Kenwood KAC-648 Stereo Amplifier User Manual
Contents
1. RCA cable ground 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 terminal Connection E Speaker level input connection Connect the unit by inserting it in the connection between the genuine accessory car stereo and speakers ACAUTION Do not connect cables and leads to both RCA cable input jacks and the speaker input terminals simultaneously for this may cause malfunction or damage To Power control Left input REMOTE terminal e Pi R SPEAKER OUTPUT e BRIDGED POWER IN SPEAKER LEVEL INPUT j pj SPS PSs ofelelo E IRINA peple Front Right Genuine accessory Front Left car stereo avy Base Lett 4 Rear Right Lead terminal Commercially available parts e e The genuine accessory car stereo shall have a maximum power output of no more than 25 W e Do not connect the speaker output leads from a power amplifier Optional to the speaker input terminals of this unit 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 genera2. e f the unit does not seem to be working right consult your Kenwood dealer 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 Accessories External Number of a o Round terminal Medium Round terminal Terminal cover Self tapping screws 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 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 E The protection function activates in the following situations e When a speaker cable may be short circuited e When a speaker output contacts ground e When the temperature of internal parts exceeds 120 C 248 F e When a ground cable 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 t
3. High pass Dm i UT ee CONTROL B FILTER OPERATION 7 Subwoofer Lch HPF LPF STEREO MONG l f L J R e Bridged 1 0 Left FILTER OPERATION OFF S STEREO MONO Lch Hee Ae a speaker UT TE OPERATION W RI g ht HPF PF STEREO MONO e m speaker e INPUT SENSITIVITY V 1 0 FILTER OPERATION 0 5 OFF Hpi Lpp STEREO _MONO Lch n pran MIN INPUT A SENSITIVITY V ee CONTROL B FILTER OPERATION OFF h HPF LPE STEREO MONO INPUT SENSITIVITY V Subwoofer e L R Bridged Principle of Tri mode Method of frequency band division using a coil and capacitoresein case of 6dB oct slope Coil L Passes low frequencies and blocks high frequencies Low pass Capacitor C Passes high frequencies and blocks low o frequencies High pass L ng l C C 159000 uF fexR fc Cut of Frequency Hz 159xR R Speaker Impedance Q Crossover Frequency Example When it is required to set a crossover frequency of 120 Hz using speakers with an impedance of 4 ohms Prepare commercially available coil and capacitor with the closest ratings to the results calculated from the formula above The capacitor rating should be as close as possible to 331 25 uF and the coil rating should be as close as possible to 5 3 mH ACAUTION e f you wish to bridge connect a speaker
4. A B Speaker Bridged 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 Examples Stereo Connections 4Q KAC 648 50 W or greater Bridged Connections 4Q 140 W or greater Maximum output of Combined the amplifier impedance Rated input power and impedance of the speakers E RCA cable connection Do not connect cables and leads to both RCA cable input jacks and the speaker input terminals simultaneously for this may cause malfunction or damage RCA cable ground terminal Left input Left input al OPERATION FILTER Leh STEREO MONO OFF IN MAX INPUT 4 CHANNEL INPUT SENSITIVITY V o POWER AMPLIFIER control amp RCA cable Commercially available part To Power control REMOTE terminal CENTER UNIT Cassette receiver CD receiver etc
5. E T 5OW x 4 IV UE AU cepa tances A geet pec EN ues acl A D E E cdeect tensee a EEA 5OWx2 140W x 1 2 Chantel IWC OS acts cic cisccsacsinacrtsntiacdic carbine Oted arbeicas dete basta a A aE 140 W x 2 Rated Power Output 4 Q 4 Channel Mode vicccciccceciscisccsctsscasnancateireavacnssiedstearsbeeeveenniaenacearees 25 W x 4 DIN45324 B 14 4 V 3 Channel Mode sssini 25 W x 2 1 kHz 0 08 THD 70 W x 1 1 kHz 0 8 THD 2 Channel VOE sis scciccsinsccrenesinsisantiantatanedniacteda addins E E e iii TOW x2 1 kHz7 0 8 THD Rated Power Output 2 Q A Cannel MOE ctaaesanaaiixetacaaronneueaaetseuaadacentagus aa aAA RACE 35 W x 4 1 kHz 0 8 THD Freguency FRO SOONG Sorceress ccicaciecces bet r a a a i 10 Hz 45 kHz 0 1 dB gnal to Noise RaO tcaissarecsascdstdaasaraatiatnaita vuntenaiteind ae a A 100 dB SUE WED a E E disen mcbanisei seis 0 2 V rated output SSMS IMI E AE E E E E E EE E 4 0 V rated output AA EE N E E ocean E E E E E E E E ET 10 kQ LON Fa S FT opere A E a a a Gaedvodies 80 Hz 12 dB oct Riom Pase FITE aesan A E a 150 Hz 12 dB oct General Operating Voltage aii siwaiasiscisnsnicawaanaiasadiinsdsdastesdindisdsinadsisiumadibbabladestabaateias 14 4 V 11 16 V allowable Cumont Consumo MOP serne a E E 22 A 1 kHz 10 THD eH nca an E EEE ET E EE ET 260 x 56 5 x 209 mm REY TOM aae E E E A E EE E EE E E 3 0 kg 12
