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© B64-3356-00/00 (MV)
STEREO/BRIDGEABLE POWER AMPLIFIER
KAC-6203
INSTRUCTION MANUAL


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2 English
Safety precautions
2 WARNING
To prevent injury or fire, take the following
precautions:
· When extending the ignition, battery, or ground
wires, make sure to use automotive-grade wires
or other wires with a 5 mm² (AWG 10) or more to
prevent wire deterioration and damage to the wire
coating.
· To prevent a short circuit, never put or leave any
metallic objects (such as coins or metal tools) inside
the unit.
· If the unit starts to emit smoke or strange smells,
turn off the power immediately and consult your
Kenwood dealer.
· Do not touch the unit during use because the
surface of the unit becomes hot and may cause
burns if touched.
2 CAUTION
To prevent damage to the machine, take the
following precautions:
· Be sure the unit is connected to a 12V DC power
supply with a negative ground connection.
· Do not open the top or bottom covers of the unit.
· Do not install the unit in a spot exposed to direct
sunlight or excessive heat or humidity. Also avoid
places with too much dust or the possibility of water
splashing.
· When replacing a fuse, only use a new one with the
prescribed rating. Using a fuse with the wrong rating
may cause your unit to malfunction.
· To prevent a short circuit when replacing a fuse, first
disconnect the wiring harness.
NOTE
· If you experience problems during installation,
consult your Kenwood dealer.
· If the unit does not seem to be working right,
consult your Kenwood dealer.
Cleaning the unit
If the front panel gets dirty, turn off the power and
wipe the panel with a dry silicon cloth or soft cloth.
2 CAUTION
Do not wipe the panel with a hard cloth or a cloth
dampened by volatile solvents such as paint thinner
and alcohol. They can scratch the surface of the panel
and/or cause the indicator letters to peel off.
To prevent battery rise
When the unit is used in the ACC ON position without
turning the engine ON, it depletes the battery. Use it
after starting the engine.
Protection function
There is a Protection function installed in the unit to
protect the unit and speakers from various problems.
When Protection operates, the indicator informs you
of the condition. (Refer to page 5)
Accessories
Part name
External
View
Number of
Items
Self-tapping screws
(ø4 × 16 mm)
4
Terminal cover (Power
terminal)
1
Speaker level input
cable
1


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English
3
Installation
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.
Installation board, etc.
(thickness : 15 mm or more)
Self-tapping screw
(ø4 × 16 mm)
Ø4.6
230
mm
244
mm
204 mm
330 mm
254
mm


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4 English
Controls / Indicator
(W)
30
40
20
10
1
2
2
1 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:
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.
2 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.
Use the diagram on the right as a guide.
NOTE
For the pre-output level or the maximum power
output, refer to the <Specifications> in the
instruction manual of the center unit.
3 Power indicator
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.


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English
5
The protection function is activated in
the following situations:
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.
· 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.
3