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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.
• 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
connected with wrong + / -
the + / - of the terminals and
(The sound is distorted.)
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
KAC-849
KAC-749S
.....................................................................
Max Power Output (4 Ω)
4 Channel Mode ...................................................................100 W × 4
80 W × 4
3 Channel Mode...............................................100 W × 2 + 300 W × 1
80 W × 2 + 250 W × 1
2 Channel Mode ...................................................................300 W × 2
250 W × 2
Rated Power Output (4 Ω)
4 Channel Mode (20 Hz ~ 20 kHz, less than 0.08 % THD).....50 W × 4
40 W × 4
(DIN45324, +B=14.4V) ................................50 W × 4
40 W × 4
4 Channel Mode
3 Channel Mode (20 Hz ~ 20 kHz, 0.08 % THD) + (1 kHz, 0.8 % THD)
...........................................................................50 W × 2 + 150 W × 1
40 W × 2 + 120 W × 1
2 Channel Mode (1 kHz, 0.8 % THD)....................................150 W × 2
120 W × 2
Rated Power Output (2 Ω)
4 Channel Mode (1 kHz, 0.8 % THD)......................................75 W × 4
60 W × 4
Frequency Response (+0, –3 dB) ......................................5 Hz ~ 50 kHz
5 Hz ~ 50 kHz
Signal to Noise Ratio ....................................................................100 dB
100 dB
Sensitivity (MAX) (rated output).......................................................0.2 V
0.2 V
Sensitivity
(MIN) (rated output)........................................................5.0 V
5.0 V
Input Impedance ............................................................................10 kΩ
10 kΩ
Low Pass Filter Frequency (12 dB/oct.) (Variable) ................50 ~ 200 Hz
50 ~ 200 Hz
High Pass Filter Frequency (12 dB/oct.) (Variable)................50 ~ 200 Hz
50 ~ 200 Hz
Bass Boost Circuit (90 Hz) ................................................................6 dB
6 dB
General
KAC-849
KAC-749S
..................................................................................
Operating Voltage (11 ~ 16 V allowable) .......................................14.4 V
14.4 V
Current Consumption (1 kHz, 10 % THD) ........................................31 A
26 A
Dimensions (W × H × D) ...........................................261 × 57 × 256 mm
261 × 57 × 256 mm
......................................................................(10-1/4×2-1/4×10-1/16 in.)
(10-1/4×2-1/4×10-1/16 in.)
Weight................................................................................3.5 kg (7.7 lb)
3.5 kg (7.7 lb)
■ 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
passing electricity to the battery‘s negative -
other wires with a 5mm
2
(AWG10) or more to
terminal. Do not turn the power on if the ground
prevent wire deterioration and damage to the wire
wire is not connected.
coating.
• Be sure to attach a protective fuse into the
• To prevent a short circuit, never put or leave any
battery wire close to the battery. Use a
metallic objects (such as coins or metal tools) inside
protective fuse having a capacity that is about 10
the unit.
A higher than the maximum current drawn by the
• If the unit starts to emit smoke or strange smells,
amplifier.
turn off the power immediately and consult your
• Use vehicle-type (fire-resistant) power supply
Kenwood dealer.
wiring wire for the battery wire and the ground
• Do not touch the unit during use because the surface
wire. The current capacity of the power supply
of the unit becomes hot and may cause burns if
wiring wire should be about 10 A higher than that
touched.
of the protective fuse capacity (which means
about 20 A higher than the maximum current
2CAUTION
drawn by the amplifier).
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
Example: One Power Amplifier Is Used
sunlight or excessive heat or humidity. Also avoid
Maximum Current Drawn
31 A / 26 A
places with too much dust or the possibility of water
50 A × 1 [25 A × 2]
Protective Fuse
splashing.
• When replacing a fuse, only use a new one with the
Cross-sectional Area of
5 mm
2
(AWG 10) or
greater × 1
Wiring Wire (AWG)
prescribed rating. Using a fuse with the wrong rating
may cause your unit to malfunction.
• To prevent a short circuit when replacing a fuse, first
25 A
disconnect the wiring harness.
25 A
25 A
25 A
NOTE
■ Speaker Selection
• If you experience problems during installation,
consult your Kenwood dealer.
• The rated input power of the speakers that are
• If the unit does not seem to be working right, consult
going to be connected should be greater than
your Kenwood dealer.
the maximum output power (in Watts) of the
amplifier. Use of speakers having input power
FCC WARNING
ratings that are less than the output power of
This equipment may generate or use radio frequency
the amplifier will cause smoke to be emitted as
energy. Changes or modifications to this equipment
well as damage.
may cause harmful interference unless the
• The impedance of the speakers that are going to
modifications are expressly approved in the instruction
be connected should be 2Ω or greater (for
manual. The user could lose the authority to operate
stereo connections), or 4Ω or greater (for
this equipment if an unauthorized change or
bridged connections). When more than one set
modification is made.
of speakers are going to be used, calculate the
■ Cleaning the unit
combined impedance of the speakers and then
If the front panel gets dirty, turn off the power and
connect suitable speakers to the amplifier.
wipe the panel with a dry silicon cloth or soft cloth.
4Ω
2CAUTION
4Ω
4Ω
Do not wipe the panel with a hard cloth or a cloth
4Ω
dampened by volatile solvents such as paint thinner
8 Ω
2 Ω
and alcohol. They can scratch the surface of the panel
and/or cause the indicator letters to peel off.
KAC-849
KAC-749S
4-CHANNEL POWER AMPLIFIER
INSTRUCTION MANUAL
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-849/749S Serial number
© PRINTED IN USA B64-1969-00 (KM/EM)
■ Accessories
Installation procedure
External
Number of
Part name
1. Remove the ignition key and disconnect the
View
Items
negative - terminal of the battery to prevent
Terminal cover
short circuits.
1
(Power terminal)
2. Set the unit according to the intended usage.
3. Connect the input and output cables of the
Self-tapping screws
4
(ø4 × 16 mm)
units.
4. Connect the speaker wires.
Speaker level input
5. Connect the power wire, power control wire
1
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 (!)
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 connect the speaker output leads from
• Do not install near the dashboard, rear tray, or air
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.
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)
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Summary of Contents for Kenwood KAC-749S
-
Page 1: Troubleshooting Guide
Refer to the model and serial numbers whenever you call upon your KENWOOD dealer for information or service on the product. Model KAC-849/749S Serial number © PRINTED IN USA B64-1969-00 (KM/EM) ■... -
Page 2: Power Indicator
1 Fuse 40 A × 1 : KAC-849 7 FILTER FREQUENCY control 30 A × 1 : KAC-749S NOTE If you can’t find the specified capacity fuse at your store etc., consult your Kenwood dealer. 2 Battery terminal...