Kenwood KAC-6401 Instruction Manual

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 POSSIBLE CAUSE SOLUTION
No sound. • Input (or output) cables are • Connect the input (or output)
(No sound from one side.) disconnected. cables.
• Protection circuit may be • Check connections by referring
activated. to "Power indicator".
(Blown fuse.) • Volume is too high. • Replace the fuse and use lower
volume.
• The speaker cord is shorted. • After check the speaker cord and
fixing the cause of the short,
replace the fuse.
The output level is too The input sensitivity adjusting Adjust the control correctly
small (or too large). control is not set to the correct referring to "Controls".
position.
The sound quality is bad. • The speakers wire are • Connect them properly checking
(The sound is distorted.) connected with wrong + / - the + / - of the terminals and
polarity. wires well.
• A speaker wire is pinched by a • Connect the speaker wire again
screw in the car body. so that it is not pinched by
anything.
• The switches may be set • Set switches properly by
improperly. referring to "System examples".
Specifications
Specifications subject to change without notice.
Audio Section
Max Power Output....................................................................................................................160 W × 2
Rated Power Output (4 Ω)
4 Channel Mode (20 Hz – 20 kHz, less than 0.08 % THD) .......................................................30 W × 4
3 Channel Mode (20 Hz – 20 kHz, 0.08 % THD) + (1 kHz, 0.8 % THD) ................30 W × 2 + 80 W × 1
2 Channel Mode (1 kHz, 0.8 % THD) .......................................................................................80 W × 2
Rated Power Output (2 Ω)
4 Channel Mode (1 kHz, 0.8 % THD) .......................................................................................40 W × 4
Frequency Response (+0, –3 dB) ........................................................................................5 Hz – 50 kHz
Signal to Noise Ratio ......................................................................................................................100 dB
Sensitivity (MAX) (rated output).........................................................................................................0.2 V
Sensitivity (MIN) (rated output)..........................................................................................................5.0 V
Input Impedance ..............................................................................................................................10 kΩ
Low Pass Filter Frequency (12 dB/oct.)............................................................................................80 Hz
High Pass Filter Frequency (12 dB/oct.) .........................................................................................150 Hz
General
Operating Voltage (11 – 16 V allowable)..........................................................................................14.4 V
Current Consumption (1 kHz, 10 % THD) ..........................................................................................18 A
Dimensions (W × H × D).............................................................................................268 × 59 × 220 mm
Weight................................................................................................................................2.9 kg (6.4 lbs)
■ Wiring
Safety precautions
• If a buzzing noise is heard from the speakers
when the engine is running, connect a line noise
2WARNING
filter (optional) to each of the battery wire.
To prevent injury or fire, take the following
• Do not allow the wire to directly contact the edge
precautions:
of the iron plate by using Grommets.
• When extending the ignition, battery, or ground • Connect the ground wire to a metal part of the
wires, make sure to use automotive-grade wires or car chassis that acts as an electrical ground
other wires with a 3mm 2 (AWG12) or more to passing electricity to the battery's negative -
prevent wire deterioration and damage to the wire terminal. Do not turn the power on if the ground
coating. wire is not connected.
• Connect the power cable directly to the battery.
• To prevent a short circuit, never put or leave any
It can cause blown fuses if you connect to the
metallic objects (such as coins or metal tools) inside
vehicle wring harness.
the unit.
• Be sure to install a protective fuse in the power
• If the unit starts to emit smoke or strange smells,
cord near the battery. The protective fuse should
turn off the power immediately and consult your
be the same capacity as the unit's fuse capacity
Kenwood dealer.
or somewhat larger.
• Do not touch the unit during use because the surface
• For the power cord and ground, use a vehicle
of the unit becomes hot and may cause burns if
type (fireproof) power wring cord with a current
touched.
capacity greater than the unit's fuse capacity.
(Use a power wiring cord with a diameter of 3
2CAUTION
mm 2 (AWG 12) or greater.)
