Kenwood Stereo Amplifier KAC 819 User 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.  
(No sound from one side.)  
• Input (or output) cables are  
disconnected.  
• Connect the input (or output)  
cables.  
• Protection circuit may be  
activated.  
• The connection of the sigma  
servo terminals is wrong.  
• Volume is too high.  
• Check connections by referring  
to "Power indicator".  
• Check the connection referring  
to "Sigma servo feed back".  
• Replace the fuse and use lower  
volume.  
• After check the speaker cord and  
fixing the cause of the short,  
replace the fuse.  
KAC-819  
INSTRUCTION MANUAL  
MONO POWER AMPLIFIER  
(Blown fuse.)  
• The speaker cord is shorted.  
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 wire are  
connected with wrong + / -  
polarity.  
• Connect them properly checking  
the + / - of the terminals and  
wires well.  
• A speaker wire is pinched by a  
screw in the car body.  
• Connect the speaker wire again  
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 (2 ) ................................................................................................450 W × 1  
Max Power Output (4 ) ................................................................................................300 W × 1  
Rated Power Output (4 ) ............................................150 W × 1 (20 Hz ~ 200 Hz, 0.08 % THD)  
Rated Power Output (4 ) ........................................................150 W × 1 (DIN45324, +B=14.4V)  
Rated Power Output (2 ) ............................................................230 W × 1 (100 Hz, 0.8 % THD)  
Frequency Response (+0, –3 dB) ............................................................................5 Hz ~ 200 Hz  
Sensitivity (MAX) ..............................................................................................0.2 V (rated output)  
Sensitivity (MIN) ..............................................................................................5.0 V (rated output)  
Signal to Noise Ratio............................................................................................................100 dB  
Input Impedance....................................................................................................................10 kΩ  
Damping Factor ..............................................................................More than 2000 (at connect)  
Low Pass Filter Frequency (18 dB/oct.)........................................................50 ~ 200 Hz (variable)  
Infrasonic Filter Frequency (18 dB/oct.) ..........................................................................15 / 25 Hz  
Bass Boost Circuit (90 Hz) ................................................................................................6 / 12 dB  
Take the time to read through this instruction manual.  
Familiarity with installation and operation procedures will help  
you obtain the best performance from your new power amplifier.  
For your records  
Record the serial number, found on the back of the unit, in the spaces  
designated on the warranty card, and in the space provided below.  
Refer to the model and serial numbers whenever you call upon your  
KENWOOD dealer for information or service on the product.  
Model KAC-819 Serial number  
General  
Operating Voltage ..............................................................................14.4 V (11 ~ 16 V allowable)  
Current Consumption (100 Hz, 10 % THD)..............................................................................21 A  
Dimensions (W × H × D) ..................................................................................290 × 56 × 200 mm  
..................................................................................................11-7/16 × 2-3/16 × 7-14/16 inch  
Weight......................................................................................................................3.1 kg (6.8 lbs)  
© PRINTED IN USA B64-1964-00 (KM/EM)  
Wiring  
Safety precautions  
Accessories  
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 center unit and this unit according  
to the required application.  
5.Connect the speaker wires and sigma servo  
feed back wires.  
6.Connect the power wire, power control wire  
and grounding wire following this order.  
7.Install the unit in the car.  
8.Connect the negative - terminal of the battery.  
9.Turn power ON and ensure that sound is output  
normally.  
• If a buzzing noise is heard from the speakers  
External  
View  
Number of  
Items  
when the engine is running, connect a line noise  
Part name  
2WARNING  
filter (optional) to each of the battery wire.  
To prevent injury or fire, take the following  
precautions:  
• When extending the ignition, battery, or ground  
wires, make sure to use automotive-grade wires or  
other wires with a 5mm (AWG10) or more to  
prevent wire deterioration and damage to the wire  
coating.  
• To prevent a short circuit, never put or leave any  
metallic objects (such as coins or metal tools) inside  
the unit.  
• If the unit starts to emit smoke or strange smells,  
turn off the power immediately and consult your  
Kenwood dealer.  
• Do not touch the unit during use because the surface  
of the unit becomes hot and may cause burns if  
touched.  
• Do not allow the wire to directly contact the edge  
of the iron plate by using Grommets.  
Terminal cover  
(Power terminal)  
1
4
• 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.  
Self-tapping screws  
2
(ø4 × 16 mm)  
Installation  
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.  
2WARNING  
2CAUTION  
2CAUTION  
To prevent fire caused by a short in the wiring,  
connect a fusible link or breaker nearby the  
battery’s positive terminal.  
• 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.  
To prevent damage to the machine, take the  
following precautions:  
• Be sure the unit is connected to a 12V DC power  
supply with a negative ground connection.  
• Do not open the top or bottom covers of the unit.  
• Do not install the unit in a spot exposed to direct  
sunlight or excessive heat or humidity. Also avoid  
places with too much dust or the possibility of water  
splashing.  
• When replacing a fuse, only use a new one with the  
prescribed rating. Using a fuse with the wrong rating  
may cause your unit to malfunction.  
2CAUTION  
• If sound is not output normally, immediately  
turn power off and check connections. Be sure  
to perform the sigma servo connection  
correctly.  
• Be sure to make correct connections of the  
sigma servo terminals.  
Example: One Power Amplifier Is Used  
Maximum Current Drawn  
Protective Fuse  
Cross-sectional Area of  
Wiring Wire (AWG)  
21 A  
40 A × 1 [20 A × 2]  
2
5 mm (AWG 10) or  
• Be sure to turn the power off before changing  
the setting of any switch.  
greater × 1  
• If the fuse blows, check wires 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 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.  
• To prevent a short circuit when replacing a fuse, first  
disconnect the wiring harness.  
20 A  
20 A  
20 A  
20 A  
NOTE  
• If you experience problems during installation,  
consult your Kenwood dealer.  
• If the unit does not seem to be working right, consult  
your Kenwood dealer.  
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.  
FCC WARNING  
This equipment may generate or use radio frequency  
energy. Changes or modifications to this equipment  
may cause harmful interference unless the  
modifications are expressly approved in the instruction  
manual. The user could lose the authority to operate  
this equipment if an unauthorized change or  
modification is made.  
• After installing the unit, check to make sure that  
electrical equipment such as the brake lamps, turn  
signal lamps and windshield wipers operate  
normally.  
• After installation, check that the brake lamps,  
winkers, and wipers work properly.  
• 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.  
Power terminal (23)  
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.  
Self-tapping screw  
(ø4 × 16 mm)  
Cleaning the unit  
If the front panel gets dirty, turn off the power and  
wipe the panel with a dry silicon cloth or soft cloth.  
4Ω  
Installation board, etc.  
(thickness : 15 mm or  
more)  
4Ω  
4Ω  
4Ω  
2CAUTION  
8  
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.  
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