KAC-746
4-CHANNEL POWER AMPLIFIER
INSTRUCTION MANUAL
© B64-1176-00 (EM)
Installation procedure
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.
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.
2CAUTION
• 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.
• 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.
Installation
Self-tapping screw
(ø4 × 16 mm)
Installation board, etc.
(thickness : 15 mm or more)
• 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.)
Length
0.5m
1m
2m
4m
5m
6m
Type
RCA cable
RCA cable (ø7mm)
RCA cable (ø12mm)
CA-2SL
CA-12SL CA-22SL
CA-52SL
CA-53WL
CA-3WL CA-13WL CA-23WL
CA-5W CA-15W CA-25W
CA-45W
CA-65W
2CAUTION
• 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.
• After installing the unit, check to make sure that electrical equipment such as the brake lamps,
turn signal lamps and windshield wipers operate normally.
• Install the unit securely in a location that does not interfere with driving.
3
Controls
This is a 4 channel am plifier including 2 stereo am plifiers in a body. One am plifier is
referred to as am plifier A and the other is am plifier B. This unit is com patible w ith
a large variety of system s by com bining the sw itches and functions described in
the follow ing.
1
5
SPEAKER LEVEL INPUT
BRIDGED
LEFT
FUSE(30A)
POWER IN
LEFT
RIGHT
SPEAKER OUTPUT
RIGHT
A
B
BRIDGED
A
GND
SPEAKER LEVEL INPUT
BATT
P.CON(REMOTE)
A
A
B
B
B
L
R
L
R
234
6
7
8
9
0
!
@
GND
MONO
A
LINE IN
B
A
+
B
LINE OUT
INPUT
SENSITIVITY(V)
INPUT
SENSITIVITY(V)
L
L
100
150
80
80
150 100
0.5 0.3
0.5 0.3
100
80
100
80
FILTER
OFF
OPERATION
1.0
OPERATION
FILTER
OFF
LPF
1.0
4 CHANNEL
POWER AMPLIFIER
150
150
HPF
LPF
HPF
R
50 LPF 200
50 HPF 200
FREQUENCY(Hz)
MIN
MAX
MIN
MAX
STEREO
50 LPF 200
50 HPF 200
FREQUENCY(Hz)
R
STEREO
L
MONO(Lch)
MONO(Lch)
A
B
A
+
R
L
+
R
CONTROL
A
INPUT SELECTOR
CONTROL
B
# $ % ^
Amplifier A
Amplifier B
1 Fu s e (3 0 A)
2 Ba t t e ry t e rm in a l
3 Gro u n d t e rm in a l
4 P o w e r c o n t ro l (REMOTE) t e rm in a l
5 Am p lifie r A s p e a k e r o u t p u t t e rm in a ls
6 Am p lifie r B s p e a k e r o u t p u t t e rm in a ls
7 S p e a k e r le ve l in p u t t e rm in a ls
8 FREQUENCY c o n t ro l
When the FILTER switch is set to the HPF (High-Pass Filter) or LPF (Low-Pass Filter) position,
the threshold frequency can be adjusted with this control.
9 FILTER s w it c h
High-pass or low-pass filtering can be applied to the speaker output according to the setting
of this switch.
0 OP ERATION s w it c h
The amplification methods of the signals input to amplifiers A and B can be selected
independently according to the setting of this switch.
4
• STEREO position:
The amplifier can be used as a stereo amplifier.
• L+R position:
The input left and right signals are combined before being amplified. Use this position when the
unit is used for subwoofer speakers or the L+R (monaural) sound is required.
• 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.)
! INP UT S ENS ITIVITY c o n t ro l
Set this control according to the pre-output level of the center unit
10
connected with this unit, or to the maximum power output of the genuine-
accessory car stereo.
0.5 0.3
15
Use the diagram on the right as a guide.
1.0
MIN
NOTE
MAX
25
For the pre-output level or the maximum power output, refer to the
“Specifications” in the instruction manual of the center unit.
(W)
@ RCA c a b le g ro u n d le a d t e rm in a l
# INP UT S ELECTOR s w it c h
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.
• A position:
Amplifies only signal input amplifier A with both amplifiers A and B.
