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Kenwood KAC-7251 Car Stereo System User Manual

1. E Power wire connection eevee i Lead terminal Terminal cover Extension wire Battery wire D Protective Fuse Battery English 9 System examples E 2 channel system IS Left speaker ENTER UNIT E N ED a m REMOTE 1238 STEREO MONO Lch FILTER 8 BASS BOOST OPERATION CENTER UNIT m w REMOTE 1248 STEREO MONO Lch FILTER 8 BASS BOOST OPERATION Left speaker High pass CENTER UNIT L Right speaker High pass Subwoofer L R Bridged m w OFF REMOTE ae STEREO MONO Lch FILTER 8 BASS BOOST OPERATION mi HPF JL LPF memori 9B STEREO MONO Lch FILTER BASS BOOST OPERATION 10 English B8 Tri mode Subwoofer CENTER UNIT L R Bridged m m n OFF REMOTE Lu STEREO MONO Lch Qo FILTER 8 BASS BOOST OPERATION Oe Principle of Tri mode Method of frequency band division using a coil and capacitor in case of 6dB oct slope Coil L Passes low frequencies and blocks high frequencies Low pass
2. DIN 45324 B 14 4V ie 150W x2 2 Q 1 kHz 0 8 96 THD Bridged 4 Q 1 kHz 0 8 THD Frequency Response 0 3 dB J Sensitivity rated output MAX sssssssssssseeeeeeeeneeeeeeennn eene nennen nene enne 0 2V Du bc Le 5 0 V Signal to Noise Ratio 100 dB Ut APSO ANCE ise sass rm 10 kQ Low Pass Filter Frequency 18 dB oct b0 200 Hz variable High Pass Filter Frequency 12 dB oct ccccccceceecceeeeeeeceeeeeeeeeeeecceeeeceseeeseceeeesseeeesneteesneaees 150 Hz Bass Boost Circuit 90 Hz KAC 725b1 scite eee dnte OFF 6 9 12 dB KAC 7201 ie OFF 12 dB General Operating Voltage ccrte trt eger ene i Eten nee dne esses 14 4 V 11 16 V allowable Current Consumption 4 Q 10 96 THD iii 43A Dimensions QW H x D ie oss disease a ait nexis de eden ease dap Pe tidie did ds 285 x 57 x 305 mm 11 1 4 x 2 1 4 x 12 inch TE Re 3 32 kg 7 3 lbs English 13
3. 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 Protection function There is a Protection function installed in the unit to protect the unit and speakers from various problems When Protection operates the indicator informs you of the condition Refer to page 5 Accessories Number of Items External Part name View Self tapping screws 94 x 16 mm Terminal cover Power terminal Speaker level input cable KAC 7251 only Number of Items External Part name View Remote cable X Neh Remote controler Knob Dressing plate ED Nut O Washer Self tapping screws 93 x 12 mm NLIS Double side tape Installation Remote controler KAC 7251 only Double side tape E rt d Remote controler Self tapping screw 94 x 16 mm Cooling fan Self tapping screw 93 x 12 mm Dressing plate Washer NOTE Mount the Dressing plate according to the mount angle of the Remote Controller Fully rotate the knob KENWOOD counterclockwise CCW and adjust the marking of the knob to the OFF position of the Dressing plate Installation board etc thickness 15 mm or more ACAUTION Do not install in the below locations Unstable location In a location that in
4. LN Capacitor C Passes high frequencies and blocks low 3 dB frequencies High pass RE 159000 d ROM hur c fcx R HF fc Cut of Frequency Hz Frequency L 159xR R Speaker Impedance Q i fc Crossover Frequency mH eExample 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 f 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 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 Ensure that the withstand voltage and current ratings of the capacitors C and coils L are sufficient English 11 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 POSSIBLE CAUSE Input or output cables are SOLUTION Connect the input or output No sound from one side Blown f
5. that electrical equipment such as the brake lamps turn signal lamps and windshield wipers operate normally English 3 Controls Indicator PF FREGUENCY Hz 109 050 FILTER OST LPF FREQUENCY control Sets the cutoff frequency when the FILTER switch is set to LPF Q FILTER switch This switch allows to apply high pass or low pass filtering to the speaker outputs HPF High Pass Filter position Only frequencies of 150 Hz or higher are output Frequencies below 150 Hz are cut OFF position The entire bandwidth is output without filtering 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 Switched to monaural L R BASS BOOST switch Sets the boost level for bass control 12dB position BASS BOOST is 12 dB KAC 7201 OFF position BASS BOOST is OFF KAC 7251 OFF REMOTE position Can be set from the Remote Controller NOTE If you have disconnected the Remote Controller the BASS BOOST is turned OFF 4 English INPUT SENSITIVITY VI 1 Len OPERATION I INPUT SENSITIVITY are k 120 4 O 8 0 2 MAX OPERATION switch This switch is used to select the operation mode of the amplifier STEREO pos
6. KENWOOD KAC 7251 KAC 7201 INSTRUCTION MANUAL MODE D EMPLOI AMPLIFICADOR DE POTENCIA p gina 26 37 MANUAL DE INSTRUCCIONES KENWOOD CORPORATION ce CHO Take the time to read through 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 7251 7201 Serial number PRINTED IN CHINA B64 2569 00 00 KV EV Safety precautions AWARNING 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 the unit f 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 ACAUTION To prevent damage to the machine take the following precautions Be sure