To prevent damage to the machine, take the
• When more than one power amplifier are going
following precautions:
to be used, use a power supply wiring wire and
• Be sure the unit is connected to a 12V DC power
protective fuse of greater current-handling
supply with a negative ground connection. capacity than the total maximum current drawn
• Do not open the top or bottom covers of the unit. by each amplifier.
• Do not install the unit in a spot exposed to direct
■ Speaker Selection
sunlight or excessive heat or humidity. Also avoid
• The rated input power of the speakers that are
places with too much dust or the possibility of water
going to be connected should be greater than
splashing.
the maximum output power (in Watts) of the
• When replacing a fuse, only use a new one with the
amplifier. Use of speakers having input power
prescribed rating. Using a fuse with the wrong rating
ratings that are less than the output power of
may cause your unit to malfunction.
the amplifier will cause smoke to be emitted as
• To prevent a short circuit when replacing a fuse, first
well as damage.
disconnect the wiring harness.
• The impedance of the speakers that are going to
be connected should be 2Ω or greater (for
NOTE
stereo connections), or 4Ω or greater (for
• If you experience problems during installation,
bridged connections). When more than one set
consult your Kenwood dealer.
of speakers are going to be used, calculate the
• If the unit does not seem to be working right, consult
combined impedance of the speakers and then
your Kenwood dealer.
connect suitable speakers to the amplifier.
■ Cleaning the unit
If the front panel gets dirty, turn off the power and
4Ω
wipe the panel with a dry silicon cloth or soft cloth.
2CAUTION 4Ω
8 Ω 2 Ω
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.
KAC-6401
4-CHANNEL POWER AMPLIFIER
INSTRUCTION MANUAL
4 通道放大器
使用說明書
© B64-2568-00/00 (MV)
■ Accessories
Installation procedure
Part name
1. Remove the ignition key and disconnect the
negative - terminal of the battery to prevent
Terminal cover
short circuits.
(Power terminal)
2. Set the unit according to the intended usage.
3. Connect the input and output cables of the Self-tapping screws
(ø4 × 16 mm)
units.
4. Connect the speaker wires.
Speaker level input
5. Connect the power wire, power control wire
cable
and grounding wire following this order.
6. Install the unit in the car.
Installation
7. Connect the negative - terminal of the battery.
2WARNING
Since the power amplifier has no parts which require
To prevent fire caused by a short in the wiring,
operation, it can be installed at a position away from
connect a fusible link or breaker nearby the
the driver's seat without any hindrances.
battery's positive terminal.
As generally accepted positions for its installation,
2CAUTION
places such as inside the trunk, etc. can be
considered.
• Be sure to turn the power off before changing the
setting of any switch. 2CAUTION
• If the fuse blows, check wires for shorts, then
• Do not install the unit under the carpet. Otherwise
replace the fuse with one of the same rating.
heat build-up occurs and the unit may be damaged.
• Check that no unconnected cables or connectors
• Install this unit in a location which allows heat to
are touching the car body. Do not remove caps from
easily dissipate. Once installed, do not place any
unconnected cables or connectors to prevent short
object on top of the unit.
circuits.
• The surface temperature of the amplifier will
• Connect the speaker wires to appropriate speaker
become hot during use. Install the amplifier in a
connectors separately. Sharing the negative wire of
place where people, resins, and other substances
the speaker or grounding speaker wires to the metal
that are sensitive to heat will not come into contact
body of the car can cause this unit to fail.
with it.
• After installation, check that the brake lamps,
• When making a hole under a seat, inside the trunk,
winkers, and wipers work properly.
or somewhere else in the vehicle, check that there
■ Speaker level input terminals (0)
is nothing hazardous on the opposite side such as a
• The genuine-accessory car stereo shall have a gasoline tank, brake pipe, or wiring harness, and be
maximum power output of no more than 40 W. careful not to cause scratches or other damage.
