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KAC-PS401M
© B64-1441-00 (EM)
MONO POWER AMPLIFIER
INSTRUCTION MANUAL


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2 English
Safety precautions
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 cables of the
units.
4. Connect the speaker cables and sigma servo
feed back cables.
5. Connect the power cable, power control
cable and grounding cable following this
order.
6. Install the unit in the car.
7. Connect the negative - terminal of the
battery.
· If sound is not output normally, immediately
turn power off and check connections. Be
sure to perform the sigma servo connection
correctly.
· Be sure to make correct connections of the
sigma servo terminals.
· Be sure to turn the power off before
changing the setting of any switch.
· If the fuse blows, check cables for shorts,
then replace the fuse with one of the same
rating.
· Check that no unconnected cables or
connectors are touching the car body. Do
not remove caps from unconnected cables
or connectors to prevent short circuits.
2CAUTION
To prevent injury or fire, take the following
precautions:
· When extending the ignition, battery, or
ground cables, make sure to use automotive-
grade cables or other cables with a 5mm
2
(AWG10) or more to prevent cable
deterioration and damage to the cable
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.
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.
· 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.
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.
Accessories
2CAUTION
NOTE
2CAUTION
2WARNING
Part name
Number of
Items
External
View
Terminal cover
(Power terminal)
1
Self-tapping screws
(ø5
× 18 mm)
4


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English
3
Installation
· Since the power amplifier has no parts which require operation, it can be installed at a position
away from the driver's seat without any hindrances.
As generally accepted positions for its installation, places such as inside the trunk, etc. can be
considered.
· Use the extension cables. (Optional.)
· 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.
2CAUTION
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Installation board, etc.
(thickness : 15 mm or more)
Self-tapping screw
CA-2SL
CA-12SL
CA-22SL
CA-52SL
RCA cable
CA-3WL
CA-13WL
CA-23WL
CA-53WL
RCA cable (ø7mm)
CA-5W
CA-15W
CA-25W
CA-45W
CA-65W
RCA cable (ø12mm)
0.5m
1m
2m
4m
5m
6m
Type
Length
Cooling fan
Air inlet
Air inlet
Installation procedure
· Connect the speaker cables to appropriate
speaker connectors separately. Sharing the
negative cable of the speaker or grounding
speaker cables 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.


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4 English
Controls
L
L
R
R
OUT
LINE IN
P.CON
GND
EXT.AMP.CONT.
30
15
20 25
ON
OFF
ON
OFF
ON
OFF
INFRASONIC
BAND
REJECT
LPF
FREQ (Hz)
B.M.S.
B.M.S.
(
+6)
B.M.S.
(REMOTE)
CLOSE
OPEN/
SPEAKER OUTPUT
FUSE(15A
×4 )
­
+
­
+
BATT.
GND
15
15
15
15
SERVO II
FEED BACK
1
4
5
2 3
67
8 90
30
15
20 25
ON
OFF
ON
OFF
ON
OFF
INFRASONIC
BAND
REJECT
LPF
FREQ (Hz)
(MIN)
(MAX)
5
4
3
2
1
0.5
0.2
50
40
200
200
INPUT
SENSITIVITY
B.R.F.
FREQUENCY
LO PASS
FREQUENCY
&$
^@
#
!
%
0.5
1
Fuse (15 A
× 4)
2
Battery terminal
3
Ground terminal
4
SPEAKER OUTPUT terminals
As this unit accepts speakers with a
minimum impedance of 2 ohms, connect
speakers with 2-ohm or higher impedance
to these terminals.
The rated input of the speakers should be
no less than the maximum output of the
amplifier. Otherwise malfunction may
result.
5
SIGMA SERVO FEED BACK
terminals (See p.11)
Be sure to make proper connections to the
SIGMA SERVO FEED BACK terminals.
Incorrect connection may result in lack of
sound output or other malfunctions.
6
RCA cable ground lead terminal
7
LINE IN terminal
8
LINE OUT terminal
9
Power control terminal
0
EXT.AMP.CONT. (external
amplifier control) terminal
This controls the B.M.S. (See P.6).
!
INPUT SENSITIVITY control
Adjust this control according to the pre-out
level of the centre unit connected to this
amplifier.
Refer to "Specifications" on the centre
unit's instruction manual about the pre-out
level.
@
Low Pass Filter switch
When this switch is set to ON, the bass is
boosted because the frequencies of the
lower frequency band than the cutoff
frequency set with the LPF FREQUENCY
control are output.
#
LPF FREQUENCY control
Sets the cutoff frequency when the FILTER
switch is set to LPF.
$
BAND REJECT filter switch
When this switch is set to ON, frequencies
in the band set with the BAND REJECT
FREQUENCY control are rejected and
eliminated. The band rejection allows to
reduce resonance inside the vehicle
compartment and standing waves. (See
P.12)
%
BAND REJECT FREQUENCY
control
Sets the rejection frequency when the
BAND REJECT switch is set to ON.
(See P.12)
^
INFRASONIC FILTER switch
When this switch is set to ON, the
inaudible, ultralow frequencies below the
frequency set with the INFRASONIC
FILTER FREQUENCY switch are cut off.
This improves the reproduction
performance of the speakers by eliminating
unnecessary oscillations which will not
become sound.
&
INFRASONIC FILTER FREQUENCY
switch
Switches the cutoff frequency when the
INFRASONIC FILTER switch is set to ON.
NOTE
2CAUTION
2CAUTION


