KAC-718
MONO POWER AMPLIFIER
INSTRUCTION MANUAL
© B64-1357-00 (EM)
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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.
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.
• 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.
• 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.
English 3
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Controls
Operations of the following control and switches are required in accordance with the center
unit and speakers connected with this unit.
LINE IN INPUT SENSITIVITY(V)
BASS
SPEAKER LEVEL INPUT
LEFT RIGHT
POWER IN
FUSE(25A)
ENPHASIS
1.0
90
120
GND
BATT
P.CON(REMOTE)
OFF
170
ON
L
0.5 50
0.3
MIN
MAX
30
200
R
LOWPASS FILTER
FREQUENCY(Hz)
GND
1
2 3 4 5
6
7 8 9
0
SPEAKER OUTPUT
MONO
MONO POWER AMPLIFIER
!
1 RCA cable ground lead terminal
2 LINE IN terminal
3 INPUT SENSITIVITY control
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
15
0.3
1
Use the diagram on the right as a guide.
2
3
NOTE
4
0.2
25
5
(V)
(W)
For the pre-output level or the maximum power output, refer to the
“Specifications” in the instruction manual of the center unit.
4 LOW PASS FILTER FREQUENCY control
This control adiusts the frequency band output from this unit.
5 BASS EMPHASIS switch
This switch allows to emphasize the output from this unit.
6 Speaker level input terminals
7 Battery terminal
8 Ground terminal
9 Power control (REMOTE) terminal
0 FUSE (25 A × 1)
! Speaker output terminals
4 English
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Protection function
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.
■ 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 activates in the following situations:
• When a speaker cable 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 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.
Power indicator
SPEAKER OUTPUT
MONO
MONO POWER AMPLIFIER
Connection
■ Speakers cable connection
SPEAKER OUTPUT
MONO
MONO POWER AMPLIFIER
T
TPU
U
MONO
SPEAKER
O
Subwoofer
Lead terminal
(Commercially available parts)
■ 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 2Ω 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.
120W
(4Ω)
240W
(4Ω)
240W
(4Ω)
240W
240W
240W
240W
(4Ω)
(4Ω)
(4Ω)
(4Ω)
120W
(4Ω)
4 Ω
(120W/8Ω)
(420W/2Ω)
2 Ω
8 Ω
Maximum output of
the amplifier
Combined
impedance
Rated input power and
impedance of the speakers
English 5
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Connection
■ RCA cable connection
2CAUTION
Left output (White)
Right output (Red)
RCA cable
(Commercially
available part)
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
(Commercially
available part)
Left input
Right input
LININ INPUT SENSITIVITY(V)
BASS
SPEAKER LEVEL INPUT
LEFT RIGHT
POWER IN
FUSE(25A)
ENPHASIS
1.0
90
120
GND
BATT
P.CON(REMOTE)
OFF
170
ON
L
0.5 50
0.3
MAX
MIN
30
200
R
LOWPASS FILTER
FREQUENCY(Hz)
GND
RCA cable ground terminal
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.
D
N
G
■ Speaker level input connection
Left output
Genuine-accessory
car stereo
ACC
Right output
Car fuse
box
Speaker level input terminals
Lead terminal
(Commercially
available parts)
+
- Battey
Left input
Right input
LINE IN INPUT SENSITIVITY(V)
BASS
PEAKER LEVEL INPU
LEFT RIGHT
POWER IN
FUSE(25A)
ENPHASIS
1.0
90
120
GND
BATT
P.CON(REMOTE)
OFF
170
ON
L
0.5 50
0.3
MAX
MIN
30
200
R
LOWPASS FILTER
FREQUENCY(Hz)
GND
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 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 English
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■ Power wire connection
LINE IN INPUT SENSITIVITY(V)
BASS
SPEAKER LEVEL INPUT
LEFT RIGHT
POWER IN
FUSE(25A)
ENPHASIS
1.0
90
120
GND
BATT
P.CON(REMOTE)
OFF
170
ON
L
0.5 50
0.3
MAX
MIN
30
200
R
LOWPASS FILTER
FREQUENCY(Hz)
GND
Power terminal
Round terminal (Medium)
Round terminal (Small)
Terminal cover
Power control cable
(Commercially available part)
Battery cable
(Commercially available part)
Ground cable
(Commercially available part)
Round terminal (Large)
Protective
Fuse
Battery
2WARNING
To prevent fire caused by a short in the wiring, connect a fusible link or breaker nearby the battery’s
positive terminal.
Wiring
• 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 cord 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 attach a protective fuse into the battery wire close to the battery. Use a protective fuse
having a capacity that is about 10 A higher than the maximum current drawn by the amplifier.
• Use vehicle-type (fire-resistant) power supply wiring wire for the battery wire and the ground wire.
The current capacity of the power supply wiring wire should be about 10 A higher than that of the
protective fuse capacity (which means about 20 A higher than the maximum current drawn by the
amplifier).
• 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.
Power terminal
Connect to their respective terminals the power control wire, 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.
Example: One Power Amplifier Is Used
Maximum Current Drawn
Protective Fuse
15 A
30 A × 1 [15 A × 2]
15 A
15 A
2
Cross-sectional Area of Wiring
3 mm (AWG 12) or
30 A
15 A
15 A
Wire (AWG)
greater × 1
English 7
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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.
(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
small (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".
Specifications
Specifications subject to change without notice.
Audio Section
Max Power Output (4 Ω) ..............................................................................240 W × 1 (at 100 Hz)
Rated Power Output (4 Ω)........................................120 W × 1 (DIN45324, +B=14.4V, at 100 Hz)
Rated Power Output (2 Ω) ........................................................160 W × 1 (0.8 % THD at 100 Hz)
Signal to Noise Ratio............................................................................................................100 dB
Sensitivity (MAX) ..........................................................................................0.15 V (rated output)
Sensitivity (MIN) ..............................................................................................4.0 V (rated output)
Input Impedance....................................................................................................................10 kΩ
Damping Factor........................................................................................................More than 100
Low Pass Filter Frequency (12 dB / oct.) ....................................................30 ~ 200 Hz (Variable)
General
Operating Voltage ................................................................................14.4 V (11 ~ 16 V allowable)
Current Consumption (1 kHz, 10% THD, 4 Ω) ........................................................................15 A
Dimensions (W × H × D)..................................................................................290 × 56 × 170 mm
Weight ..................................................................................................................................3.0 kg
8 English
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