Kenwood Car Stereo System KAC 8401 User Manual

KAC-8401  
4-CHANNEL POWER AMPLIFIER  
INSTRUCTION MANUAL  
© B64-2575-00/00 (MV)  
 
Installation  
Self-tapping screw  
(ø4 × 16 mm)  
Cooling fan  
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.  
• This unit has cooling fans to decrease the internal temperature. Be careful not to block the  
cooling fan openings when installing the unit. 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.  
• 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  
(W)  
40  
20  
10  
1
2
3
4
5
6
This is a 4 channel amplifier including 2  
stereo amplifiers in a body. One amplifier is  
referred to as amplifier A and the other is  
amplifier B. This unit is compatible with a  
large variety of systems by combining the  
switches and functions described in the  
following.  
3 FILTER switch  
This switch allows to apply high-pass or  
low-pass filtering to the speaker outputs.  
• HPF (High-Pass Filter) position:  
The filter outputs the band of higher  
frequencies than the frequency set with the  
FILTER FREQUENCY control.  
• OFF position:  
1 INPUT SENSITIVITY control  
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 entire bandwidth is output without  
filtering.  
• LPF (Low-Pass Filter) position:  
The filter outputs the band of lower  
frequencies than the frequency set with the  
FILTER FREQUENCY control.  
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.  
4 OPERATION switch  
The amplification methods of the signals  
input to amplifiers A and B can be selected  
independently according to the setting of  
this switch.  
NOTE  
For the pre-output level or the maximum  
power output, refer to the “Specifications”  
in the instruction manual of the center unit.  
• STEREO position:  
The amplifier can be used as a stereo  
amplifier.  
2 Bch BASS BOOST switch  
Setting this switch to "ON" emphasizes the  
bass.  
• MONO (Lch) position:  
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.)  
You can use the BASS BOOST for amplifier  
B only.  
• ON position:  
BASS BOOST is +6 dB.  
• OFF position:  
BASS BOOST is OFF.  
5 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  
 
7
The protection function is  
activated in the following  
situations:  
6 FILTER FREQUENCY control  
When the FILTER switch is set to the HPF  
(High-Pass Filter) or LPF (Low-Pass Filter)  
position, the threshold frequency can be  
adjusted with this control.  
This unit is equipped with a protection  
function for protecting this unit and your  
speakers from various accidents or  
problems that can occur.  
7 Power indicator  
When the power is turned on, the Power  
indicator lights.  
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.  
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 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  
8
9
0 !  
@
#
$
%
^
amplifier. Otherwise malfunction may  
result.  
8 Fuse (40 A)  
NOTE  
# RCA cable ground lead terminal  
When using an RCA cable with a ground  
lead attached, connect the ground lead to  
this terminal.  
If you can’t find the specified capacity fuse at  
your store etc., consult your Kenwood dealer.  
9 Battery terminal  
0 Ground terminal  
$ LINE IN terminal  
! Power control terminal  
% LINE OUT terminal  
Controls the unit ON/OFF.  
These jacks output respectively the signals  
input to amplifiers A and B. They always  
output the stereo signals regardless of the  
position of the OPERATION switch.  
NOTE  
Controls the unit power. Be sure to connect  
it with all the systems.  
^ Speaker level input terminals  
@ Speaker output terminals  
NOTE  
• 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 2or greater.  
When multiple speakers are to be  
connected, ensure that the combined  
impedance is 2or greater for each  
channel.  
• 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.  
• 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.  
• 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 4or greater.  
When multiple speakers are to be  
connected, ensure that the combined  
impedance is 4or greater.  
2CAUTION  
The rated input of the speakers should be  
no less than the maximum output of the  
6 English  
 
Installation procedure  
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.  
Wiring  
• 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.  
2.Set the unit according to the intended usage.  
3.Connect the input and output wires of the  
units.  
• 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.  
• 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  
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.  
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.  
2
diameter of 5 mm (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.  
• 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.  
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 2or  
greater (for stereo connections), or 4or  
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.  
• After installation, check that the brake  
lamps, winkers, and wipers work properly.  
2  
8Ω  
8Ω  
2Ω  
4  
4 Ω  
Combined impedance  
English 7  
 
