KAC-X41
FOUR CHANNEL POWER AMPLIFIER
INSTRUCTION MANUAL
© B64-4200-00/00 (MV)
Installation
Accessories
Part name
External View Number of Items
380 mm
320 mm
Self-tapping screws
(ø5 × 18 mm)
4
ø6
Hexagon Wrench (Large)
Hexagon Wrench (Small)
1
1
1
Terminal cover (Power terminal)
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. Remove the Dressing cover.
4. Connect the input and output wires of the units.
5. Connect the speaker wires.
6. Connect the power wire, power control wire and grounding wire following
this order.
7. Install the installation fittings in the unit.
8. Attach the unit.
9. Attach the Dressing cover.
Hexagon Wrench
(Small)
Hexagon socket
head cap screw
(M4 × 8 mm)
10. Connect the negative · terminal of the battery.
Dressing cover
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.
• 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.
Cooling fan
Installation board, etc.
(thickness : 15 mm or more)
Self-tapping screw
(ø5 × 18 mm)
English ꢁ
Connection
WARNING
Remove the ignition key and
disconnect the negative · terminal of
the battery to prevent short circuits.
RCA cable*
CENTER UNIT
(CD receiver, etc.)
NOTE
Hexagon Wrench
(Small)
Use a RCA cable
with a straight
terminal. If a RCA
cable with L type
terminal is used, it
may not be able to
connect.
Power control wire*
Use the
attached
Hexagon
Wrench.
CAUTION
• If sound is not output normally, immediately
turn power off and check connections.
• Be sure to turn the power off before
Left input
changing the setting of any switch.
Hexagon Wrench
LEFT
RIGHT
LEFT
RIGHT
BATT.
GND
• If the fuse blows, check wires for shorts, then
(Small)
L
replace the fuse with one of the same rating.
R
• 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.
2]
PN
BRED
SPEAKEOUTPUT
BRIED
PEAKER OUTUT
A
B
+
B
A
B
LINE IN
LINE OUT
Right input
Hexagon
A channel input
Wrench (Large)
B channel input
Use the
attached
Hexagon
Wrench.
• After installation, check that the brake
lamps, winkers, and wipers work properly.
Battery wire*
Protective Fuse*
B channel
Right speaker
B channel
Left speaker
* Commercially available parts
A channel
Terminal cover
Ground wire*
Right speaker
WARNING
A channel
Left speaker
To prevent fire caused by a short in the
wiring, connect a fusible link or breaker
nearby the battery’s positive terminal.
Battery
LEFT
RIGHT
LEFT
RIGHT
Bridged Connections
BRIDGED
PEAKER OUTUT
BRIDGED
PEAKER OUTPUT
A
B
B channel
Speaker (Bridged)
A channel
Speaker (Bridged)
About the Lead Terminals
1. Wire Thicknesses
You can use wires with the following thicknesses:
Hexagon
Wrench
(Large)
Battery wire and ground wire
Speaker wire
AWG 4 – AWG 6
AWG 8 – AWG 12
10 - 13 mm
(3/8" - 1/2")
Hexagon Wrench
(Small)
2. Strip the wire
Make a cut in the wire sheath (insulator made from vinyl, etc.) at the
position 10-13 mm away from the end of the wire, and then remove the
unnecessary portion of the sheath by twisting it.
3. Install the wire
Loosen the screw using the supplied hexagon wrench. Insert the
conductor of the wire in the terminal hole, and then tighten the screw.