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*
POWER indicator
This indicator glows when the unit's power
is turned ON.
(
COOLING FAN indicator
When the unit's internal temperature rises,
the slide panel opens automatically and the
cooling fan is activated.
The cooling fan is also activated when the
slide panel is opened.
Whilst the cooling fan is in operation, the
COOLING FAN indicator blinks.
)
OPERATION/PROTECTION
indicator
This indicator glows when the power
comes ON normally.
If the PROTECTION function is activated,
the indicator blinks or goes out.
@1
LOW VOLTAGE indicator
This indicator glows when the power
voltage falls below 11V (volts).
If the power supply voltage returns to full
after a voltage drop, this indicator will blink
to alert the user that a voltage drop has
occurred.
The number of blinks indicates the number
of times the voltage has dropped (up to a
maximum of 10).
@2
B.M.S. indicator
This indicator glows when the bass boost is
turned ON using the B.M.S. (See P.6).
If indicators !9 to @2 light up in succession or
blink in unison, the system is in DEMO mode.
If this happens, cancel DEMO mode by
pressing the OPEN/CLOSE button.
s PROTECTION function
This unit incorporates a protection function
which protects the main unit and speakers
from troubles. The unit stops to function
when the protection function is activated.
· When the OPERATION/
PROTECTION indicator blinks:
· A speaker cable may be short-circuited.
· A speaker output may be in contact with
the ground.
· The temperature of the internal parts may
be higher than 120°C (248°F)
· The fuse of this unit may be blown.
· The unit may be malfunctioning and
sending DC signal to the speaker output.
· The sigma servo connection may be
erroneous.
Cancelling: turn the accessory power
source (ACC) OFF, then back ON.
· When the POWER indicator and the
OPERATION/PROTECTION function
both go out:
· The fuse of this unit may be blown.
· When the LOW VOLTAGE indicator
glows or blinks:
· Is the battery exhausted?
· The car battery has a small capacity.
· If the battery cable is too thin or too long,
it will not be able to supply enough
power.
· Is the battery cable deteriorated?
NOTE
English
5
e Xce l on
AIR
INDUCTION
COOLING FAN
OPERATION/PROTECTION
OPEN/CLOSE
LOW VOLTAGE
B.M.S.
(MIN)
(MAX)
5
4
3
2
1
0.5
0.2
50
100
50
40
200
200
B.M.S.
FREQUENCY
INPUT
SENSITIVITY
B.R.F.
FREQUENCY
LO PASS
FREQUENCY
POWER
AIR
INDUCTION
COOLING FAN
OPERATION/PROTECTION
OPEN/CLOSE
LOW VOLTAGE
B.M.S.
(MIN)
(MAX)
5
4
3
2
1
0.5
0.2
50
100
50
40
200
200
B.M.S.
FREQUENCY
INPUT
SENSITIVITY
B.R.F.
FREQUENCY
LO PASS
FREQUENCY
POWER
MONO POWER AMPLIFIER
COOLING FAN
OPERATION/PROTECTION
OPEN/CLOSE
LOW VOLTAGE
B.M.S.
*
(
)
@1
@2