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| www..com DataShee .com DataSheet 4 U .com (c) B64-1176-00 (EM) 4-CHANNEL POWER AMPLIFIER KAC-746 .com INSTRUCTION MANUAL .com DataShee Safety precautions 2WARNING Take the following precautions to prevent fire and avoid personal injury : * When extending the battery cable, or ground cable, use 5mm2 (AWG10) or larger automotive grade cable to avoid cable deterioration or damage to the covering. * Check that no metal objects (coins, tools, etc.) are left inside the unit to avoid short circuits. * If you smell or see smoke, turn the power off 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. * Do not open the top or bottom cover. * Do not install the unit in places it is exposed to direct sunlight, high heat or humidity, water may splash over it, or dust exists. NOTE * If you have difficulty in installing this unit in your vehicle, contact your Kenwood dealer. Cleaning the unit * If the surface is dirty, wipe it clean with a silicon cloth or soft dry cloth with the power off. 2CAUTION Do not use hard cloths or paint thinner, alcohol, or other volatile solvents. These may damage external surfaces or remove indicator characters. Take the following precautions to keep the unit in proper working order. * Be sure the unit is connected to a 12V DC power supply with a negative ground connection. Accessories Part name Battery cable (Yellow) (6 m) Ground cable (Black) (1 m) Self-tapping screws (o4 x 16 mm) External View Number of Items 1 1 4 1 .com 2CAUTION Part name Round terminal (Large) Round terminal (Medium) Round terminal (Small) Grommets External View Number of Items 1 2 1 1 www..com Terminal cover (Power terminal) .com DataSheet 4 U .com 2 .com t4U.com DataShee 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. 2CAUTION Installation Self-tapping screw (o4 x 16 mm) Installation board, etc. (thickness : 15 mm or more) * 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 installation, places such as inside the trunk, etc. can be considered. * Use the extension cables. (Optional.) Length 0.5m 1m 2m 4m 5m 6m Type RCA cable CA-2SL CA-12SL CA-22SL CA-52SL RCA cable (o7mm) CA-3WL CA-13WL CA-23WL CA-53WL RCA cable (o12mm) CA-5W CA-15W CA-25W CA-45W CA-65W 2CAUTION * 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. * After installing the unit, check to make sure that electrical equipment such as the brake lamps, turn signal lamps and windshield wipers operate normally. * Install the unit securely in a location that does not interfere with driving. www..com .com .com DataSheet 4 U .com * Be sure to turn the power off before changing the setting of any switch. * If the fuse blows, check cables for shorts, then replace the fuse with one of the same rating. * 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. * 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. * After installation, check that the brake lamps, winkers, and wipers work properly. .com t4U.com 3 DataShee 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. 1 FUSE(30A) POWER IN 5 BRIDGED GND BATT P.CON(REMOTE) SPEAKER OUTPUT BRIDGED A A B L R B LEFT RIGHT SPEAKER LEVEL INPUT LEFT RIGHT A SPEAKER LEVEL INPUT A B B L R 234 8 9 0 ! @ 100 80 150 100 80 6 7 INPUT SENSITIVITY(V) 0.5 0.3 GND MONO L A LINE IN B .com A+B L LINE OUT INPUT SENSITIVITY(V) 0.5 1.0 MIN MAX STEREO MONO(Lch) L+R 0.3 FILTER OPERATION 1.0 MIN STEREO MONO(Lch) L+R MAX OPERATION FILTER OFF HPF LPF 100 80 80 150 100 150 OFF HPF LPF 50 LPF 200 50 HPF 200 150 50 LPF 200 50 HPF 200 R AB A 4 CHANNEL POWER AMPLIFIER FREQUENCY(Hz) R FREQUENCY(Hz) CONTROL A INPUT SELECTOR CONTROL B Amplifier A # $ %^ Amplifier B 1 Fuse (30 A) 2 Battery terminal 3 Ground terminal 4 Power control (REMOTE) terminal 5 Amplifier A speaker output terminals 6 Amplifier B speaker output terminals 7 Speaker level input terminals 8 FREQUENCY control www..com When the FILTER switch is set to the HPF (High-Pass Filter) or LPF (Low-Pass Filter) position, the threshold frequency can be adjusted with this control. High-pass or low-pass filtering can be applied to the speaker output according to the setting of this switch. 0 OPERATION switch t4U.com The amplification methods of the signals input to amplifiers A and B can be selected independently according to the setting of this switch. 4 .com DataSheet 4 U .com 9 FILTER switch .com DataShee * STEREO position: The amplifier can be used as a stereo amplifier. * L+R position: The input left and right signals are combined before being amplified. Use this position when the unit is used for subwoofer speakers or the L+R (monaural) sound is required. * 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 10 15 0.5 0.3 1.0 MIN (W) MAX NOTE For the pre-output level or the maximum power output, refer to the "Specifications" in the instruction manual of the center unit. 25 @ RCA cable ground lead terminal # INPUT SELECTOR switch This switch selects the input method of the signals to be amplified by amplifiers A and B. * A B position: * A position: $ Amplifier A LINE IN terminal % Amplifier B LINE IN terminal ^ LINE OUT terminal Amplifies only signal input amplifier A with both amplifiers A and B. 