4/3/2 CHANNEL POWER AMPLIFIER
KAC-M845
KAC-M645
INSTRUCTION MANUAL
© B64-3924-00/00 (MV)
Installation
■ Accessories
External
View
Number of
Items
Part name
330 mm
236 mm
Self-tapping screws
(ø4 × 16 mm)
4
1
1
Ø4.6
Terminal cover
(Power terminal)
Speaker level input
cable
2 CAUTION
• Do not install in the below locations;
(Unstable location, In a location that interferes
with driving, In a location that gets wet, In a dusty
location, In a place that gets hot, In a place that gets
direct sunlight, In a location that gets hit by hot air)
• 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.
Self-tapping screw
(ø4 × 16 mm)
Cooling fan
(KAC-M845)
Cooling fan
(KAC-M845)
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.
• This unit has cooling fan to decrease the internal
temperature. Do not mount the unit in a place where
the cooling fan and ducts of the unit are blocked.
Blocking these openings will inhibit the cooling of
the internal temperature and result in malfunction.
• 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.
Installation board, etc.
(thickness : 15 mm or more)
• 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
p
q
t
r
s
r
40W
15W
1 A ch FILTER switch
4 B ch LPF FREQUENCY control
Sets the cutoff frequency when the "B ch FILTER"
switch is set to "LPF".
This switch allow filtering of the speaker output
signals.
• OFF position:
5 Power indicator
The original sound without filtering is output.
• HPF (High Pass Filter) position:
Only frequencies of 80 Hz or higher are output.
(Frequencies below 80 Hz are cut.)
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. Refer to <Protection function> (page 2).
2 B ch FILTER switch
This switch allow filtering of the speaker output
signals.
• OFF position:
The original sound without filtering is output.
• LPF (Low-Pass Filter) position:
The filter outputs the band of lower frequencies
than the frequency set with the "LPF
FREQUENCY" control.
The speaker output is automatically turned
monaural (L+R) and the gain is enhanced.
3 INPUT SENSITIVITY control (A.ch/ B.ch)
Set this control according to the pre-output level of
the center unit connected with this unit, or to the
maximum power output of the genuine-accessory
car stereo.
Use the diagram on the right as a guide.
The sensitivities of amplifiers A and B can be
adjusted independently.
4 English
Connection
■ Installation procedure
■ Wiring
Since there are large variety of settings and
connections possible according to applications, read
the instruction manual well to select the proper
setting and connection.
• Take the battery wire for this unit directly from the
battery. If it's connected to the vehicle’s wiring
harness, it can cause blown fuses etc.
• 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 wire 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 install a protective fuse in the power
cord near the battery. The protective fuse should
be the same capacity as the unit’s fuse capacity or
somewhat larger.
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 wires of the units.
4. Connect the speaker wires.
5. Connect the power wire, power control wire and
grounding wire following this order.
6. Install the installation fittings in the unit.
7. Attach the unit.
8. Connect the negative - terminal of the battery.
2 WARNING
To prevent fire caused by a short in the wiring,
connect a fusible link or breaker nearby the battery’s
positive terminal.
• For the power cord and ground, use a vehicle type
(fireproof) power wring cord with a current capacity
greater than the unit’s fuse capacity. (Use a power
wiring cord with a diameter of 5 mm² (AWG 10) or
greater.)
• 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.
2 CAUTION
• If sound is not output normally, immediately turn
power off and check connections.
• Be sure to turn the power off before changing the
setting of any switch.
• If the fuse blows, check wires for shorts, then replace
the fuse with one of the same rating.
• Check that no unconnected wires or connectors are
touching the car body. Do not remove caps from
unconnected wires 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.
• After installation, check that the brake lamps,
winkers, and wipers work properly.
■ Speaker selection
• The input power of the speakers that are going to
be connected should be greater than the 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.
• The impedance of the speakers that are going
to be connected should be 2Ω or greater (for
stereo connections), or 4Ω or greater (for bridged
connections). 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.
4Ω
4Ω
4Ω
4Ω
2Ω
8Ω
Combined impedance
English 5
Connection
■ RCA cable or Speaker level input connection
• RCA cable connections
RCA cable*
CENTER UNIT
(CD receiver, etc.)
