KAC-8401 4-CHANNEL POWER AMPLIFIER INSTRUCTION MANUAL © B64-2575-00/00 (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 automotivegrade wires or other wires with a 5 mm2 (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.
Installation Cooling fan Self-tapping screw (ø4 × 16 mm) Installation board, etc. (thickness : 15 mm or more) 2CAUTION • 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.
Controls / Indicator (W) 40 20 10 1 2 3 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 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.
7 6 FILTER FREQUENCY control 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. 7 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.
Connection ■ Terminal names 40 8 9 0 ! # 8 Fuse (40 A) NOTE If you can’t find the specified capacity fuse at your store etc., consult your Kenwood dealer. 9 Battery terminal 0 Ground terminal ! Power control terminal Controls the unit ON/OFF. NOTE Controls the unit power. Be sure to connect it with all the systems. @ Speaker output terminals • Stereo Connections: When you wish to use the unit as a stereo amplifier, stereo connections are used.
■ Installation procedure ■ Wiring 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.
Connection ■ RCA cable or Speaker level input connection (RCA cable Connections) RCA cable ground terminal D GN RCA cable* # # $ CENTER UNIT (CD receiver, etc.
* Commercially available parts ■ Speaker wire connection (Stereo Connections) @ A channel Left speaker @ Lead terminal* A channel Right speaker 40 B channel Right speaker B channel Left speaker (Bridged Connections) A channel Speaker (Bridged) @ 40 B channel Speaker (Bridged) ■ Power wire connection 40 9 0 ! Lead terminal* Terminal cover Extension wire* Battery wire* Ground wire* Protective Fuse* Battery English 9
System examples ■ 4-channel system (1) CENTER UNIT 5 4 L A R A L B R B L Front Left speaker R Front Right speaker CENTER UNIT 5 4 L A R Rear Right speaker R 2 (2) Rear Left speaker L 3 6 L B R ■ 3-channel system (1) CENTER UNIT 5 4 L A R A L B R B L Left speaker (High pass) R Right speaker (High pass) L Subwoofer (L + R) (Bridged) R 2 (2) CENTER UNIT 5 4 L A R 3 6 L B R ■ 2-channel system CENTER UNIT 4 5 L A R A L B R B L L 3 6 English Right speaker
■ Tri-mode C CENTER UNIT 5 4 L A R L L R C C L B R Subwoofer (L + R) (Bridged) (High pass) L L (High pass) R Subwoofer (L + R) (Bridged) C 2 3 ●Principle of Tri-mode Method of frequency band division using a coil and capacitor…in case of 6dB/oct. slope Crossover Frequency 0 dB -3 dB L C Frequency Coil (L): Passes low frequencies and blocks high frequencies. (Low pass) Capacitor (C): Passes high frequencies and blocks low frequencies.
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.) (Blown fuse.) POSSIBLE CAUSE • Input (or output) cables are disconnected. • Protection circuit may be activated. • Volume is too high. • The speaker cord is shorted. SOLUTION • Connect the input (or output) cables.
