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English

Safety precautions

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WARNING

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.

•  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.

•  Mounting and wiring this product requires skills and 

experience. For safety’s sake, leave the mounting and 
wiring work to professionals.

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CAUTION

To prevent damage to the machine, take 
the following precautions:

•  Be sure the unit is connected to a 12V DC power 

supply with a negative ground connection.

•  Do not open the 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.

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.

To prevent battery from running out

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.

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.

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 CAUTION

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.

Protection function

The protection function is activated in the following 
situations:
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.
•  When a speaker wire may be short-circuited.
•  When a speaker output contacts ground.
•  When the unit malfunctions and a DC signal is sent 

to the speaker output.

•  When the internal temperature is high and unit 

won’t operate.

•  When a ground wire 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.

B64-3924-00̲00̲M̲1English.indd   2

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07.11.15   11:29:31 AM

07.11.15   11:29:31 AM

Summary of Contents for KAC-M645

Page 1: ... B64 3924 00 00 MV 4 3 2 CHANNEL POWER AMPLIFIER KAC M845 KAC M645 INSTRUCTION MANUAL B64 3924 00 00 M 1English indd 1 B64 3924 00 00 M 1English indd 1 07 11 15 11 29 30 AM 07 11 15 11 29 30 AM ...

Page 2: ... wiring harness 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 To prevent battery from running out 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 Cleaning the unit If the front panel gets dirty turn off the p...

Page 3: ...al 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 secu...

Page 4: ...l L R and the gain is enhanced 3 INPUT SENSITIVITY control A ch B ch 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 Use the diagram on the right as a guide The sensitivities of amplifiers A and B can be adjusted independently 4 B ch LPF FREQUENCY control Sets the cutoff frequency when...

Page 5: ...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 termina...

Page 6: ... genuine accessory car stereo is switched ON OFF Speaker output terminals A ch B ch Stereo Connections The speakers to be connected should have an impedance of 2Ω or greater When multiple speakers are to be connected ensure that the combined impedance is 2Ω or greater for each channel Bridged Connections Make connections to the LEFT channel 9 and the RIGHT channel SPEAKER OUTPUT terminals The spea...

Page 7: ...ections A channel Speaker Bridged 40 25 Battery Ground wire Battery wire Protective Fuse Lead terminal Power wire connection Terminal cover B channel Left speaker B channel Right speaker B channel Speaker Bridged Power control wire KAC M645 KAC M845 B64 3924 00 00 M 1English indd 7 B64 3924 00 00 M 1English indd 7 07 11 15 11 29 37 AM 07 11 15 11 29 37 AM ...

Page 8: ...inched by a screw in the car body The switches may be set improperly Connect them properly checking the 9 of the terminals and wires well Connect the speaker wire again so that it is not pinched by anything Set switches properly by referring to Controls Specifications Audio Section KAC M845 KAC M645 Max Power Output 720 W 180 W 4 500 W 125 W 4 Rated Power Output Normal 4 Ω 20 Hz 20 kHz 1 THD 60 W ...

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