ꢂ English
System examples
ꢂ-channel system
High-power ꢀ-channel system
L
L
L
Front Left speaker
Front Right speaker
Left speaker (Bridged)
Right speaker (Bridged)
L
L
A
B
A
B
CENTER UNIT
CENTER UNIT
R
R
R
R
L
L
R
Rear Left speaker
Rear Right speaker
L
L
R
R
R
R
6
6
60
60
1
70
1
70
1
70
1
70
100
100
100
100
4
4
0
10
15
10
15
70
80
70
80
50
50
2
2
2
2
0.5
0.3
0.5
0.3
0.5
0.3
2
0.5
0.3
2
60
60
60
60
150
150
200
150
150
200
3
4
3
3
3
90
100
BASS BOOST
90
100
BASS BOOST
4
4
4
]
[
]
[
]
50
200
[
]
[
]
40
0
18
50
[
]
[
]
50
200
[
[
]
40
18
50
MIN
MAX
MIN
MAX
MIN
MAX
MIN
MAX
5
0.2
5
0.2
5
0.2
5
0.2
INPUT
SENSITIVITY
HPF/LPF
INPUT
BASS BOOST
LEVEL dB
HPF/LPF
FREQUENCY Hz
INPUT
SENSITIVITY
HPF/LPF
INPUT
BASS BOOST
LEVEL dB
HPF/LPF
[
[
]
V
[
]
[
]
V
[
]
[
]
[
]
[
]
V
[
]
[
]
V
[
]
[
]
]
FREQUENCY Hz
FREQUENCY Hz SENSITIVITY
FREQUENCY Hz
FREQUENCY Hz SENSITIVITY
FREQUENCY Hz
A ch
B ch
A ch
B ch
INPUT
A ch
B ch
INPUT
A ch
B ch
SELECTOR OPERATION FILTER
FILTER
SELECTOR OPERATION FILTER
FILTER
A
MONO
HPF
LPF
HPF
A
MONO
HPF
LPF
HPF
[
]
[
]
Lch
Lch
OFF
OFF
OFF
OFF
A
B
A
B
STEREO
LPF
STEREO
LPF
ꢀ-channel + Subwoofer system (1)
ꢀ-channel + Subwoofer system (ꢀ)
Left speaker (High pass)
Right speaker (High pass)
L
L
L
L
Left speaker (High pass)
Right speaker (High pass)
A
B
A
B
CENTER UNIT
CENTER UNIT
R
R
R
R
L
L
L
L
Subwoofer
(Bridged)
Subwoofer
(Bridged)
R
R
R
R
6
6
60
60
1
70
1
70
1
70
1
70
100
100
100
100
4
0
4
0
10
15
10
15
70
80
70
80
50
50
2
2
2
2
0.5
0.3
0.5
0.3
0.5
0.3
2
0.5
0.3
2
60
60
60
60
150
150
200
150
150
200
3
4
3
3
4
3
90
100
BASS BOOST
90
100
BASS BOOST
4
4
[
]
[
]
50
200
[
]
[
]
40
18
50
[
]
[
]
50
200
[
]
[
]
40
18
50
MIN
MAX
MIN
MAX
MIN
MAX
MIN
MAX
5
0.2
5
0.2
5
0.2
5
0.2
INPUT
SENSITIVITY
HPF/LPF
INPUT
BASS BOOST
LEVEL dB
HPF/LPF
FREQUENCY Hz
INPUT
SENSITIVITY
HPF/LPF
INPUT
BASS BOOST
LEVEL dB
HPF/LPF
[
[
]
V
[
]
[
]
V
[
]
[
]
[
]
[
]
V
[
]
[
]
V
[
]
[
]
]
FREQUENCY Hz
FREQUENCY Hz SENSITIVITY
FREQUENCY Hz
FREQUENCY Hz SENSITIVITY
FREQUENCY Hz
A ch
B ch
A ch
B ch
INPUT
A ch
B ch
INPUT
A ch
B ch
SELECTOR OPERATION FILTER
FILTER
SELECTOR OPERATION FILTER
FILTER
A
MONO
HPF
LPF
HPF
A
MONO
HPF
LPF
HPF
[
]
[
]
Lch
Lch
OFF
OFF
OFF
OFF
A
B
A
B
STEREO
LPF
STEREO
LPF
English ꢃ
Controls
ꢈ
ꢌ
Z
ꢇ
6
60
1
70
1
70
50
100
100
4
10
15
70
80
50
2
2
0.5
0.5
0.3
2
60
60
150
150
200
3
3
90
100
BASS BOOST
0.3
4
4
]
[
]
[
]
50
200
[
[
]
40
0
18
MIN
5
0.2 MAX
MIN
5
0.2 MAX
INPUT
SENSITIVITY
HPF/LPF
INPUT
BASS BOOST
LEVEL dB
HPF/LPF
[
[
]
V
[
]
[
]
V
[
]
[
]
]
FREQUENCY Hz SENSITIVITY
FREQUENCY Hz
FREQUENCY Hz
A
ch
B
ch
INPUT
A
ch
B
ch
SELECTOR OPERATION FILTER
FILTER
HPF
A
MONO
HPF
[
]
Lch
OFF
OFF
A
B
STEREO
LPF
LPF
ꢋ
ꢊ
ꢉ
ꢍ ꢎ
ꢏ
NOTE
The control panel locates under the front side cover. Remove
the cover to access to its controls for adjustment. (See page 3)
THERMAL MANAGEMENT
PROTECTION
LEFT
RIGHT
LEFT
RIGHT
BATT.
GND
L
R
[
x ]
2
BRIDGED
SPEAKER OUTPUT
BRIDGED
SPEAKER OUTPUT
A
B
A
+
B
FUSE 40A
P.CON
LINE IN
LINE OUT
A
B
ꢀ
ꢁ
ꢂ
ꢃ
ꢄ
ꢅ
ꢆ
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.
They always output the stereo signals regardless
of the position of the "OPERATION" switch.
# OPERATION switch
The amplification methods of the signals input
can be selected.
8 THERMAL MANAGEMENT indicator
Lights this indicator when the internal
temperature is high.
• STEREO position:
The amplifier can be used as a stereo amplifier.
