Kenwood KAC-749S Instruction Manual

Also see for KAC-849: Instruction manual Service manual

Contents

System examplesLRLRABABLRLRABLRLRABLRLRABLRLRABLRLRABLRLRONOFFBASS BOOST(B.CH)LPFHPFOFFA.CH FILTERLPFHPFOFFB.CHONOFFBASS BOOST(B.CH)LPFHPFOFFA.CH FILTERLPFHPFOFFB.CHONOFFBASS BOOST(B.CH)LPFHPFOFFA.CH FILTERLPFHPFOFFB.CHOPERATION INPUT SELECTORMONO(Lch)STEREOA.CHMONO(Lch)STEREOB.CH A AB7#$ %OPERATION INPUT SELECTORMONO(Lch)STEREOA.CHMONO(Lch)STEREOB.CH A AB$ %OPERATION INPUT SELECTORMONO(Lch)STEREOA.CHMONO(Lch)STEREOB.CH A AB$ %OPERATIONFRINPUT SELECTORMONO(Lch)STEREOA.CHMONO(Lch)STEREOB.CH A AB$ %@7# @7# @2002005050 LPFHPF15080 15010080A.CH B.CHFILTER FREQUENCY(Hz)1002002005050 LPFHPF15080 150100801002002005050 LPFHPF15080 15010080A.CH B.CHFILTER FREQUENCY(Hz)1002002005050 LPFHPF15080 150100801002002005050 LPFHPF15080 15010080A.CH B.CHFILTER FREQUENCY(Hz)1002002005050 LPFHPF15080 1501008010040LEFTBRIDGEDSPEAKERPOWER INP.CONBATT.FUSE(40A) OUTPUT RIGHTABPOWER AMPLIFIERGND432 LAARLRBABBThis is a 4 channel amplifier including 2 stereoamplifiers in a body. One amplifier is referred to asamplifier A and the other is amplifier B. This unit iscompatible with a large variety of systems bycombining the switches and functions describedin the following.1 Fuse40 A × 1 : KAC-84930 A × 1 : KAC-749SIf you can’t find the specified capacity fuse at yourstore etc., consult your Kenwood dealer.2 Battery terminal3 Ground terminal4 Power control terminal5 Amplifier A/B SPEAKER OUTPUTterminals• Stereo Connections:When you wish to use the unit as a stereoamplifier, stereo connections are used.• Bridged Connections:When you wish to use the unit as a high-outputmonaural amplifier, bridged connections areused. (Make connections to the LEFT channel (+)and the RIGHT channel (–) SPEAKER OUTPUTterminals.)6 INPUT SENSITIVITY controlSet this control according to the pre-output level ofthe center unit connected with this unit, or to themaximum power output of the genuine-accessorycar stereo.The sensitivities of amplifiers A and B can beadjusted independently regardless of the positionof the input selector switch.Use the diagram on the right as a guide.For the pre-output level or the maximum poweroutput, refer to the “Specifications” in theinstruction manual of the center unit.7 FILTER FREQUENCY controlWhen the FILTER switch is set to the HPF (High-Pass Filter) or LPF (Low-Pass Filter) position, thethreshold frequency can be adjusted with thiscontrol.8 RCA cable ground lead terminalWhen using an RCA cable with a ground leadattached, connect the ground lead to this terminal.Do not use this terminal for power sourcegrounding. This unit will be damaged if the powersource grounding wire is connected to thisterminal.9 Amplifier A/B LINE IN terminals0 LINE OUT terminalThese jacks output respectively the signals input toamplifiers A and B. They always output the stereosignals regardless of the position of theOPERATION switch.! Speaker level input terminals@ BASS BOOST switchWhen the switch is in “ON” position, the bass isboosted by 6 dB.The bass boost applies only to the B amplifier.# FILTER switchThis switch allows to apply high-pass or low-passfiltering to the speaker outputs.• HPF (High-Pass Filter) position:The filter outputs the band of higher frequenciesthan the frequency set with the FILTERFREQUENCY control.• OFF position:The entire bandwidth is output without filtering.• LPF (Low-Pass Filter) position:The filter outputs the band of lower frequenciesthan the frequency set with the FILTERFREQUENCY control.The speaker output is automatically turnedmonaural (L+R).$ OPERATION switchThe amplification methods of the signals input toamplifiers A and B can be selected independentlyaccording to the setting of this switch.• STEREO position:The amplifier can be used as a stereo amplifier.• MONO (Lch) position:Amplifies the signal input from the left side only.Set to this position and make bridgedconnections to use as a high-power monauralamplifier. (The input right signal is not output.)% INPUT SELECTOR switchThis switch selects the input method of the signalsto be amplified by amplifiers A and B.• A B position:Amplifies both of the signals input to amplifiers Aand B.• A position:Amplifies only signal input amplifier A with bothamplifiers A and B.Power indicatorWhen the power is turned on, the Power indicatorlights.If the Power indicator does not light when the poweris turned on, the protection function may beactivated. Check whether there is any indication oftrouble.