Kenwood KAC-8401 User manual

KENWOOD
b
KAC-8401
4-CHANNEL POWERAMPLIFIER b page 2-13
INSTRUCTIONMANUAL
MODE D’EMPLOI
MANUALDE INSTRUCCIONES
AMPLIFICATEUR DE PUISSANCE4 CANAUX b page 14-25
AMPLIFICADOR DE POTENCIA DE4 CANALES
b pagina 26-36
KENWOOD CORPORATION
Take thetime to readthroughthisinstructionmanual.
Familiarity with installationand operation procedureswill help
you obtainthe best performancefromyour new power amplifier.
For your records
Recordthe serial number,foundon the back of the unit, inthe spaces
designatedon the warrantycard, and in the space provided below.
Referto the modeland serial numberswhenever you call uponyour
KENWOOD dealer for informationor serviceon the product.
Model KAC-8401 Serial number
0 PRINTED IN CHINA B64-2573-00/00 (KV/EV)

Safetyprecautions
External
View
Part name
I AWARNING I
To prevent injury or fire, take the following
precautions:
When extendingthe ignition, battery, or
ground wires, make sure to use automotive-
grade wires or other wires with
a 5 mm2
(AWG
10) or moreto preventwire
deteriorationand damage to the wire coating.
To prevent a short circuit, never put or leave
any metallic objects (suchas coins or metal
tools) insidethe unit.
smells, turn off the power immediatelyand
consultyour Kenwooddealer.
Do not touch the unit during use because the
surface of the unit becomes hot and may
cause burns if touched.
If the unit starts to emit smoke or strange
1 ACAUTION 1
To preventdamage to themachine, take the
followingprecautions:
Be sure the unit is connectedto a 12V DC
power supply with
a negativeground
connection.
unit.
direct sunlight or excessive heat or humidity.
Also avoid places with too much dust or the
possibilityof water splashing.
When replacing a fuse, only use a new one
with the prescribedrating.Using
a fuse with
the wrong ratingmay cause your unit to
malfunction.
To prevent a short circuit when replacing a
fuse, first disconnectthe wiring harness.
Do not open the top or bottom covers of the
Do not installthe unit in a spot exposedto
pEEl
If you experience problemsduring
If the unit does not seemto be working right,
FCC WARNING
This equipment may generate or use radio
frequency energy. Changes or modifications
to this equipment may cause harmful
interference unlessthe modificationsare
expresslyapprovedin the instruction manual.
The user could losethe authority to operate
this equipment if an unauthorizedchange or
modificationis made.
installation,consultyour Kenwooddealer.
consult your Kenwooddealer.
Number of
Items
2 English
Cleaningthe unit
If the front panel gets dirty, turn off the power
and wipe the panelwith
a dry siliconcloth or
soft cloth.
I ACAUTION I
Do not wipe the panel with a hardcloth or a
cloth dampenedby volatile solvents such as
paintthinner and alcohol.They can scratch the
surface of the paneland/or cause the indicator
letters to peeloff.
To prevent battery rise
When the unit is used inthe ACC ON position
without turning the engine
ON, it depletesthe
battery. Use it after starting the engine.
Protection function
There is a Protectionfunction installedin the
unit to protect the unit and speakersfrom
various problems.When Protectionoperates,
the indicatorinforms you of the condition.
(Referto page
5)
Accessories
Self-tapping screws
I (04x 16 mm)
lnstallation
Self-tappingscrew
I
(04x 16 mm)
t
I Coolingfan
I
Installationboard, etc.
(thickness
: 15 mmor more)
I
I ACAUTION I
Do not install in the below locations;
(Unstablelocation, In
a locationthat inter
dusty location,In
a place that gets hot, Ir
gets hit by hot air)
Do not installthe unit underthe carpet. (
damaged.
Installthis unit in a locationwhich allows
Once installed, do not place any object
o
The surface temperature of the amplifier
place where people, resins, and other su
contact with it.
This unit has coolingfans to decreasethi
coolingfan openings when installingthe
the internaltemperature and result in mc
When making a hole under a seat, inside
that there is nothing hazardous on the
OF
wiring harness, and be careful not to cau
Do not install near the dashboard, rear trc
The installationto the vehicle should sec
obstruct driving. If the unit comes off dul
cause injuryor an accident.
After installingthe unit, check to make sl
turn signal lampsand windshield wipers
I
I