6. 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 Failure 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 6 Connection E Power cable connection AWARNING To prevent fire caused by a short in the wiring connect a fusible link or breaker nearby the battery s positive terminal SPEAKER LEVEL INPUT Ou 1 POWERIN SPEAKER OUTPUT BRIDGED FUSE SA e LEFT ORIGHTO AEE A Bw Power terminal l Terminal cover Battery cable 00 D Protective Fuse Battery Power terminal Connect to their respective terminals the power control cable power supply cable and ground cable all of which pass through the associated terminal cover Once the connections are complete place the cover on the terminal section Wiring e f a buzzing noise is heard from the speakers when the engine is running connect a line noise filter optional to each of the battery cable e Do not allow the cord to directly contact the edge of the iron plate by using Grommets e Connect the ground cable to a metal part of the car chassis that acts as an electrical ground pa
7. KENWOOD KAC 648 INSTRUCTION MANUAL KENWOOD CORPORATION Safety precautions AWARNING To prevent injury and or fire take the following precautions e When extending the battery or ground cables make sure to use automotive grade cables or other cables with an area of 3 mm AVVG12 or more to prevent cable deterioration and damage to the cable coating e To prevent short circuits never put or leave any metallic objects e g 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 e 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 Vhen 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 Protection function e To prevent short circuits when replacing a fuse first disconnect the wiring harness e f you experience problems during installation consult your Kenwood dealer
8. installation places such as inside the trunk etc can be considered e Use the extension cables Optional O Raae CA2SL_ CAA2SL CAL CAS2SL RCA cable ermm CASWL CATAWL CAZaWL CAS3INL _ RCA cable 012mm CASW CATSW CAZ6W CAW CASSW 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 that 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 e Do not install near the dashboard rear tray or air bag safety parts e 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 e After installing the unit check to make sure that electrical equipment such as the brake lamps turn signal lamps and windshield wipers operate n
9. o the battery s negative terminal 2 Power Indicator 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 cables 5 Connect the power cable power control cable and grounding cable following this order 6 Install the unit in the car 7 Connect the negative terminal of the battery ACAUTION e Be sure to turn the power off before changing the setting of any switch e f the fuse blows check cables 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 speaker cables to appropriate speaker connectors separately Sharing the negative cable of the speaker or grounding speaker cables 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 Installation Installation board etc beide eam thickness 15 mm or more e Since the power amplifier 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
10. ormally 3 Controls 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 25A A P CON REMOTE POWER IN SPEAKER OUTPUT BRIBED LEFT SPEAKER LEVEL INPUT ejojojo oleje joj E L L R ep D ORA h rL TER l FILTER OPERATION f neutse CTOR OFF gt STEREO _MONO Lch AB FA daD OFF 1 B B STEREO MONG HPE pa HPF LPF Tan Independent j Input sensitivity ve o Fuse 25 A x 1 2 Battery terminal 3 Ground terminal 4 Power control REMOTE terminal 6 Amplifier A speaker output terminals Amplifier B speaker output terminals SPEAKER OUTPUT terminals e Stereo Connections When you wish to use the unit as a stereo amplifier stereo connections are used The speakers to be connected should have an impedance of 2Q or greater When multiple speakers are to be connected ensure that the combined impedance is 2Q or greater for each channel e Bridged Connections When you wish to use the unit as a high output monaural amplifier bridged connections are used Make connections to