$ Am p lifie r A LINE IN t e rm in a l
% Am p lifie r B LINE IN t e rm in a l
^ LINE OUT t e rm in a l
These jacks output respectively the signals input to amplifiers A and B. They always output
the stereo signals regardless of the position of the OPERATION switch.
Protection function
This unit is equipped w ith a protection function for protecting this unit and your
speakers from various accidents or problem s that can occur.
When the protection function is triggered, the Pow er indicator goes off and the
am plifier stops operating.
■ P o w e r in d ic a t o r:
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.
■ Th e p ro t e c t io n fu n c t io n a c t iva t e s in t h e fo llo w in g
s it u a t io n s :
• When a speaker output contacts ground.
• When the unit malfunctions and a DC signal is sent to the speaker output.
• When the temperature of internal parts exceeds 120°C (248°F).
• When a ground cable 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.
5
Connection
■RCA c a b le c o n n e c t io n
BLINE IN (Rear)
2CAUTION
CENTER UNIT
(Cassette receiver,
CD receiver, etc.)
Do not connect cables and
leads to both RCA cable input
jacks and the speaker input
terminals simultaneously, for
this may cause malfunction
or damage.
Power control cable
ALINE IN (Front)
POWER IN
RCA cable (Commercially
available part)
GND
BATT
P.CON(REMOTE)
B Left input (White)
A Left input (White)
GND
MONO
LINE IN
B
A
{
B
LINE OUT
INPUT
SENSITIVITY(V)
INPUT
SENSITIVITY(V)
L
L
100
80
80
0.5 0.3
0.5 0.3
150
150 100
100
80
100
80
FILTER
OFF
OPERATION
OPERATION
FILTER
OFF
LPF
1.0
MIN
1.0
4 CHANNEL
POWER AMPLIFIER
150
150
HPF
LPF
HPF
R
50 LPF 200
50 HPF 200
FREQUENCY(Hz)
MAX
MIN
MAX
STEREO
50 LPF 200
50 HPF 200
FREQUENCY(Hz)
R
STEREO
L
MONO(Lch)
{R
MONO(Lch)
{R
A
B
A
L
CONTROL
A
INPUT SELECTOR
CONTROL
B
A Right input (Red) B Right input (Red)
RCA cable ground term inal
2CAUTION
When using an RCA cable with
a ground lead attached, connect
the ground lead to this terminal.
Do not use this terminal for power source
grounding. This unit will be damaged if the
power source grounding wire is connected
to this terminal.
■S p e a k e r le ve l in p u t c o n n e c t io n
Connect the unit by inserting it in the connection between the genuine-accessory car stereo and
speakers.
Power control
(REMOTE) lead
terminal
Front
ACC
A Left input
(Front left)
A Right input
(Front right)
+
-
Battey
SPAKELEVEL INPUT
LEFT RIGHT
BRIDGED
LEFT
FUSE(30A)
POWER IN
SPEAKER OUTPUT
RIGHT
A
BRIDGED
A
Genuine-accessory
car stereo
GND
SPEAKER LEVEL INPUT
BATT
P.CEMOTE)
A
A
B
B
B
B
L
R
L
R
B Left input
(Rear left)
B Right input
(Rear right)
2CAUTION
• The genuine-accessory car stereo shall have a
maximum power output of no more than 25 W.
• Do not connect the speaker output leads from a
Rear
power amplifier (Optional) to the speaker input terminals of this unit, for this may cause
malfunction or damage.
• Do not connect cables and leads to both RCA cable input jacks and the speaker input terminals
simultaneously, for this may cause malfunction or damage.
• Connect the power control lead to a power supply which can be turned ON/OFF by the ignition
key switch (ACC line).
With this connection, shock noise may be generated when the power of the genuine-accessory
car stereo is switched ON/OFF.
6
■P o w e r a n d S p e a k e rs c a b le c o n n e c t io n
• If a buzzing noise is heard from the
Front left
speaker
Power control
(REMOTE) lead
terminal
speakers when the engine is
running, connect a line noise filter
(optional) to each of the battery
cable.
Front right
speaker
A Left output
(Front left)
• Do not allow the cord to directly
contact the edge of the iron plate
by using Grommets.