• MONO (Lch) position:
9 PROTECTION indicator
1 Fuse (ꢂ0 A x ꢀ)
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.)
Lights this indicator when the protection function
is activated. (See page 2)
NOTE
If you can’t find the specified capacity fuse at your
store etc., consult your Kenwood dealer.
0 Power indicator
When the power is turned on, the Power indicator
lights.
$ FILTER switch (A.ch/B.ch)
2 Battery terminal
This switch allows to apply high-pass or low-pass
filtering to the speaker outputs.
- INPUT SENSITIVITY control (A.ch/B.ch)
Set this control according to the pre-output level
of the center unit connected with this unit.
The sensitivities of amplifiers A and B can be
adjusted independently regardless of the position
of the input selector switch.
3 Power control terminal
Controls the unit ON/OFF.
• HPF (High-Pass Filter) position:
The filter outputs the band of higher frequencies
than the frequency set with the "HPF
FREQUENCY" control.
NOTE
Controls the unit power. Be sure to connect it with
all the systems.
• OFF position:
4 Ground terminal
NOTE
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 "LPF
FREQUENCY" control.
The speaker output is automatically switched to
monaural (L+R).
5 Speaker output terminals (A.ch/B.ch)
For the pre-output level, refer to the
<Specifications> in the instruction manual of the
center unit.
• 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 2Ω or greater. When multiple
speakers are to be connected, ensure that the
combined impedance is 2Ω or greater for each
channel.
= HPF/LPF FREQUENCY control (A.ch/
B.ch)
Sets the cutoff frequency when the "FILTER"
switch is set to "HPF" or "LPF".
~ BASS BOOST FREQUENCY control (B.ch)
Sets the center frequency around which the low
frequency range should be boosted.
• 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.)
! BASS BOOST LEVEL control (B.ch)
Sets the level by which the low frequency range
should be boosted.
@ INPUT SELECTOR switch
The speakers to be connected should have an
impedance of 4Ω or greater. When multiple
speakers are to be connected, ensure that the
combined impedance is 4Ω or greater.
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.
6 LINE IN terminal (A.ch/B.ch)
• A position:
7 LINE OUT terminal
Amplifies only signal input amplifier A with both
amplifiers A and B.
These jacks output respectively the signals input
to amplifiers A and B.
ꢄ English
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
No sound.
(Blown fuse.)
POSSIBLE CAUSE
SOLUTION
• Input (or output) cables are disconnected.
• Protection circuit may be activated.
• Volume is too high.
• Connect the input (or output) cables.
• Check connections by referring to <Protection function>.
• Replace the fuse and use lower volume.
• After check the speaker cord and fixing the cause of the short,
replace the fuse.
• The speaker cord is shorted.
The output level is too small • The input sensitivity adjusting control is not set to the correct • Adjust the control correctly referring to <Controls>.
(or too large).
The sound quality is bad.
(The sound is distorted.)
position.
• The speakers wire are connected with wrong ª / · polarity. • Connect them properly checking the ª / · of the terminals
and wires well.
• A speaker wire is pinched by a screw in the car body.
• The switches may be set improperly.
• Connect the speaker wire again so that it is not pinched by
anything.
• Set switches properly by referring to <Controls>.
Specifications
Specifications subject to change without notice.
Audio Section
Max Power Output.........................................................................................................................................................................................................................................1200 W
Rated Power Output (+B = 14.4 V)
Normal (4 Ω) (20 Hz – 20 kHz, 0.05 % THD).................................................................................................................................................................100 W × 4
(2 Ω) (1 kHz, 0.5 % THD)........................................................................................................................................................................................150 W × 4
Bridged (4 Ω) (1 kHz, 0.5 % THD).......................................................................................................................................................................................300 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
Input Impedance............................................................................................................................................................................................................................................... 10 kΩ
Signal to Noise Ratio......................................................................................................................................................................................................................................105 dB
Low Pass Filter Frequency (-12 dB/oct.)...............................................................................................................................................................50 – 200 Hz (variable)
High Pass Filter Frequency (-12 dB/oct.) .............................................................................................................................................................50 – 200 Hz (variable)
Bass Boost Level (B channel)........................................................................................................................................................................................0 – +18 dB (variable)
Bass Boost Frequency (B channel)..........................................................................................................................................................................40 – 100 Hz (variable)
Bass Boost Frequency...................................................................................................................................................................................................................................................
General
Operating Voltage .............................................................................................................................................................................................. 14.4 V (11 – 16 V allowable)
Current Consumption ........................................................................................................................................................................................................................................64 A
Installation Size (W × H × D) .........................................................................................................................................................................................380 × 66 × 286 mm
Weight .....................................................................................................................................................................................................................................................................4.9 kg
Weight ..................................................................................................................................................................................................................................................................................
English ꢅ
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