4/3/2 CHANNEL POWER AMPLIFIER KAC-M845 KAC-M645 INSTRUCTION MANUAL © B64-3924-00/00 (MV) B64-3924-00_00_M_1English.indd 1 07.11.
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 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 ■ Accessories Part name 330 mm 236 mm 230 mm 218.4 mm Ø4.6 Self-tapping screw (ø4 × 16 mm) Cooling fan (KAC-M845) Installation board, etc.
Controls p q r r t s 40W 15W 1 A ch FILTER switch This switch allow filtering of the speaker output signals. • OFF position: The original sound without filtering is output. • HPF (High Pass Filter) position: Only frequencies of 80 Hz or higher are output. (Frequencies below 80 Hz are cut.) 2 B ch FILTER switch This switch allow filtering of the speaker output signals. 4 B ch LPF FREQUENCY control Sets the cutoff frequency when the "B ch FILTER" switch is set to "LPF".
Connection ■ 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* CENTER UNIT (CD receiver, etc.) Power control wire (Blue/ White) A channel input B channel input • Speaker level input connections Cable Color of the connector A channel 9 White · White/Black Left A channel 9 Gray · Gray/Black Right B channel 9 Green · Green/Black Left B channel 9 Purple · Purple/Black Right Genuine-accessory car stereo (No line output center unit etc.
* Commercially available parts ■ Speaker wire connection • Stereo Connections A channel Left speaker A channel Right speaker Lead terminal* B channel Right speaker B channel Left speaker • Bridged Connections A channel Speaker (Bridged) B channel Speaker (Bridged) ■ Power wire connection KAC-M645 40 25 KAC-M845 Lead terminal* Terminal cover Power control wire* Battery wire* Ground wire* Protective Fuse* Battery English B64-3924-00_00_M_1English.indd 7 7 07.11.
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 POSSIBLE CAUSE SOLUTION No sound. (No sound from one side.) (Blown fuse.) • Input (or output) cables are disconnected. • Protection circuit may be activated. • Connect the input (or output) cables. • • The output level is too small (or too large). The sound quality is bad.