Connection  
RCA cable or Speaker level input connection  
(RCA cable Connections)  
RCA cable ground terminal  
RCA cable*  
#
GND  
#
$
CENTER UNIT  
(CD receiver, etc.)  
B channel  
Left input  
A channel  
Left input  
Power control wire  
(Blue/ White)  
A channel  
Right input  
B channel  
Right input  
(Speaker level input Connections)  
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  
@
Lead terminal*  
A channel  
Right speaker  
B channel  
Right speaker  
B channel  
Left speaker  
(Bridged Connections)  
A channel  
Speaker (Bridged)  
@
B channel  
Speaker (Bridged)  
Power wire connection  
9
0
!
Lead terminal*  
Terminal cover  
Extension wire*  
Battery wire*  
Ground wire*  
Battery  
Protective Fuse*  
English 9  
 
System examples  
4-channel system  
Front Left speaker  
Front Right speaker  
L
L
A
B
A
B
(1)  
R
R
CENTER UNIT  
Rear Left speaker  
Rear Right speaker  
L
L
R
R
5
4
4
2
3
L
(2)  
A
B
6
R
CENTER UNIT  
L
R
5
3-channel system  
Left speaker (High pass)  
Right speaker (High pass)  
L
L
A
(1)  
A
B
R
R
CENTER UNIT  
Subwoofer (L + R)  
(Bridged)  
L
L
B
R
R
5
4
4
2
3
L
(2)  
A
B
6
R
CENTER UNIT  
L
R
5
2-channel system  
L
L
Left speaker (Bridged)  
Right speaker (Bridged)  
A
A
B
R
R
CENTER UNIT  
L
L
B
R
R
5
4
2
3
6
10 English  
 
Tri-mode  
C
L
L
L
L
Subwoofer  
(High pass)  
(High pass)  
A
B
R
R
(L + R) (Bridged)  
CENTER UNIT  
C
C
5
L
L
4
Subwoofer  
(L + R) (Bridged)  
R
R
C
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  
Crossover Frequency  
frequencies. (Low pass)  
0 dB  
Capacitor (C): Passes high frequencies and blocks low  
-3 dB  
frequencies. (High pass)  
L
C
159000  
fc x R  
159 x R  
fc  
C=  
L=  
(µF)  
fc=Cut of Frequency (Hz)  
R=Speaker Impedance ()  
Frequency  
(mH)  
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).  
2CAUTION  
• 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  
SOLUTION  
No sound.  
(No sound from one side.)  
• Input (or output) cables are  
disconnected.  
• Connect the input (or output)  
cables.  
• Protection circuit may be  
activated.  
• Check connections by referring  
to "Indicator".  
• Replace the fuse and use lower  
volume.  
• After check the speaker cord and  
fixing the cause of the short,  
replace the fuse.  
(Blown fuse.)  
• Volume is too high.  
• The speaker cord is shorted.  
The output level is too  
small (or too large).  
The input sensitivity adjusting  
control is not set to the correct  
position.  
Adjust the control correctly  
referring to “Controls”.  
The sound quality is bad.  
(The sound is distorted.)  
• 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 in the car body.  
• Connect the speaker wire again  
so that it is not pinched by  
anything.  
• The switches may be set  
improperly.  
• Set switches properly by  
referring to "System examples".  
Specifications  
Specifications subject to change without notice.  
Audio Section  
Max Power Output ............................................................................................................320 W × 2  
Rated Power Output  
Normal (4 ) (20 Hz – 20 kHz, 0.08 % THD)......................................................................60 W × 4  
Normal (2 ) (1 kHz, 0.8 % THD) ......................................................................................90 W × 4  
Bridged (4 ) (1 kHz, 0.8 % THD) ....................................................................................180 W × 2  
Frequency Response (+0, –3 dB)..................................................................................5 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.) ............................................................50 – 200 Hz (variable)  
High Pass Filter Frequency (12 dB/oct.)............................................................50 – 200 Hz (variable)  
Bass Boost Circuit (90 Hz) ..............................................................................................OFF / +6 dB  
General  
Operating Voltage ..................................................................................14.4 V (11 – 16 V allowable)  
Current Consumption (4 , 10 % THD) ......................................................................................39 A  
Dimensions (W × H × D) ......................................................................................285 × 57 × 268 mm  
............................................................................................................11-1/4 × 2-1/4 × 10-9/16 inch  
Weight ......................................................................................................................2.96 kg (6.5 lbs)  
12 English  
 

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