A Right output
(Front right)
SPEAKER LEVEL INPUT
BRIDED
LEFT
FUSE(30A)
POWER IN
LEFT
RIGHT
SPEAKER OUTPUT
RIGHT
A
B
BRIDGED
A
GND
SPEAKER LEVEL INPUT
BATT
P.CON(REMOTE)
A
B
A
B
B
L
R
L
R
B Right output
(Rear right)
Terminal cover
Battery cable (Yellow)
Rear right
speaker
Rear left
speaker
Fire wall
Round terminal
(Large)
B Left output
(Rear left)
Grommets
Power control cable
Ground cable
(Black)
+
-
Battery
2WARNING
Pow er term inal
Pass battery and ground cables through supplied
terminal cover and connect to respective
terminals. After completing connections, fasten
terminal cover over terminal bracket.
To prevent fire caused by a short in the
wiring, connect a fusible link or breaker
nearby the battery’s positive terminal.
NOTE
Round terminal (Medium)
Round terminal (Small)
Connect the ground cable 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 cable is not connected.
(Brid g e d )
A Bridged
2CAUTION
If you wish to bridge-connect a
speaker, the speaker impedance must
SPEAKER LEVEL INPUT
be no less than 4 ohms.
BRIDGED
LEFT
POWER IN
LEFT
RIGHT
SPEAKER OUTPUT
RIGHT
A
B
BRIDGED
A
GND
P.CON(REMOTE)
SPEAKER LEVEL INPUT
Connecting a speaker with an
impedance lower than 4 ohms may
damage the unit.
BATT
A
A
B
B
B
L
R
L
R
exam ples:
L
L
B Bridged
R
R
≥4Ω
≥8Ω ≥8Ω
7
System exam ples
■ Fu ll-ra n g e 4 -c h a n n e l + S u b w o o fe r s ys t e m
Sw itch setting
100
80
150
100
80
L
L
FILTER
OPERATION
150
HPF
OFF
A
B
LPF
R
R
50 LPF 200
50 HPF 200
CENTER UNIT
FREQUENCY(Hz)
STEREO MONO(Lch)
L+R
L
R
L
L
CONTROL
A
80
150 100
R
100
80
A
B
A
OPERATION
FILTER
OFF
INPUT SELECTOR
150
HPF
LPF
A+B
LINE OUT
50 LPF 200
50 HPF 200
STEREO MONO(Lch)
L+R
FREQUENCY(Hz)
R
CONTROL
B
Amplifier
■ Hig h -p o w e r 2 -c h a n n e l s ys t e m
Sw itch setting
100
80
150
100
80
L
L
FILTER
OPERATION
(Bridged)
(Bridged)
150
HPF
A
B
OFF
LPF
R
R
CENTER UNIT
50 LPF 200
50 HPF 200
FREQUENCY(Hz)
STEREO MONO(Lch)
L+R
L
R
L
L
CONTROL
A
80
R
150 100
100
80
A
B
A
OPERATION
FILTER
OFF
INPUT SELECTOR
150
HPF
LPF
A+B
LINE OUT
50 LPF 200
50 HPF 200
FREQUENCY(Hz)
R
STEREO MONO(Lch)
L+R
CONTROL
B
■ Hig h -p a s s (8 0 Hz) + S u b w o o fe r(8 0 Hz) s ys t e m
Sw itch setting
100
80
150
100
80
L
L
FILTER
OPERATION
(High pass)
150
HPF
A
B
OFF
CENTER UNIT
LPF
R
R
50 LPF 200
50 HPF 200
FREQUENCY(Hz)
STEREO MONO(Lch)
L+R
L
R
L
L
CONTROL
A
Subwoofer
(L + R)
(Bridged)
80
R
150 100
100
80
A
B
A
OPERATION
FILTER
OFF
INPUT SELECTOR
150
HPF
LPF
A+B
LINE OUT
50 LPF 200
50 HPF 200
FREQUENCY(Hz)
R
STEREO MONO(Lch)
L+R
CONTROL
B
■ Tri-m o d e
Sw itch setting
100
80
C
L
150
100
80
FILTER
OPERATION
L
L
150
HPF
OFF
A
B
LPF
50 LPF 200
50 HPF 200
R
R
C
FREQUENCY(Hz)
STEREO MONO(Lch)
L+R
CENTER UNIT
L
R
L
L
CONTROL
A
C
L
80
150 100
100
80
A
B
A
R
OPERATION
FILTER
OFF
INPUT SELECTOR
150
HPF
LPF
50 LPF 200
50 HPF 200
FREQUENCY(Hz)
A+B
LINE OUT
C
STEREO MONO(Lch)
L+R
R
CONTROL
B
●P rin c ip le o f Tri-m o d e
Method of frequency band division using a coil and capacitor•••in case of 6dB/ oct. slope
Coil (L): Passes low frequencies and blocks high
Crossover Frequency
frequencies. (Low pass)
0 dB
-3 dB
Capacitor (C): Passes high frequencies and blocks low
frequencies. (High pass)
159000
L
C
C=
L=
(µF)
fc=Cut of Frequency (Hz)
fc x R
159 x R
fc
R=Speaker Impedance (Ω)
Frequency
(mH)
●Exa m p le :
When it is required to set a crossover frequency of 120 Hz using speakers w ith an
im pedance of 4 ohm s.
