KAC-818 MONO POWER AMPLIFIER INSTRUCTION MANUAL © B64-1355-00 (EM)
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 5mm 2 (AWG10) 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 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 center unit and this unit according to the required application. 5. Connect the speaker cables and sigma servo feed back cables. 6. Connect the power cable, power control cable and grounding cable following this order. 7. Install the unit in the car. 8.
Controls Operations of the following control and switches are required in accordance with the center unit and speakers connected with this unit. POWER IN FUSE(20A) ∑ SERVO ΙΙ GND BATT 20 ∑ SERVO ΙΙ SPEAKER OUTPUT P.CON(REMOTE) FUSE(20A) 20 4 1 2 3 15Hz 25Hz OFF INFRASONIC LPF INPUT FREQUENCY(Hz) SENSITIVITY(V) 100 70 50 7 200 1 2 3 4 L 6 SPEAKER LEVEL INPUT LEFT RIGHT LINE IN 0.5 150 5 R 0.3 GND 5 MONO POWER AMPLIFIER 0.
NOTE For the pre-output level or the maximum power output, refer to the “Specifications” in the instruction manual of the center unit. 0 RCA cable ground lead terminal ! LINE IN terminal @ Speaker level input terminals Power indicator ■ 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 ■ RCA cable connection 2CAUTION Left output (White) 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. Right output (Red) RCA cable (Commercially available part) 15Hz OFF 25Hz LPF INPUT FREQUENCY(Hz) SENSITIVITY(V) 100 50 200 1 2 3 4 SPEAKER LEVEL INPUT LEFT RIGHT LINE IN 0.
■ Power and Speakers cable connection Distribute the speaker cables and sigma servo cables along the same paths. Subwoofer Round terminal (Small) Power control cable (Commercially available part) POWER IN FUSE(20A) 20 BATT GND ∑ ∑SERVO SERVO ΙΙΙΙ SPEAKER OUTPUT ∑ SERVO ΙΙ P.
Sigma servo feed back The sound reproduced through conventional amplifiers is distorted due to the counterelectromotive force produced in the oscillating system of the speaker. The counterelectromotive force is particularly high with the woofer which requires a large drive mass.The sigma servo connection reduces distortion caused by the counterelectromotive force by including the circuit up to the speaker terminals in the negative feedback loop.
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 POSSIBLE CAUSE SOLUTION No sound. (No sound from one side.) • Input (or output) cables are disconnected. • The connection of the sigma servo terminals is wrong. • Protection circuit may be activated. • The fuse may be blown because the volume was too high.