11. ower output refer to the Specifications in the instruction manual of the center unit OPERATION switch The amplification methods of the signals input to amplifiers A and B can be selected System examples independently according to the setting of this switch e STEREO position The amplifier can be used as a stereo amplifier e MONO Lch position Amplities 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 5 FILTER switch These switches allow filtering of the speaker output signals e HPF High Pass Filter position Only frequencies of 150Hz or higher are output Frequencies below 150Hz are cut e LPF Low Pass Filter position Only frequencies of 80Hz or lower are output Frequencies above 80Hz are cut The Lch and Rch will be mixed before output even if the operation switch is set to STEREO e OFF position The original sound without filtering is output E Full range 4 channel Subwoofer system FILTER OPERATION OFF HPF LPF STEREO MONO Lch INPUT SELECTOR CONTROL A AJB LA ee CONTROL B FILTER OPERATION Le HPF LPF STEREO MONO 2 Front speaker Rear O speaker Subwoofer Power amplifier System examples E High pass Subwoofer system 1 0 FILTER OPERATION HPF LP STEREO MONO Lch R
12. ssing electricity to the battery s negative terminal Do not turn the power on if the ground cable is not connected e Be sure to attach a protective fuse Into the battery cable 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 cable for the battery cable and the ground cable The current capacity of the power supply wiring cable 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 cable and protective fuse of greater current handling capacity than the total maximum current drawn by each amplifier Example One Power Amplifier ls Used Maximum Current Protective Fuse Cross sectional Area of Wiring Drawn Cable AWG KAC 648 30Ax1 15Ax2 3mm AWG 12 or greater x 1 Connection E Speakers cable connection Stereo Connections Lead terminal Commercially available parts Eo fas sd SPEAKER ee S jojojo ejeojojo L R Rear Left speaker Lead terminal Speaker Bridged Commercially available parts Bridged Connections Bridged output POWER IN ZE E BATT Il P 9g EI 24 SPEAKER i er i gt aez bd A A Ad i
13. ted when the power of the genuine accessory car stereo is switched ON OFF 10 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 The output level is too small or too large The sound quality is bad The sound is distorted POSSIBLE CAUSE e Input or output cables are disconnected e Protection circuit may be activated e The fuse may be blown because the volume was too high The input sensitivity adjusting control is not set to the correct position e The speakers cable are connected with wrong polarity e A speaker cable is pinched by a screw in the car body e The switches may be set improperly SOLUTION e Connect the input or output cables e Check connections by referring to Protection function e Replace the fuse with a new fuse and use a lower volume Adjust the control correctly referring to Controls e Connect them properly checking the of the terminals and cables well e Connect the speaker cable again so that it is not pinched by anything e Set switches properly by referring to System examples 11 Specifications Specifications subject to change without notice Audio Section Max Power Output 4 Q PASI NOUS a E E EE E A E T E A EE
14. the LEFT channel and the RIGHT channel SPEAKER OUTPUT terminals The speakers to be connected should have an impedance of 4Q or greater 4 lee LPF When multiple speakers are to be connected ensure that the combined impedance is 4Q or greater ACAUTION The rated input of the speakers should be no less than the maximum output of the amplifier Otherwise malfunction may result T Speaker level input terminals INPUT SELECTOR switch This switch selects the input method of th signals to be amplified by amplifiers A and O B a INPUT SELECTOR e AB position Amplifies both of the signals input to amplifiers A and B e A position Amplifies only signal input amplifier A with both amplifiers A and B Amplifier A LINE IN terminal Amplifier B LINE IN terminal a1 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 2 RCA cable ground lead terminal 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 genuine accessory car stereo The sensitivities of amplifiers A and B can be 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 p
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