Kenwood Car Stereo System KAC 6402 User Manual

4/3/2 CHANNEL POWER AMPLIFIER  
KAC-6402  
INSTRUCTION MANUAL  
© B64-3047-00/00 (MV)  
 
Installation  
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.  
• Install this unit in a location which allows heat to easily dissipate.  
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.  
• 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 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  
 
Controls / Indicator  
40  
5
30  
20  
10  
(W)  
1
2
3
4
5
1
5
This switch allows to apply high-pass or low-pass  
filtering to the speaker outputs.  
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.  
The sensitivities of amplifiers A and B can be  
adjusted independently regardless of the  
position of the input selector switch.  
The filter outputs the band of higher frequencies  
than the frequency set with the FILTER  
FREQUENCY control.  
Use the diagram on the right as a guide.  
The entire bandwidth is output without filtering.  
NOTE  
The filter outputs the band of lower frequencies  
than the frequency set with the FILTER  
FREQUENCY control.  
For the pre-output level or the maximum power  
output, refer to the <Specifications> in the  
instruction manual of the center unit.  
2
3
4
This switch is used to select the operation mode  
of the amplifier.  
The amplifier can be used as a stereo amplifier.  
Amplifies the signal input from the left side  
only. Set to this position and make bridged  
connections to use as a high-power monaural  
amplifier. (The input right signal is not output.)  
This switch selects the input method of  
the signals to be amplified by amplifiers A  
and B.  
• A B position:  
Amplifies both of the signals input to  
amplifiers A and B.  
• A position:  
Amplifies only signal input amplifier A with  
both amplifiers A and B.  
Sets the cutoff frequency when the FILTER switch  
is set to LPF or HPF.  
English  
 
English  
Connection  
English  
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. Connect the power wire, power control wire and  
grounding wire following this order.  
• 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.  
6. Install the unit in the car.  
7. Connect the negative - terminal of the battery.  
• 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.  
• 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.  
2WARNING  
To prevent fire caused by a short in the wiring,  
connect a fusible link or breaker nearby the battery’s  
positive terminal.  
2CAUTION  
• 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.  
• The rated input power of the speakers that are  
going to be connected should be greater than the  
maximum 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  
English  
 
 
System examples  
L
R
L
R
English  
C
C
L
L
L
R
R
L
L
R
R
English  
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  
• Connect the input (or output)  
cables.  
• 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 input sensitivity adjusting  
control is not set to the correct  
position.  
• Adjust the control correctly referring  
to <Controls>.  
• The speakers wire are connected  
with wrong + /-polarity.  
• Connect them properly checking the  
+ / - of the terminals and wires  
well.  
• A speaker wire is pinched by a screw • Connect the speaker wire again so  
in the car body. that it is not pinched by anything.  
• The switches may be set improperly. • Set switches properly by referring to  
<System examples>.  
English  
 
Specifications  
Max Power Output ...............................................................................................................................................................................................400 W  
Rated Power Output  
Normal (4 Ω) (20 Hz – 20 kHz, 0.08 % THD)...................................................................................................................................35 W x 4  
Normal (2 Ω) (1 kHz, 0.8 % THD)...........................................................................................................................................................50 W x 2  
Bridged (4 Ω) (1 kHz, 0.8 % THD).......................................................................................................................................................100 W x 2  
Frequency Response (+0, –3 dB).............................................................................................................................................. 10 Hz – 45 kHz  
Sensitivity (rated output) (MAX.) ..................................................................................................................................................................... 0.2 V  
Sensitivity (rated output) (MIN.) ...................................................................................................................................................................... 5.0 V  
Signal to Noise Ratio........................................................................................................................................................................................... 100 dB  
Input Impedance.....................................................................................................................................................................................................10 kΩ  
Low Pass Filter Frequency (12 dB/oct.) ..................................................................................................................50 – 200 Hz (variable)  
High Pass Filter Frequency (12 dB/oct.).................................................................................................................50 – 200 Hz (variable)  
Operating Voltage.................................................................................................................................................. 14.4 V (11 – 16 V allowable)  
Current Consumption .............................................................................................................................................................................................25 A  
Dimensions (W x H x D).........................................................................................................................................................330 x 59 x 242 mm  
Weight............................................................................................................................................................................................................................3.0 kg  
English  
 
 

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