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. Protection function 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. s 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. Power indicator www..com s The protection function activates in the following situations: .com 5 DataSheet 4 U .com * When a speaker output contacts ground. * When the unit malfunctions and a DC signal is sent to the speaker output. * When the temperature of internal parts exceeds 120C (248F). * 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 to the battery's negative - terminal. t4U.com .com Amplifies both of the signals input to amplifiers A and B. .com 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 genuineaccessory car stereo. Use the diagram on the right as a guide. DataShee Connection sRCA cable connection BLINE IN (Rear) CENTER UNIT (Cassette receiver, CD receiver, etc.) Power control cable POWER IN 2CAUTION 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. ALINE IN (Front) RCA cable (Commercially available part) GND BATT P.CON(REMOTE) A Left input (White) INPUT SENSITIVITY(V) 0.5 0.3 1.0 MAX B Left input (White) GND MONO L A LINE IN B A {B L LINE OUT INPUT SENSITIVITY(V) 0.5 0.3 100 80 100 80 150 FILTER OPERATION 1.0 MIN STEREO MONO(Lch) L {R OPERATION R AB A R FILTER OFF HPF LPF 100 80 80 150 100 150 OFF HPF LPF 50 LPF 200 50 HPF 200 150 50 LPF 200 50 HPF 200 4 CHANNEL POWER AMPLIFIER MIN MAX STEREO MONO(Lch) L {R FREQUENCY(Hz) FREQUENCY(Hz) CONTROL A INPUT SELECTOR CONTROL B .com A Right input (Red) B Right input (Red) RCA cable ground terminal 2CAUTION When using an RCA cable with Do not use this terminal for power source a ground lead attached, connect grounding. This unit will be damaged if the the ground lead to this terminal. power source grounding wire is connected to this terminal. sSpeaker level input connection Connect the unit by inserting it in the connection between the genuine-accessory car stereo and speakers. Power control (REMOTE) lead terminal ACC + - Front A Right input (Front right) SPEAKER LEVEL INPUT LEFT RIGHT A SPEAKER LEVEL INPUT A B L R A Left input (Front left) BRIDGED Battey FUSE(30A) POWER IN GND BATT P.CON(REMOTE) SPEAKER OUTPUT BRIDGED A A B L R B LEFT RIGHT B Genuine-accessory car stereo 2CAUTION B Left input (Rear left) B Right input (Rear right) www..com 6 .com DataSheet 4 U .com t4U.com * The genuine-accessory car stereo shall have a Rear maximum power output of no more than 25 W. * 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. * 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. * 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. .com DataShee sPower and Speakers cable connection * If 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. * Do not allow the cord to directly contact the edge of the iron plate by using Grommets. FUSE(30A) Power control (REMOTE) lead terminal A Left output (Front left) Front left speaker Front right speaker A Right output (Front right) BRIDGED POWER IN SPEAKER LEVEL INPUT A B L R BATT P.CON(REMOTE) A B L R B B Terminal cover Battery cable (Yellow) Fire wall Grommets Round terminal (Large) B Left output (Rear left) B Right output (Rear right) Rear right speaker Rear left speaker .com Battery + - Ground cable (Black) Power control cable 2WARNING To prevent fire caused by a short in the wiring, connect a fusible link or breaker nearby the battery's positive terminal. NOTE Connect the ground cable 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 cable is not connected. Power terminal Pass battery and ground cables through supplied terminal cover and connect to respective terminals. After completing connections, fasten terminal cover over terminal bracket. Round terminal (Medium) Round terminal (Small) (Bridged) 2CAUTION A Bridged 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. examples: FUSE(30A) www..com POWER IN BRIDGED GND BATT P.CON(REMOTE) SPEAKER OUTPUT BRIDGED A A B L R B LEFT RIGHT SPEAKER LEVEL INPUT LEFT RIGHT A A L R L L t4U.com R 4 R 8 8 B Bridged .com B B 7 DataSheet 4 U .com SPEAKER LEVEL INPUT .com GND SPEAKER OUTPUT BRIDGED A LEFT RIGHT SPEAKER LEVEL INPUT LEFT RIGHT A DataShee System examples s Full-range 4-channel + Subwoofer system L R L R L R Switch setting 100 80 100 80 150 A B A+B LINE OUT L R L R AB A FILTER 150 OFF HPF LPF OPERATION CENTER UNIT 50 LPF 200 50 HPF 200 FREQUENCY(Hz) STEREO MONO(Lch) L+R CONTROL A OPERATION FILTER OFF HPF LPF MONO(Lch) STEREO L+R 100 80 80 150 100 INPUT SELECTOR 150 50 LPF 200 50 HPF 200 FREQUENCY(Hz) CONTROL B Amplifier s High-power 2-channel system L Switch setting (Bridged) (Bridged) AB A 100 80 100 80 150 CENTER UNIT R L R L R A B A+B LINE OUT L R L R FILTER 150 OFF HPF LPF OPERATION 50 LPF 200 50 HPF 200 FREQUENCY(Hz) STEREO MONO(Lch) L+R CONTROL A OPERATION FILTER OFF HPF LPF