• Do not install near the dashboard, rear tray, or air
• Do not connect the speaker output leads from
a power amplifier (Optional) to the speaker bag safety parts.
level input terminals of this unit, for this may • The installation to the vehicle should securely fasten
cause malfunction or damage. the unit to a place in which it will not obstruct
• Do not connect cables and leads to both RCA driving. If the unit comes off due to a shock and hits
cable input jacks and the speaker level input a person or safety part, it may cause injury or an
terminals simultaneously, for this may cause accident.
4Ω 4Ω
malfunction or damage. • After installing the unit, check to make sure that
• Connect the power control lead to a power electrical equipment such as the brake lamps, turn
supply which can be turned ON/OFF by the signal lamps and windshield wipers operate
ignition key switch (ACC line). With this normally.
connection, shock noise may be generated
when the power of the genuine-accessory car
Self-tapping screw
stereo is switched ON/OFF. (ø4 × 16 mm)
■ Power terminal (234)
Connect to their respective terminals the power
supply wire, and ground wire, all of which pass
through the associated terminal cover. Once the
connections are complete, place the cover on
the terminal section.
Installation board, etc.
(thickness : 15 mm or more)
Controls
1 2 3 4 5
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.
1 Fuse (25 A)
2 Battery terminal
3 Ground terminal
4 Power control terminal
5 Amplifier A/B SPEAKER OUTPUT
terminals
• Stereo Connections:
When you wish to use the unit as a stereo
amplifier, stereo connections are used.
• 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 (+)
and the RIGHT channel (–) SPEAKER OUTPUT
terminals.)
6 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.
System examples
■ 4-channel ■ 4-channel
F L
L
A A
CENTER
R
R
UNIT R
L
B L
R
B
R
A.CH OPERATION B.CH OPERATION INPUT SELECTOR
STEREO MONO (Lch) STEREO MONO (Lch) A B A
A.CH FILTER
! #
OFF
HPF LPF
■ 2-channel
External Number of L
CENTER
A
View Items R
UNIT
L
B
1 R ■ 3-channel
INPUT SELECTOR
A.CH OPERATION B.CH OPERATION
L
MONO (Lch) MONO (Lch) A B A
STEREO STEREO
A
4
! # R
L
■ 2ch + woofer B
1 R
L
A.CH FILTER
A
CENTER
R OFF
HPF LPF
UNIT
L
B
R
INPUT SELECTOR
A.CH OPERATION B.CH OPERATION
A B A
STEREO MONO (Lch) STEREO MONO (Lch)
! #
■ 2-channel ■ 2-channel
L
L
A
CENTER A
R R
UNIT
L
L
B
B
R
R
INPUT SELECTOR
A.CH OPERATION B.CH OPERATION
A B A A.CH FILTER
STEREO MONO (Lch) STEREO MONO (Lch)
OFF
! #
HPF LPF
■ Tri-mode
C
L
L L
CENTER A
R R
UNIT
C
C
L
L L
B
R R
C
A.CH FILTER B.CH FILTER INPUT SELECTOR
A.CH OPERATION B.CH OPERATION
OFF OFF
STEREO MONO (Lch) STEREO MONO (Lch) A B A
HPF LPF HPF LPF
! @ #
Principle of Tri-mode
Method of frequency band division using a coil
and capacitor ... in case of 6dB/oct. slope
Coil (L): Passes low frequencies and blocks
high frequencies. (Low pass)
Capacitor (C): Passes high frequencies and
blocks low frequencies. (High pass)
Example:
When it is required to set a crossover
frequency of 120 Hz using speakers with an
impedance of 4 ohms.
fc=Cut of Frequency (Hz)
R=Speaker Impedance (Ω)
6 7 8 9 0
! @ #
@ FILTER switch
NOTE
These switches allow filtering of the speaker
For the pre-output level or the maximum power
output signals.
output, refer to the "Specifications" in the
• HPF (High Pass Filter) position
instruction manual of the center unit.
