Kenwood Car Amplifier KAC M645 User Manual

4/3/2 CHANNEL POWER AMPLIFIER  
KAC-M845  
KAC-M645  
INSTRUCTION MANUAL  
© B64-3924-00/00 (MV)  
 
Installation  
Accessories  
External  
View  
Number of  
Items  
Part name  
330 mm  
236 mm  
Self-tapping screws  
(ø4 × 16 mm)  
4
1
1
Ø4.6  
Terminal cover  
(Power terminal)  
Speaker level input  
cable  
2 CAUTION  
• 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.  
Self-tapping screw  
(ø4 × 16 mm)  
Cooling fan  
(KAC-M845)  
Cooling fan  
(KAC-M845)  
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 fan 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.  
Installation board, etc.  
(thickness : 15 mm or more)  
• 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  
 
Controls  
p
q
t
r
s
r
40W  
15W  
1 A ch FILTER switch  
4 B ch LPF FREQUENCY control  
Sets the cutoff frequency when the "B ch FILTER"  
switch is set to "LPF".  
This switch allow filtering of the speaker output  
signals.  
• OFF position:  
5 Power indicator  
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.)  
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. Refer to <Protection function> (page 2).  
2 B ch FILTER switch  
This switch allow filtering of the speaker output  
signals.  
• OFF position:  
The original sound without filtering is output.  
• LPF (Low-Pass Filter) position:  
The filter outputs the band of lower frequencies  
than the frequency set with the "LPF  
FREQUENCY" control.  
The speaker output is automatically turned  
monaural (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 English  
 
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.  
• 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.  
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. Connect the negative - terminal of the battery.  
2 WARNING  
To prevent fire caused by a short in the wiring,  
connect a fusible link or breaker nearby the battery’s  
positive terminal.  
• 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 5 mm² (AWG 10) 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.  
2 CAUTION  
• 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.  
Speaker selection  
• The input power of the speakers that are going to  
be connected should be greater than the 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 2Ω or greater (for  
stereo connections), or 4Ω 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.  
4Ω  
4Ω  
4Ω  
4Ω  
2Ω  
8Ω  
Combined impedance  
English 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  
9
·
9
·
9
·
9
·
White  
White/Black  
Gray  
Gray/Black  
Green  
Green/Black  
Purple  
A channel  
Left  
Genuine-accessory car  
A channel  
Right  
stereo  
(No line output center unit  
etc.)  
B channel  
Left  
Speaker level input cable  
Car fuse box  
B channel  
Right  
Purple/Black  
Battery  
ACC  
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 speakers to be connected should have an  
impedance of 4Ω or greater. When multiple  
speakers are to be connected, ensure that the  
combined impedance is 4Ω or greater.  
NOTE  
• Do not connect cables and leads to both RCA  
cable input jacks and the speaker level input  
terminals simultaneously, for this may cause  
malfunction or damage.  
Speaker level input terminals  
• The genuine-accessory car stereo shall have a  
maximum power output of no more than 40 W.  
• Connect the power control lead to a power  
supply which can be turned ON/OFF by  
the ignition key switch (ACC line). With this  
connection, pop noise may be generated when  
the power of the genuine-accessory car stereo is  
switched ON/OFF.  
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 (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  
Fuse  
KAC-M845: 40 A × 1  
KAC-M645: 25 A × 1  
6 English  
 
* Commercially available parts  
Speaker wire connection  
• Stereo Connections  
A channel  
Left speaker  
š
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  
KAC-M845  
Lead terminal*  
Terminal cover  
Power control wire*  
Battery wire*  
Ground wire*  
Battery  
Protective Fuse*  
English 7  
 
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  
• Input (or output) cables are  
disconnected.  
SOLUTION  
No sound.  
• Connect the input (or output) cables.  
(No sound from one side.)  
(Blown fuse.)  
• Protection circuit may be activated.  
• Check connections by referring to  
<Protection function>.  
• Volume is too high.  
• Replace the fuse and use lower  
volume.  
• The speaker cord is shorted.  
• After check the speaker cord and fixing  
the cause of the short, replace the fuse.  
The output level is too  
small (or too large).  
• The input sensitivity adjusting control • Adjust the control correctly referring to  
is not set to the correct position. <Controls>.  
The sound quality is bad. • The speakers wire are connected with • Connect them properly checking the  
(The sound is distorted.)  
wrong 9 / · polarity. 9 / · of the terminals and wires well.  
• A speaker wire is pinched by a screw • Connect the speaker wire again so that  
in the car body. it is not pinched by anything.  
• The switches may be set improperly. • 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 × 4 40 W × 4  
Normal (2 Ω) (1 kHz, 1 % THD).................................................................... 90 W × 4 60 W × 4  
Bridged (4 Ω) (1 kHz, 1 % THD).................................................................180 W × 2 130 W × 2  
Frequency Response (+0, –3 dB)....................................................................5 Hz – 50 kHz 5 Hz – 50 kHz  
Sensitivity (rated output)........................................................................................0.2 V – 5.0 V 0.2 V – 5.0 V  
Signal to Noise Ratio...............................................................................................................94 dB 94 dB  
Input Impedance..................................................................................................................... 10 kΩ 10 kΩ  
Low Pass Filter Frequency (-12 dB/oct.).....................................50 – 200 Hz (variable) 50 – 200 Hz (variable)  
High Pass Filter Frequency (-12 dB/oct.)......................................................................80 Hz 80 Hz  
General ................................................................................ KAC-M845 KAC-M645  
Operating Voltage.................................................................... 14.4 V (11 – 16 V allowable) 14.4 V (11 – 16 V allowable)  
Current Consumption..............................................................................................................36 A 19 A  
Dimensions (W × H × D) .......................................................................330 × 59 × 230 mm 330 × 59 × 230 mm  
Weight ...........................................................................................................................................2.9 kg 2.7 kg  
• Specifications subject to change without notice.  
8 English  
 

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