MONO(Lch) STEREO L+R 100 80 80 150 100 INPUT SELECTOR 150 50 LPF 200 50 HPF 200 FREQUENCY(Hz) CONTROL B s High-pass (80 Hz) + Subwoofer(80 Hz) system CENTER UNIT L R L R L R Switch setting 100 80 100 80 150 A B A+B LINE OUT L R L R (High pass) FILTER 150 OFF HPF LPF OPERATION .com 50 LPF 200 50 HPF 200 FREQUENCY(Hz) Subwoofer (L + R) (Bridged) STEREO MONO(Lch) L+R CONTROL A AB A OPERATION FILTER OFF HPF LPF MONO(Lch) STEREO L+R 100 80 80 150 100 INPUT SELECTOR 150 50 LPF 200 50 HPF 200 FREQUENCY(Hz) CONTROL B s Tri-mode L R L R L R Switch setting L 100 80 100 80 150 C C C C A B A+B LINE OUT L R L R FILTER 150 OFF HPF LPF OPERATION CENTER UNIT 50 LPF 200 50 HPF 200 FREQUENCY(Hz) STEREO MONO(Lch) L+R L AB A INPUT SELECTOR OPERATION CONTROL A FILTER OFF HPF LPF MONO(Lch) STEREO L+R 100 80 80 150 100 150 50 LPF 200 50 HPF 200 FREQUENCY(Hz) CONTROL B www..com 2CAUTION t4U.com 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. 8 .com DataSheet 4 U .com qPrinciple 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 Crossover Frequency frequencies. (Low pass) 0 dB Capacitor (C): Passes high frequencies and blocks low -3 dB frequencies. (High pass) 159000 L C C= (F) fc=Cut of Frequency (Hz) fc x R R=Speaker Impedance () 159 x R Frequency L= (mH) fc qExample: 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 (F) and the coil rating should be as close as possible to 5.3 (mH). .com Troubleshooting guide Often, what appears to be a malfunction is due to user error. Before calling for service, please consult the following table. Symptom No sound. (No sound from one side.) Cause * Input (or output) cables are disconnected. * Protection circuit may be activated. * The fuse may be blown because the volume was too high. The input sensitivity adjusting control is not set to the correct position. * The speakers cable are connected with wrong + / polarity. * A speaker cable is pinched by a screw in the car body. Remedy * Connect the input (or output) cables. * Check connections by referring to "Protection function". * Replace the fuse with a new fuse and use a lower volume. Adjust the control correctly referring to "Controls". * Connect them properly checking the + / - of the terminals and cables well. * Connect the speaker cable again so that it is not pinched by anything. * Set switches properly by referring to "Controls" and "System examples". The output level is too small (or too large). The sound quality is bad. (The sound is distorted.) Specifications Audio Section Specifications subject to change without notice. Max Power Output (4 ) 4 Channel Mode ..........................................................................................................70 W x 4 3 Channel Mode ....................................................................................70 W x 2 + 200 W x 1 2 Channel Mode ........................................................................................................200 W x 2 Rated Power Output (4 ) 4 Channel Mode ..................................................................35 W x 4 (DIN45324, +B=14.4 V) 3 Channel Mode) ..................35 W x 2 (1 kHz, 0.08 % THD) + 100 W x 1 (1 kHz, 0.8 % THD 2 Channel Mode........................................................................100 W x 2 (1 kHz, 0.8 % THD) Rated Power Output (2 ) 4 Channel Mode..........................................................................50 W x 4 (1 kHz, 0.8 % THD) Frequency Response (+0, -1 dB) ............................................................................5 Hz ~ 50 kHz Signal to Noise Ratio............................................................................................................100 dB Sensitivity (MAX) (rated output) ............................................................................................0.15 V Sensitivity (MIN) (rated output) ..............................................................................................4.0 V Input Impedance....................................................................................................................10 k Low Pass Filter (12 dB/oct.) (Variable) ........................................................................50 ~ 200 Hz High Pass Filter (12 dB/oct.) (Variable) ........................................................................50 ~ 200 Hz www..com .com * The switches may be set improperly. .com DataSheet 4 U .com Operating Voltage ..............................................................................14.4 V (11 ~ 16 V allowable) Current Consumption (1 kHz, 10% THD) ................................................................................28 A Dimensions (W x H x D) ................................................................................290 x 52 x 230 mm Weight ..................................................................................................................................3.1 kg .com General t4U.com 9 |
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