Only frequencies of 150 Hz or higher are output.
7 RCA cable ground lead terminal
(Frequencies below 150 Hz are cut.)
When using an RCA cable with a ground lead
• LPF (Low Pass Filter) position
attached, connect the ground lead to this terminal.
Only frequencies of 80 Hz or lower are output.
2CAUTION
(Frequencies above 80 Hz are cut.)
The Lch and Rch will be mixed before output
Do not use this terminal for power source
even if the operation switch is set to STEREO.
grounding. This unit will be damaged if the power
• OFF position
source grounding wire is connected to this
The original sound without filtering is output.
terminal.
# INPUT SELECTOR switch
8 Amplifier A/B LINE IN terminals
This switch selects the input method of the signals
9 LINE OUT terminal
to be amplified by amplifiers A and B.
These jacks output respectively the signals input to
• A B position:
amplifiers A and B. They always output the stereo
Amplifies both of the signals input to amplifiers A
signals regardless of the position of the
and B.
OPERATION switch.
• A position:
0 Speaker level input terminals
Amplifies only signal input amplifier A with both
! OPERATION switch
amplifiers A and B.
The amplification methods of the signals input to
amplifiers A and B can be selected independently
according to the setting of this switch.
• STEREO position:
The amplifier can be used as a stereo amplifier.
• MONO (Lch) position:
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.)
Connection
NOTE
For safe installation, read "Installation procedure" before starting work.
■ RCA cable connection
Front left speaker
Front right speaker CENTER UNIT (Cassette receiver,
CD receiver, etc.)
Rear left speaker
Rear right speaker
RCA cable*
B.CH FILTER
OFF
HPF LPF
@
A
7
Left speaker
Right speaker
Subwoofer
Power control wire*
B.CH FILTER
OFF
HPF LPF
@
■ Speaker stereo connection
A L A
Lead terminal*
4
5
T
RI GH
Left speaker
ID GE D
BR
FT
LE
Right speaker
B.CH FILTER
OFF
HPF LPF
@ BRIDGED
A
B
L R
B L
B
Crossover Frequency
0 dB
■ Power wire connection
-3 dB
High pass
L
C
Subwoofer
(L + R)
Frequency
159000 159000
2 3
C= (µF) = = 331.25 µF
fc x R 120Hz x 4Ω
159 x R 159 x 4Ω
L= (mH) = = 5.3 mH
fc 120Hz
2CAUTION
• If you wish to bridge-connect a speaker, the
speaker impedance must be no less than 4
ohms. Connecting a speaker with an
impedance lower than 4 ohms may damage
Battery wire*
the unit.
• Be sure to connect capacitors to speakers to
which high frequencies will be passed.
Failure to do so will result in a drop of the
Protective Fuse*
combined impedance with the subwoofer.
• Ensure that the withstand voltage and
current ratings of the capacitors (C) and coils
(L) are sufficient.
6
40
1
30 Power indicator
0.5
2
20
3 10
0.3
4 (W)
(MIN)5 0.2(MAX)
INPUT SENSITIVITY(V)
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.
■ 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.
■ Speaker level input connection
Genuine-accessory
car stereo (No line
Cable Color of the
output center unit
connector
etc.)
White
L
White/Black
A
Gray
R
Gray/Black
Green
L
L L R
Green/Black
B A
R Purple
L L R
R
Purple/Black
B
R
B
ACC
Battery
Car fuse box
■ Speaker bridge connection
R A
Bridge
Lead terminal*
5 4
T
RI GH
D
ID GE
BR
FT
LE
BRIDGED
A
B
L R
R B Bridge
Description of markings in the figure.
A
A-channel
A L
A.ch Left
A R
A.ch Right
4 B
B-channel
Lead terminal*
L
B B.ch Left
B R B.ch Right
Front
F
Terminal cover
R Rear
Commercially available
*
parts
Power control wire*
Ground wire*
Battery