Power control wire
(Blue/ White)
A channel input
B channel input
• Speaker level input connections
Cable Color of the connector
9
·
9
·
9
·
9
·
White
White/Black
Gray
Gray/Black
Green
Green/Black
Purple
A channel
Left
Genuine-accessory car
A channel
Right
stereo
(No line output center unit
etc.)
B channel
Left
Speaker level input cable
Car fuse box
B channel
Right
Purple/Black
Battery
ACC
combined impedance is 2Ω or greater for each
channel.
• Bridged Connections:
Make connections to the LEFT channel 9 and the
RIGHT channel · SPEAKER OUTPUT terminals.
The speakers to be connected should have an
impedance of 4Ω or greater. When multiple
speakers are to be connected, ensure that the
combined impedance is 4Ω or greater.
NOTE
• Do not connect cables and leads to both RCA
cable input jacks and the speaker level input
terminals simultaneously, for this may cause
malfunction or damage.
Speaker level input terminals
• The genuine-accessory car stereo shall have a
maximum power output of no more than 40 W.
• 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, pop noise may be generated when
the power of the genuine-accessory car stereo is
switched ON/OFF.
Power control terminal
Controls the unit ON/OFF.
NOTE
Controls the unit power. Be sure to connect it with
all the systems.
Speaker output terminals (A.ch/ B.ch)
• Stereo Connections:
The speakers to be connected should have an
impedance of 2Ω or greater. When multiple
speakers are to be connected, ensure that the
Fuse
KAC-M845: 40 A × 1
KAC-M645: 25 A × 1
6 English
* Commercially available parts
■ Speaker wire connection
• Stereo Connections
A channel
Left speaker
š
A channel
Right speaker
Lead terminal*
B channel
Right speaker
B channel
Left speaker
• Bridged Connections
A channel
Speaker (Bridged)
B channel
Speaker (Bridged)
■ Power wire connection
KAC-M645
KAC-M845
Lead terminal*
Terminal cover
Power control wire*
Battery wire*
Ground wire*
Battery
Protective Fuse*
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
• Input (or output) cables are
disconnected.
SOLUTION
No sound.
• Connect the input (or output) cables.
(No sound from one side.)
(Blown fuse.)
• Protection circuit may be activated.
• Check connections by referring to
<Protection function>.
• 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
small (or too large).
• The input sensitivity adjusting control • Adjust the control correctly referring to
is not set to the correct position. <Controls>.
The sound quality is bad. • The speakers wire are connected with • Connect them properly checking the
(The sound is distorted.)
wrong 9 / · polarity. 9 / · of the terminals and wires well.
• A speaker wire is pinched by a screw • Connect the speaker wire again so that
in the car body. it is not pinched by anything.
• The switches may be set improperly. • Set switches properly by referring to
<Controls>.
Specifications
Audio Section...................................................................... KAC-M845 KAC-M645
Max Power Output .....................................................................................720 W (180 W × 4) 500 W (125 W × 4)
Rated Power Output
Normal (4 Ω) (20 Hz – 20 kHz, 1 % THD)............................................... 60 W × 4 40 W × 4
Normal (2 Ω) (1 kHz, 1 % THD).................................................................... 90 W × 4 60 W × 4
Bridged (4 Ω) (1 kHz, 1 % THD).................................................................180 W × 2 130 W × 2
Frequency Response (+0, –3 dB)....................................................................5 Hz – 50 kHz 5 Hz – 50 kHz
Sensitivity (rated output)........................................................................................0.2 V – 5.0 V 0.2 V – 5.0 V
Signal to Noise Ratio...............................................................................................................94 dB 94 dB
Input Impedance..................................................................................................................... 10 kΩ 10 kΩ
Low Pass Filter Frequency (-12 dB/oct.).....................................50 – 200 Hz (variable) 50 – 200 Hz (variable)
High Pass Filter Frequency (-12 dB/oct.)......................................................................80 Hz 80 Hz
General ................................................................................ KAC-M845 KAC-M645
Operating Voltage.................................................................... 14.4 V (11 – 16 V allowable) 14.4 V (11 – 16 V allowable)
Current Consumption..............................................................................................................36 A 19 A
Dimensions (W × H × D) .......................................................................330 × 59 × 230 mm 330 × 59 × 230 mm
Weight ...........................................................................................................................................2.9 kg 2.7 kg
• Specifications subject to change without notice.
8 English
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