■ The protection function is activatedin the following situations:This unit is equipped with a protection function forprotecting this unit and your speakers from variousaccidents or problems that can occur.When the protection function is triggered, thePower indicator goes off and the amplifier stopsoperating.• When a speaker wire may be short-circuited.• When a speaker output contacts ground.• When the unit malfunctions and a DC signal issent to the speaker output.• When the internal temperature is high and unitwon’t operate.• When a ground wire of the center unit (cassettereceiver, CD receiver, etc.) or this unit is notconnected to a metal part serving as an electricalground passing electricity to the battery'snegative - terminal.2CAUTIONNOTENOTEControls640ONOFFBASS BOOST(B.CH)LPFHPFOFFA.CHA.CHFILTER OPERATION INPUT SELECTOR LINE IN LINE OUTSPEAKER LEVEL INPUTMONO(Lch)STEREOA.CHMONO(Lch)STEREOB.CHLPFHPFOFFB.CHB.CHLEFTBRIDGEDSPEAKERPOWER INP.CONBATT.FUSE(40A) OUTPUT RIGHTABPOWER AMPLIFIER0.2(MAX)(MIN)50.30.512340.2(MAX)(MIN)50.30.5123480INPUT SENSITIVITY(V)GNDA AB ALRA +B BABL R0.2(MAX)(MIN)50.30.51234INPUT SENSITIVITY(V)ONOFFBASS BOOST(B.CH)LPFHPFOFFA.CH FILTER OPERATION INPUT SELECTORMONO(Lch)STEREOA.CHMONO(Lch)STEREOB.CHLPFHPFOFFB.CHA AB2002005050 LPFHPF15080 150100A.CH B.CHFILTER FREQUENCY(Hz)1002002005050 LPFHPF15080 15010080100GND1 02 3 4 85 !6@ $ %MAXIMUM POWER4/3/2 CHANNEL AMPLIFIERKAC - 749SMAXIMUM POWER9#74 / 3 / 2 CHANNELAMPLIFIERKAC-849(W)25401510Power indicatorKAC-849 KAC-749STerminal coverBatteryGround wire*Battery wire*Protective Fuse*Power control wire*■ Power wire connectionLCCLCCONOFFBASS BOOST(B.CH)LPFHPFOFFA.CH FILTERLPFHPFOFFB.CHOPERATION INPUT SELECTORMONO(Lch)STEREOA.CHMONO(Lch)STEREOB.CH A AB$ % # @LRLRLRLRABConnectionFor safe installation, read "Installation procedure" before starting work.NOTE40ONOFFBASS BOOST(B.CH)LPFHPFOFFA.CHA.CHFILTER OPERATION INPUT SELECTOR LINE IN LINE OUTSPEAKER LEVEL INPUTMONO(Lch)STEREOA.CHMONO(Lch)STEREOB.CHLPFHPFOFFB.CHB.CHLEFTBRIDGEDSPEAKERPOWER INP.CONBATT.FUSE(40A) OUTPUT RIGHTABPOWER AMPLIFIER40LEFTBRIDGEDSPEAKERPOWER INP.CONBATT.FUSE(40A) OUTPUT RIGHTABPOWER AMPLIFIER0.2(MAX)(MIN)50.30.512340.2(MAX)(MIN)50.30.51234INPUT SENSITIVITY(V)GNDA AB ALRA +B BABL RONOFFBASS BOOST(B.CH)LPFHPFOFFA.CHA.CHFILTER OPERATION INPUT SELECTOR LINE IN LINE OUTSPEAKER LEVEL INPUTMONO(Lch)STEREOA.CHMONO(Lch)STEREOB.CHLPFHPFOFFB.CHB.CH0.2(MAX)(MIN)50.30.512340.2(MAX)(MIN)50.30.51234INPUT SENSITIVITY(V)GNDA AB ALRA +B BABL RL LAALAABRBRL RR LRA RBBLARLRBLB2002005050 LPFHPF15080 15010080A.CH B.CHFILTER FREQUENCY(Hz)1002002005050 LPFHPF15080 150100801002002005050 LPFHPF15080 15010080A.CH B.CHFILTER FREQUENCY(Hz)1002002005050 LPFHPF15080 15010080100GND GND4 4LEFTBRIDGED RIGHTABBRIDGEDRLLEFTBRIDGED RIGHTABBRIDGEDRL85 5GNDCENTER UNIT (Cassette receiver,CD receiver, etc.)Power control wire*RCA cable*Genuine-accessorycar stereo (No lineoutput center unitetc.)ACCBatteryCar fuse boxLead terminal* Lead terminal*■ 4-channel ■ 4-channel■ 3-channel■ 2-channel■ 2ch + woofer■ 2-channel■ RCA cable connection ■ Speaker level input connection■ Speaker stereo connection ■ Speaker bridge connectionCENTERUNITCENTERUNITCENTERUNIT■ 2-channelCENTERUNIT■ Tri-modePrinciple of Tri-modeMethod of frequency band division using a coiland capacitor ... in case of 6dB/oct. slopeCoil (L): Passes low frequencies and blockshigh frequencies. (Low pass)Capacitor (C): Passes high frequencies andblocks low frequencies. (High pass)Example:When it is required to set a crossoverfrequency of 120 Hz using speakers with animpedance of 4 ohms.fc=Cut of Frequency (Hz)R=Speaker Impedance (Ω)• If you wish to bridge-connect a speaker, thespeaker impedance must be no less than 4ohms. Connecting a speaker with animpedance lower than 4 ohms may damagethe unit.• Be sure to connect capacitors to speakers towhich high frequencies will be passed.Failure to do so will result in a drop of thecombined impedance with the subwoofer.• Ensure that the withstand voltage andcurrent ratings of the capacitors (C) and coils(L) are sufficient.2CAUTIONL C0 dB-3 dBCrossover FrequencyFrequencyCENTERUNITHigh passSubwoofer(L + R)159000C= (μF)fc x R159 x RL= (mH)fc159000= = 331.25 μF120Hz x 4Ω159 x 4Ω= = 5.3 mH120HzFront left speakerFront right speakerRear left speakerRear right speakerLeft speakerRight speakerLeft speakerRight speakerSubwooferLead terminal*BridgeBridgeWhiteWhite/BlackGrayGray/BlackGreenGreen/BlackPurplePurple/BlackLeftFront leftFront rightRightRear leftRear rightFrontRearCable Color of theconnectorFR* Commercially availablepartsDescription of markings in the figure.

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