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KAC-X40
FOUR CHANNEL POWER AMPLIFIER
7 page 2-7
INSTRUCTION MANUAL
AMPLIFICATEUR 4 CANAUX
7 page 8-13
MODE D'EMPLOI
AMPLIFICADOR DE POTENCIA DE CUATRO CANALES
7 página 14-19
MANUAL DE INSTRUCCIONES
© B64-3520-00/00 (KV)
Take the time to read through this instruction manual. Familiarity
with installation and operation procedures will help you obtain the
best performance from your new power amplifier.
For your records
Record the serial number, found on the back of the unit, in the spaces
designated on the warranty card, and in the space provided below. Refer
to the model and serial numbers whenever you call upon your Kenwood
dealer for information or service on the product.
Model KAC-X40 Serial number
US Residence Only
Register Online
Register your Kenwood product at
w w w.kenwoodusa.com


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2 English
Safety precautions
2WARNING
To prevent injury or fire, take the following precautions:
· Mounting and wiring this product requires skills and experience. For safety's
sake, leave the mounting and wiring work to professionals.
· When extending the ignition, battery, or ground wires, make sure to use
automotive-grade wires or other wires with a 8 mm2 (AWG 8) 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.
2CAUTION
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.
FCC WARNING
This equipment may generate or use radio frequency energy. Changes or
modifications to this equipment may cause harmful interference unless the
modifications are expressly approved in the instruction manual. The user could
lose the authority to operate this equipment if an unauthorized change or
modification is made.
FCC NOTE
This equipment has been tested and found to comply with the limits for a
Class B digital device, pursuant to Part 15 of the FCC Rules. These limits are
designed to provide reasonable protection against harmful interference in
a residential installation. This equipment may cause harmful interference to
radio communications, if it is not installed and used in accordance with the
instructions. However, there is no guarantee that interference will not occur in a
particular installation. If this equipment does cause harmful interference to radio
or television reception, which can be determined by turning the equipment off
and on, the user is encouraged to try to correct the interference by one or more
of the following measures:
· Reorient or relocate the receiving antenna.
· Increase the separation between the equipment and receiver.
· Connect the equipment into an outlet on a circuit different from that to which
the receiver is connected.
· Consult the dealer or an experienced radio/TV technician for help.
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.
2CAUTION
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
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.
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.
· 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 diameter of 8 mm2 (AWG 8) 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.
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.
· Use speakers that have an impedance of 2 or greater. 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.
8
2
4
4
4
4
Combined impedance


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English
3
Installation
Accessories
Part name
External View
Number of Items
Self-tapping screws
(ø5 × 18 mm)
4
Terminal cover (Power terminal)
1
Hexagon Wrench
1
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.
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 installation fittings in the unit.
7.Attach the unit.
8.Connect the negative
- terminal of the battery.
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 fan to decrease the internal temperature. Do not
mount the unit in a place where the cooling fan and ducts of the unit are
blocked. 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.
380 mm
320 mm
Ø6
272
mm
286
mm
Installation board, etc.
(thickness : 15 mm or more)
Self-tapping screw
(ø5 × 18 mm)
Hexagon socket
head cap screw
(M4 × 12 mm)
Hexagon Wrench
Dressing cover
Cooling fan


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4 English
25
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.
* Commercially available parts
Connection
Lead terminal*
Ground wire*
Power control wire
B channel
Right speaker
Battery wire*
Protective Fuse*
Terminal cover
CENTER UNIT
(CD receiver, etc.)
RCA cable*
Left input
Right input
Battery
Bridged Connections
B channel
Left speaker
A channel
Right speaker
A channel
Left speaker
B channel
Speaker (Bridged)
A channel
Speaker (Bridged)
A channel input
B channel input


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English
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R
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R
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R
L
R
A
B
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R
L
R
L
R
L
R
A
B
L
R
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A
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R
A
B
System examples
CENTER UNIT
4-channel system
High-power 2-channel system
Right speaker (Bridged)
Left speaker (Bridged)
2-channel + Subwoofer system (1)
Subwoofer
(Bridged)
CENTER UNIT
CENTER UNIT
Right speaker (High pass)
Left speaker (High pass)
Front Right speaker
Front Left speaker
Rear Right speaker
Rear Left speaker
2-channel + Subwoofer system (2)
Subwoofer
(Bridged)
CENTER UNIT
Right speaker (High pass)
Left speaker (High pass)