KAC-X621 KAC-PS621 KAC-X521 KAC-PS521 STEREO/BRIDGEABLE POWER AMPLIFIER INSTRUCTION MANUAL © B64-2798-00/00 (MV) Safety precautions 2WARNING 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 8 mm² (AWG 8) 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. · If 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. 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. 2CAUTION 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 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. 2CAUTION To prevent damage to the machine, take the following precautions: Protection function There is a Protection function installed in the unit to protect the unit and speakers from various problems. When Protection operates, the display informs you of the condition. Display "E-01" Informations When the inside of the unit is overheating. When the unit has failed and direct current voltage is generated to the speaker's output. NOTE · Be sure 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. "E-02" "E-03" "VOLT" display is blinked. Turn the power OFF and release the protection. If the "E-02" code does not disappear, contact your Kenwood dealer. When the speaker cord is shorted. When the speaker output is in contact with the vehicle ground. When voltage gets out of operation range. Available Control Units: A KENWOOD's LX-Bus supporting Center Unit released in 2004 or later can control this unit. The operations of the (LX) AMP Control are explained in the Operation Manual of the Center Unit. NOTE Wiring · The LX AMP and the sensor unit cannot be connected simultaneously. You must connect any of them at a time. NOTE · If you experience problems during installation, consult your Kenwood dealer. · If the unit does not seem to be working right, consult your Kenwood dealer. · 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. · 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 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 8 mm² (AWG 8) 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. Speaker Selection · 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. · The impedance of the speakers that are going to be connected should be 2 or greater (for stereo connections), or 4 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. 4 4 4 4 4 4 4 4 4 4 8 4 4 4 4 4 2 Combined impedance 4 4 4 4 4 8 2 2 English Installation Accessories Part name External View Self-tapping screws (ø5 × 18 mm) Hexagon socket head cap screw (M4 × 8 mm) Cover Number of Items 4 4 1 1 1 Terminal cover (Power terminal) Hexagon Wrench Duct Hexagon socket head cap screw (M4 × 8 mm) Hexagon Wrench Cooling fan 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 installation fittings in the unit. 7. Attach the unit. 8. Install the terminal cover. 9. Connect the negative - terminal of the battery. 2CAUTION Installation procedure Cooling fan Cover Installation board, etc. (thickness : 15 mm or more) Self-tapping screw (ø5 × 18 mm) · Do not install in the below locations; (Unstable location, In a location that interferes 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. Do not mount the unit in a place where the cooling fan and ducts of the unit are blocked. 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. · After installing the unit, check to make sure that electrical equipment such as the brake lamps, turn signal lamps and windshield wipers operate normally. English 3 Connection 2WARNING * Commercially available parts To prevent fire caused by a short in the wiring, connect a fusible link or breaker nearby the battery's positive terminal. 2CAUTION CENTER UNIT (CD receiver, etc.) RCA cable ground terminal RCA cable* Terminal cover Battery wire* Protective Fuse* Bridged Connections Battery Ground wire* LX-Bus connection CENTER UNIT To KENWOOD disc changer/ External optional accessory Set the ID number of the Master amplifier to "0". You can connect up to 7 Slave amplifiers. Assign them ID numbers "1" to "7" and do not duplicate them. 2CAUTION Power control wire Control cable (option) · Do not connect 2 Master amplifiers to the Center Unit. If done, you cannot control all amplifiers connected to the Center Unit. · The LX AMP and the sensor unit cannot be connected simultaneously. You must connect any of them at a time. NOTE Master amplifier Extension wire* S-video cable* Slave amplifier 1 Slave amplifier 7 4 English · The total length of S-video cables you can connect is 14 meters (46 ft) maximum. If the cable length exceeds this limit, you cannot control amps from the Center Unit. · If you assign the same ID number to multiple amplifiers, they malfunction when you operate any of them from the Center Unit. · If you assign ID number "8" or "9" to a Slave amplifier, it is not recognized by the Center Unit. RCA cable* Not more than 14m (46 ft) · If 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. · If 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 wires 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. Power control wire Left input Right input Lead terminal* Right speaker Left speaker Speaker (Bridged) Controls KAC-X521/ KAC-PS521 KAC-X621/ KAC-PS621 1 Fuse (KAC-X621/PS621 : 25 A × 3 , KAC-X521/PS521 : 30 A × 2) 2 Battery terminal 3 Ground terminal 4 Power control terminal Controls the unit ON/OFF. NOTE # Power indicator Lights when the POWER switch is turned On. The indicator flashes several seconds when the POWER switch is turned On or when the Protection function is activated. $ LPF FREQUENCY control Sets the cutoff frequency when the "FILTER" switch is set to "LPF". Sets the cutoff frequency when the "FILTER" switch is set to "HPF". Controls the unit power. Be sure to connect it with all the systems. % HPF FREQUENCY control ^ FILTER switch 5 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 2 or greater. When multiple speakers are to be connected, ensure that the combined impedance is 2 or greater for each channel. When you wish to use the unit as a high-output monaural amplifier, bridged connections are used. (Make connections to the LEFT channel 9 and the RIGHT channel · SPEAKER OUTPUT terminals.) The speakers to be connected should have an impedance of 4 or greater. When multiple speakers are to be connected, ensure that the combined impedance is 4 or greater. 2CAUTION This switch allows to apply high-pass or low-pass filtering to the speaker outputs. · HPF (High-Pass Filter) position: The filter outputs the band of higher frequencies than the frequency set with the "HPF FREQUENCY" control. The entire bandwidth is output without filtering. 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). · Bridged Connections: · OFF position: · LPF (Low-Pass Filter) position: & AMP CONT (amplifier control) switch · ON position: The rated input of the speakers should be no less than the maximum output of the amplifier. Otherwise malfunction may result. Used to bypass the circuit when you do not control the sound with the Amplifier Control. Allows you to control the sound with the Amplifier Control. Bypasses the Amplifier Control circuit. NOTE 6 RCA cable ground lead terminal 7 ID NUMBER switch · OFF position: When using an RCA cable with a ground lead attached, connect the ground lead to this terminal. Sets an amp identification number (ID) to be used for amplifier control from the Center Unit. Assign ID Number "0" to an amplifier when you use it as the Master amplifier. As ...