Prepare commercially-available coil and capacitor with the closest ratings to the results
calculated from the formula above. The capacitor rating should be as close as possible to
331.25 (µF) and the coil rating should be as close as possible to 5.3 (mH).
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 the unit.
8
Troubleshooting guide
Oft e n , w h a t a p p e a rs t o b e a m a lfu n c t io n is d u e t o u s e r e rro r. Be fo re
c a llin g fo r s e rvic e , p le a s e c o n s u lt t h e fo llo w in g t a b le .
S ym p t o m
Ca u s e
Re m e d y
No sound.
(No sound from one side.)
• Input (or output) cables are
disconnected.
• Connect the input (or output)
cables.
• Protection circuit may be
activated.
• The fuse may be blown
because the volume was too
high.
• Check connections by referring
to "Protection function".
• Replace the fuse with a new
fuse and use a lower volume.
The output level is too
sm all (or too large).
The input sensitivity adjusting
control is not set to the correct
position.
Adjust the control correctly
referring to “Controls”.
The sound quality is bad.
(The sound is distorted.)
• The speakers cable are
connected with wrong + / -
polarity.
• Connect them properly checking
the + / - of the terminals and
cables well.
• A speaker cable is pinched by a • Connect the speaker cable again
screw in the car body.
so that it is not pinched by
anything.
• The switches may be set
improperly.
• Set switches properly by
referring to "Controls" and
"System examples".
Specifications
S p e c ific a t io n s s u b je c t t o c h a n g e w it h o u t n o t ic e .
Audio Section
Max Power Output (4 Ω)
4 Channel Mode..........................................................................................................70 W × 4
3 Channel Mode ....................................................................................70 W × 2 + 200 W × 1
2 Channel Mode........................................................................................................200 W × 2
Rated Power Output (4 Ω)
4 Channel Mode ..................................................................35 W × 4 (DIN45324, +B=14.4 V)
3 Channel Mode)..................35 W × 2 (1 kHz, 0.08 % THD) + 100 W × 1 (1 kHz, 0.8 % THD
2 Channel Mode........................................................................100 W × 2 (1 kHz, 0.8 % THD)
Rated Power Output (2 Ω)
4 Channel Mode..........................................................................50 W × 4 (1 kHz, 0.8 % THD)
Frequency Response (+0, –1 dB) ............................................................................5 Hz ~ 50 kHz
Signal to Noise Ratio............................................................................................................100 dB
Sensitivity (MAX) (rated output)............................................................................................0.15 V
Sensitivity (MIN) (rated output) ..............................................................................................4.0 V
Input Impedance....................................................................................................................10 kΩ
Low Pass Filter (12 dB/oct.) (Variable) ........................................................................50 ~ 200 Hz
High Pass Filter (12 dB/oct.) (Variable) ........................................................................50 ~ 200 Hz
General
Operating Voltage ..............................................................................14.4 V (11 ~ 16 V allowable)
Current Consumption (1 kHz, 10% THD) ................................................................................28 A
Dimensions (W × H × D) ................................................................................290 × 52 × 230 mm
Weight ..................................................................................................................................3.1 kg
9
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