lning the unit
front panel gets dirty, turn off the power
iipethe panel with a dry silicon cloth or
loth.
:AUTIONI
it wipe the panel with a hard cloth or a
dampened by volatile solvents such as
thinner and alcohol. They can scratch the
:e of the panel and/or cause the indicator
j to peel off.
irevent battery rise
I the unit is used inthe ACC ON position
utturning the engine
ON, it depletes the
y. Use it after starting the engine.
section function
is a Protection function installed in the
I protect the unit and speakers from
is problems. When Protection operates,
dicator informs you of the condition.
rto page
5)
essories
External
View
'art name Number of
Items
lwl I
appingscrews
4 x 16 mm)
rminal cover
aerterminal)
1
ker level input
cable
lnstallation
I
Self-tappingscrew
(04 x 16 my)
Coolingfan
Installation board, etc.
(thickness
: 15 mmor more)
I ACAUTION I
Do not install in the below locations;
(Unstablelocation, In
a location that interferes with driving, In a locationthat gets wet, Ina
dusty location, Ina place that gets hot, Ina place that gets direct sunlight, In
a locationthat
gets hit by hot air)
Do not installthe unit under the carpet. Otherwise heat build-up occurs and the unit may be
damaged.
Installthis 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. Installthe 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 notto block the
cooling fan openings when installing the unit. Blockingthese 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 installationto 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 installingthe unit, check to make sure that electrical equipment such as the brake lamps,
turn signal lamps and windshield wipers operate normally.
I
English 3

Controls / Indicator
6 6
Thisis a 4 channel amplifier including 2
stereo amplifiersin a body. One amplifier is
referred toas amplifier
A and the other is
amplifier B. This unit is compatible with a
large variety of systems by combiningthe
switchesand functionsdescribed in the
following.
@ 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 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.
I NOTE I
For the pre-output level or the maximum
power output, refer tothe "Specifications"
in the instruction manual of the center unit.
Setting this switch to "ON"emphasizes the
bass.
You can use the BASS BOOST for amplifier
B only.
ON position:
OFF position:
@ Bch BASS BOOST switch
BASS BOOST is +6 dB.
BASS BOOST is OFF.
4 English
@ FILTER switch
This switch allows to apply high-pass or
low-pass filtering to the speaker outputs.
0 HPF (High-PassFilter) position:
The filter outputs the band of higher
frequencies than the frequency set with the
FILTER FREQUENCY control.
OFF position:
The entire bandwidth is output without
filtering.
0 LPF (Low-PassFilter) position:
The filter outputs the band of lower
frequencies than the frequency set with the
FILTER FREQUENCY control.
@ OPERATION switch
The amplification methods of the signals
input to amplifiers A and B can be selected
independently according tothe setting of
this switch.
STEREO position:
MONO (Lch)position:
The amplifier can be usedas 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.)
@ INPUT SELECTOR switch
This switch selects the input method of the
signals to be amplified by amplifiers A and
6.
A B position:
A position:
Amplifies both of the signals input to
amplifiers A and 6.
Amplifies only signal input amplifier A with
both amplifiers A and 6.
@ FILTER FREQUENCY control
When the FILTER switch is set tothe H
(High-Pass Filter) or LPF (Low-Pass Filtc
position, the threshold frequency can be
adjusted withthis control.
When the power is turned on, the Powt
indicator lights.
If the Power indicator does not light wh
the power is turned on, the protection
function may be activated. Check whet1
there is any indication of trouble.
@ Power indicator

ILTER switch
lis switch allows to apply high-passor
wpass filtering to the speaker outputs.
iPF(High-Pass Filter)position:
The filter outputsthe band of higher
requenciesthan the frequency set with the
-ILTER FREQUENCYcontrol.
3FF position:
The entire bandwidthis output without
.iltering.
LPF (Low-Pass Filter)position:
The filter outputsthe band of lower
'requenciesthan the frequency set with the
-ILTER FREQUENCYcontrol.
'PERATIONswitch
ieamplification methods of the signals
putto amplifiers
A and B can be selected
dependentlyaccordingto the setting of
is switch.
STEREO position:
The amplifiercan be usedas a stereo
jmplifier.
MONO (Lch) position:
4mplifiesthe signal inputfrom the left side
mly. Set tothis positionand make bridged
Zonnectionsto use as
a high-power
nonauralamplifier. (Theinputright signal is
lotoutput.)
UPUT SELECTOR switch
iis switch selects the input method of the
gnals to be amplified by amplifiers
A and
A B position:
4mplifies bothof the signals inputto
amplifiers
A and B.
A position:
4mplifiesonlysignal inputamplifier A with
bothamplifiers
A and B.
0 FILTER FREQUENCY control
When the FILTER switch is set to the HPF
(High-PassFilter)or LPF (Low-PassFilter)
position, the threshold frequency can be
adjustedwith this control.
When the power is turned on, the Power
indicator lights.
If the Power indicatordoes not light when
the power is turned on, the protection
function may be activated. Check whether
there is any indicationof trouble.
0 Power indicator
Theprotection function is
activated in the following
situations:
This unit is equippedwith a protection
function for protecting this unit and your
speakers from various accidents or
problemsthat can occur.
When the protectionfunctionistriggered, the
Powerindicatorgoes
off and the amplifier
stopsoperating.
When a speakerwire may be short-
When a speaker output contacts ground.
When the unit malfunctions and a DC
signalis sent to the speaker output.
When the internaltemperature is high and
unit won't operate.
When a groundwire of the center unit
(cassette receiver, CD receiver, etc.) or
this unit is not connected to
a metal part
servingas an electrical ground passing
electricity to the battery's negative
@
terminal.
circuited.
English 5