Kenwood Stereo Amplifier KAC 718 User Manual

KAC-718  
MONO POWER AMPLIFIER  
INSTRUCTION MANUAL  
© B64-1357-00 (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 drivers 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  
 
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  
 
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 2or 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  
(4)  
240W  
(4)  
240W  
(4)  
240W  
240W  
240W  
240W  
(4)  
(4)  
(4)  
(4)  
120W  
(4)  
4  
(120W/8)  
(420W/2)  
2 Ω  
8 Ω  
Maximum output of  
the amplifier  
Combined  
impedance  
Rated input power and  
impedance of the speakers  
English 5  
 
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  
 
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 batterys  
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  
 
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 ) ..............................................................................240 W × 1 (at 100 Hz)  
Rated Power Output (4 )........................................120 W × 1 (DIN45324, +B=14.4V, at 100 Hz)  
Rated Power Output (2 ) ........................................................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 ) ........................................................................15 A  
Dimensions (W × H × D)..................................................................................290 × 56 × 170 mm  
Weight ..................................................................................................................................3.0 kg  
8 English  
 

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