7. ions 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 The speakers to be connected should have an impedance of 4Q or greater 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 6 English amp 3 RCA cable ground lead terminal When using an RCA cable with a ground lead attached connect the ground lead to this terminal LINE IN terminal LINE OUT terminal The signal that s input from the line input terminal is output REMOTE terminal KAC 7251 only Connects the Remote cable NOTE Use the Remote cable of the accessory Speaker level input terminals NOTE The genuine accessory car stereo shall have a maximum power output of no more than 40 W Do not connect the speaker output leads rom a power amplifier Optional to the speaker level input terminals of this unit or this may cause malfunction or damage Do not connect cables and leads to both RCA cable input jacks and the speaker evel input terminals simultaneously for his may cause malfunction or damage Connect the power control lead to a power supply which can be turned ON OFF by the ignition key switch ACC ine W
8. ith this connection shock noise may be generated when the power of the genuine accessory car stereo is switched ON OFF W 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 unit in the car 7 Connect the negative terminal of the battery To prevent fire caused by a short in the wiring connect a fusible link or breaker nearby the battery s positive terminal ACAUTION 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 e f 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 wi
9. ition 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 bridged connections to use as a high power monaural amplifier The input right signal is not output INPUT SENSITIVITY control Set this control according to the pre output evel 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 NOTE For the pre output level or the maximum power output refer to the Specifications n the instruction manual of the center unit Remote controler control KAC 7251 only When the BASS BOOST switch is in the OFF REMOTE position control the Bass Boost level from the Remote Controller OFF position BASS BOOST is OFF e 6 9 12 position Boost the bass sound by 6 dB 9 dB and 12 dB respectively Remote controler KAC 7251 only KENY OOD 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 ms TN co I iti LL VER ER ER Up B The p
10. ould 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 The impedance of the speakers that are going to be connected should be 2 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 Combined impedance English 7 Connection E RCA cable or Speaker level input connection RCA cable Connections RCA cable ground terminal US RCA cable CENTER UNIT CD receiver etc Left input Right input gt eren Power control wire Blue White Speaker level input Connections Cable Color of the connector White Black Gray Gray Black E Remote cable connection KAC 7251 only Remote cable VI Remote controler 8 English Commercially available parts E Speaker wire connection Stereo Connections Left speaker Right speaker
11. res 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 Wiring Take the battery wire for this unit directly from the battery If it s connected to the vehicle s wiring harness it can cause blown fuses etc 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 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 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 unit s 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 E Speaker Selection The rated input power of the speakers that are going to be connected sh
12. rotection 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 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 English 5 Connection E Terminal names Dr an lol D mad Fuse 30 A x 2 Battery terminal Ground terminal Power control terminal Controls the unit ON OFF NOTE Controls the unit power Be sure to connect it with all the systems 2 Speaker output terminals 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 Bridged Connect
13. terferes 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 fans to decrease the internal temperature Be careful not to block the cooling fan openings when installing the unit 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 e After installing the unit check to make sure
14. the unit is connected to a 12V DC power supply with a negative ground connection Do not open the top or 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 f 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 2 English 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 To prevent battery rise
15. use The output level is too small or too large The sound quality is bad The sound is distorted The Remote Controller does not function 12 English disconnected Protection circuit may be activated Volume is too high The speaker cord is shorted The input sensitivity adjusting control is not set to the correct position The speakers wire are connected with wrong polarity A speaker wire is pinched by a screw in the car body The switches may be set improperly The BASS BOOST switch is in the incorrect position The Remote Cable is disconnected cables Check connections by referring to Indicator Replace the fuse and use lower volume After check the speaker cord and fixing the cause of the short replace the fuse Adjust the control correctly referring to Controls Connect them properly checking the 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 System examples e Set the BASS BOOST switch to the OFF REMOTE position Connect the Remote Cable securely and correctly Specifications Specifications subject to change without notice Audio Section Max POW6m GUEGDIE c sme rta ncc ERREUR RA essct EE ER E e gU DE pa ERG 800 W x 1 Rated Power Output Normal 4 Q 20 Hz 20 kHz 0 08 THD riirii eee 150W x2 4 Q

Kenwood KAC-7251 Car Stereo System User Manual

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