Kenwood Car Amplifier KAC 6403 User Manual

4/3/2 CHANNEL POWER AMPLIFIER  
KAC-6403  
INSTRUCTION MANUAL  
© B64-3354-00/00 (MV)  
 
Installation  
Self-tapping screw  
(ø4 × 16 mm)  
330 mm  
204 mm  
Ø4.6  
Installation board, etc.  
(thickness : 15 mm or more)  
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.  
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 3  
 
Controls / Indicator  
40  
4
30  
20  
10  
(W)  
1
2
3
4
1 A ch FILTER switch  
4 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.  
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.)  
The sensitivities of amplifiers A and B can be  
adjusted independently regardless of the position  
of the input selector switch.  
Use the diagram on the right as a guide.  
2 B ch FILTER switch  
NOTE  
This switch allow filtering of the speaker output  
signals.  
For the pre-output level or the maximum power  
output, refer to the <Specifications> in the  
instruction manual of the center unit.  
• OFF position:  
The original sound without filtering is output.  
• LPF (Low-Pass Filter) position:  
Only frequencies of 80 Hz or lower are output.  
(Frequencies above 80 Hz are cut.)  
The speaker output is automatically turned  
monaural (L+R) and the bass boost function is  
activated.  
3 INPUT SELECTOR switch  
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.  
4 English  
 
5
5 Power indicator  
The protection function is activated in  
the following situations:  
When the power is turned on, the Power indicator  
lights.  
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.  
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.  
• 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.  
English 5  
 
Connection  
Terminal names  
6
7
8 9  
0
!
@
6 Fuse (25 A)  
! LINE IN terminal (A.ch/ B.ch)  
7 Battery terminal  
8 Ground terminal  
@ Speaker level input terminals  
NOTE  
• The genuine-accessory car stereo shall have a  
maximum power output of no more than 40 W.  
• Do not connect the speaker output leads from  
a power amplifier (Optional) to the speaker level  
input terminals of this unit, for this may cause  
malfunction or damage.  
9 Power control terminal  
Controls the unit ON/OFF.  
NOTE  
Controls the unit power. Be sure to connect it with  
all the systems.  
• 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.  
• 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, shock noise may be generated when  
the power of the genuine-accessory car stereo is  
switched ON/OFF.  
0 Speaker output terminals (A.ch/ B.ch)  
• Stereo Connections:  
When you wish to use the unit as a stereo  
amplifier, stereo connections are used.  
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:  
When you wish to use the unit as a high-output  
monaural amplifier, bridged connections are  
used. (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.  
2 CAUTION  
The rated input of the speakers should be no  
less than the maximum output of the amplifier.  
Otherwise malfunction may result.  
6 English  
 
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.  
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 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.)  
2 WARNING  
To prevent fire caused by a short in the wiring,  
connect a fusible link or breaker nearby the battery’s  
positive terminal.  
2 CAUTION  
• If sound is not output normally, immediately turn  
power off and check connections.  
• 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.  
• 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 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  
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  
2 Ω  
8 Ω  
Combined impedance  
English 7  
 
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)  
Speaker level input cable  
Cable Color of the connector  
White  
A channel  
Left  
White/Black  
Gray  
Genuine-accessory car  
stereo  
(No line output center unit  
etc.)  
A channel  
Right  
Gray/Black  
Green  
B channel  
Left  
Green/Black  
Purple  
Car fuse box  
@
B channel  
Right  
Purple/Black  
Battery  
ACC  
8 English  
 
* Commercially available parts  
Speaker wire connection  
(Stereo Connections)  
A channel  
Left speaker  
0
0
A channel  
Right speaker  
Lead terminal*  
B channel  
Right speaker  
B channel  
Left speaker  
(Bridged Connections)  
A channel  
Speaker (Bridged)  
0
B channel  
Speaker (Bridged)  
Power wire connection  
7
8 9  
Lead terminal*  
Terminal cover  
Power control wire  
Battery wire*  
Ground wire*  
Protective Fuse*  
Battery  
 
English 9  
System examples  
4-channel system  
Front Left speaker  
Front Right speaker  
L
L
A
B
CENTER UNIT  
R
R
Rear Left speaker  
Rear Right speaker  
L
L
R
R
1
2
3
2-channel + Subwoofer system (1)  
Left speaker (High pass)  
Right speaker (High pass)  
L
L
A
B
CENTER UNIT  
R
R
L
L
Subwoofer (L + R) (Bridged)  
R
R
1
2
3
2-channel + Subwoofer system (2)  
Left speaker (High pass)  
Right speaker (High pass)  
L
L
A
CENTER UNIT  
R
R
L
L
Subwoofer (L + R) (Bridged)  
B
R
R
1
2
3
10 English  
 
Tri-mode  
C
L
L
L
Subwoofer  
(L + R) (Bridged)  
A
B
(High pass)  
CENTER UNIT  
R
R
C
C
L
L
L
R
R
C
1
2
3
Principle of Tri-mode  
Method of frequency band division using a coil and capacitor…in case of 6dB/oct. slope  
Coil (L): Passes low frequencies and blocks high frequencies.  
(Low pass)  
Capacitor (C): Passes high frequencies and blocks low  
frequencies. (High pass)  
Crossover Frequency  
0 dB  
-3 dB  
L
C
159 x R  
fc  
159000  
fc × R  
L=  
(mH)  
(μF)  
fc=Cut of Frequency (Hz)  
R=Speaker Impedance (Ω)  
Frequency  
C=  
Example:  
When it is required to set a crossover frequency of 120 Hz using speakers with an impedance of 4 ohms.  
Prepare commercially-available coil and capacitor with the closest ratings to the results calculated from the  
formula above. The capacitor rating should be as close as possible to 331.25 (μF) and the coil rating should be as  
close as possible to 5.3 (mH).  
2 CAUTION  
• If you wish to bridge-connect a speaker, the speaker impedance must be no less than 4 ohms. Connecting a  
speaker with an impedance lower than 4 ohms may damage the unit.  
• Be sure to connect capacitors to speakers to which high frequencies will be passed. Failure to do so will result in  
a drop of the combined impedance with the subwoofer.  
• Ensure that the withstand voltage and current ratings of the capacitors (C) and coils (L) are sufficient.  
English 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  
• 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  
is not set to the correct position. to <Controls>.  
The sound quality is bad. • The speakers wire are connected with • Connect them properly checking the  
(The sound is distorted.)  
wrong + /-polarity.  
+ / - 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>.  
12 English  
 
Specifications  
Specifications subject to change without notice.  
Audio Section  
Max Power Output ........................................................................................................................................................................ 500 W  
Rated Power Output  
Normal (4 Ω) (20 Hz – 20 kHz, 1 % THD) ....................................................................................................... 40 W × 4  
Normal (2 Ω) (1 kHz, 1 % THD)............................................................................................................................ 60 W × 2  
Bridged (4 Ω) (1 kHz, 1 % THD).........................................................................................................................120 W × 2  
Frequency Response (+0, –3 dB)......................................................................................................................... 10 Hz – 50 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.) .................................................................................................................................80 Hz  
High Pass Filter Frequency (12 dB/oct.)................................................................................................................................80 Hz  
General  
Operating Voltage ............................................................................................................................ 14.4 V (11 – 16 V allowable)  
Current Consumption ...................................................................................................................................................................... 25 A  
Dimensions (W × H × D) ...............................................................................................................................330 × 60 × 230 mm  
Weight ...................................................................................................................................................................................................2.7 kg  
English 13  
 
 

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