 4 Q 4 Channel Mode 20 Hz 20 kHz less than 0 08 THD 50Wx4 40Wx4 DIN45324 B 14 4V ooo 50Wx4 40Wx4 3 Chann ode 20 Hz 20 kHz 0 08 THD 1 kHz 0 8 THD steak deceeteeeeeeeeueeeeeteeeetetseeettteeettee DOW X24 150Wx1 40Wx2 120Wx1 2 Channel Mode 1 kHz 0 8 THD 150W x2 120Wx2 Rated Power Output 2 Q 4 Channel Mode 1 kHz 0 8 THD 75Wx4 60Wx4 Frequency Response 0 3 dB 5 Hz 50 kHz Signal to Noise Ratio 0 100 dB Sensitivity MAX rated output 0 2V MIN rated OUT DUD isien naaa 50V 50V Inp t Impedanssi a nmi tesceaneties 10kQ 10kQ Low Pass Filter Frequency 12 dB oct Variable 200Hz 50 200 Hz High Pass Filter Frequency 12 dB oct Variable 50 200 Hz 50 200 Hz Bass Boost Circuit 90 HZ cccccccceceeeeseeeseeeneeeeeeeeeeeeeeeeteeeeeeeneees 6dB 6dB Germeral ooo ce eects cet eeeteteneeeeeteseseeaeees KAC 849 KAC 749S Operating Voltage 11 16 V allowable c cceeeeetteeeeeees 14 4V 144V Current Consumption 1 kHz 10 THD ccceeceeseeeeeeeteeeseeeees 31A 26A Dimensions W x H x D cecccsccccceceesssssseeeeeenssneees 261x57x256mm 261 x57 x 256 mm 10 1 4x2 1 4x10 1 16 in 10
13. rew 24 x 16 mm ioe _ amp Installation board etc ee P 2s thickness 15 mm or more Kf L Controls 40 i 0X25 3115 Ho w 2 0 3 4 A CH OFF BASS BOOST B CH OFF ON HPF LPF This is a 4 channel amplifier including 2 stereo amplifiers in a body One amplifier is referred to as amplifier A and the other is amplifier B This unit is compatible with a large variety of systems by combining the switches and functions described in the following Fuse 40 Ax 1 KAC 849 30 Ax 1 KAC 749S If you can t find the specified capacity fuse at your store etc consult your Kenwood dealer Battery terminal Ground terminal Power control terminal Amplifier A B SPEAKER OUTPUT terminals e Stereo Connections When you wish to use the unit as a stereo amplifier stereo connections are used e Bridged Connections When you wish to use the unit as a high output monaural amplifier bridged connections are used Make connections to the LEFT channel and the RIGHT channel SPEAKER OUTPUT terminals 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 genuine accessory car stereo The sensitivities of amplifi
14. rough this instruction manual Familiarity with installation and operation procedures will help you obtain the best performance from your new power amplifier For your records Record the serial number found on the back of the unit in the spaces designated on the warranty card and in the space provided below Refer to the model and serial numbers whenever you call upon your KENWOOD dealer for information or service on the product Model KAC 849 749S Serial number PRINTED IN USA B64 1969 00 KM EM Installation procedure 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 cables 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 unit in the car 7 Connect the negative terminal of the battery AWARNING To prevent fire caused by a short in the wiring connect a fusible link or breaker nearby the battery s positive terminal ACAUTION e Be sure to turn the power off before changing the setting of any switch e f the fuse blows check wires for shorts then replace the fuse with one of the same rating e Check that no unconnected cables or connectors are touching the car body Do not remove caps from unconnected cables or connectors to prevent short circuits e Connect the sp
15. use your unit to malfunction e To prevent a short circuit when replacing a fuse first disconnect the wiring harness e If you experience problems during installation consult your Kenwood dealer e f the unit does not seem to be working right consult your Kenwood dealer FCC WARNING This equipment may generate or use radio frequency energy Changes or modifications to this equipment may cause harmful interference unless the modifications are expressly approved in the instruction manual The user could lose the authority to operate this equipment if an unauthorized change or modification is made E 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 ACAUTION 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 e 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 e Be sure to attach a protective fuse into the battery wire close to the battery Use a protective fuse having a capacity that is about 10 A higher than the maximum current drawn by the amplifier e Use vehicle type fire resistant power supply wiring wire
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