CLASS D MONO POWER AMPLIFIER
KAC-M615D
INSTRUCTION MANUAL
© B64-4193-00/00 (MV)
Safety precautions
8Ω
2Ω
4Ω
4Ω
4Ω
4Ω
4Ω
4Ω
4Ω4Ω4Ω
WARNING
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 5 mm (AWG 10) 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.
• Mounting and wiring this product requires skills and
experience. For safety’s sake, leave the mounting
and wiring work to professionals.
CAUTION
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 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.
• To prevent a short circuit when replacing a fuse, first
disconnect the wiring harness.
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.
Wiring
• 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.
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• 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
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.
• 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 mm
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.
· terminal.
(AWG 10) or
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.
• Use speakers that have an impedance of 2 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.
Combined impedance
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.
CAUTION
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.
To prevent battery from running out
When the unit is used in the ACC ON position without
turning the engine ON, it depletes the battery. Use it
after starting the engine.
nten
Installation
Ø 4.6
198 mm
131 mm
217 mm
230 mm
Self-tapping screw
(ø4 × 16 mm)
Installation board, etc.
(thickness : 15 mm or more)
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Installation
Accessories
Part name External View
Self-tapping screws
(ø4 × 16 mm)
Terminal cover
(Power terminal)
Speaker level input cable
Number
of Items
4
1
1
Installation procedure
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.
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.
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.
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.
• Do not mount the unit in a place where the 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
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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.
Protection function
The protection function is activated in the following
situations:
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.
• When a speaker wire 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 internal temperature is high and unit
won’t operate.
• When a ground wire 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.
Connection
WARNING
Remove the ignition
key and disconnect the
negative · terminal of
the battery to prevent
short circuits.
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.
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 connections
• The genuine-accessory car stereo shall have a maximum power output of no more than 40 W.
Speaker output terminals
• As this unit accepts speakers with a minimum impedance of 2 ohms, connect speakers with 2-ohms or
higher impedance to these terminals.
Fuse
30 A × 1
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FUSE[30A
]
SPEAKER OUTPUT
P.CON
GND
POWER IN
BATT.
SPEAKER OUTPUTSPEAKER OUTPUT
R
LINE IN
INPUT
SENSITIVITY[V
]
LPF
FREQUENCY[Hz
]
0.2
[
MAX
]
[
MIN
]
5
SPEAKER
LEVEL INPUT
L
ON
BASS EXPANDER
OFF
0.5
150
100
20050
70
0.3
1
4
3
2
R
LINE IN
INPUT
SENSITIVITY[V
]
LPF
FREQUENCY[Hz
]
0.2
[
MAX
]
[
MIN
]
5
SPEAKER
LEVEL INPUT
L
ON
BASS EXPANDER
OFF
0.5
150
100
20050
70
0.3
1
4
3
2
Connection
■ RCA cable or Speaker level input connection
• RCA cable connections
* Commercially available parts
Left input Right input
CENTER UNIT
(CD receiver, etc.)
• Speaker level input connections
Cable Color of the connector
L
R
Left
Right
9
White
·
White/Black
9
Gray
·
Gray/Black
■ Power wire and Speaker wire connection
Terminal cover
Battery wire*
Protective Fuse*
RCA cable*
Power control wire*
Genuine-accessory car
stereo (No line output
center unit etc.)
Power control wire*
(RCA cable connection)
• Dual voice coil subwoofer
Speaker level
input cable
Lead terminal*
Subwoofer (L + R)
(≥2)
When two subwoofers are
connected. (≥4)
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Battery
Ground wire*
(4 + 4)
(2 + 2)
Controls
R
LINE IN
INPUT
SENSITIVITY[V
]
LPF
FREQUENCY[Hz
]
0.2
[
MAX
]
[
MIN
]
5
SPEAKER
LEVEL INPUT
L
ON
BASS EXPANDER
OFF
0.5
150
100
20050
70
0.3
1
4
3
2
40W–15W
0.2
[
MAX
]
[
MIN
]
5
0.5
0.3
1
4
3
2
1 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. Refer to <Protection function> (page 4).
2 LPF(Low-Pass Filter) FREQUENCY control
This control adjusts the frequency band output from this unit.
3 BASS EXPANDER switch
Setting this switch to "ON", when a certain volume is exceeded, a dynamic bass sound is output.
4 INPUT SENSITIVITY control
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.
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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.
No sound. (Blown fuse.)
Input (or output) cables are disconnected.
Connect the input (or output) cables.
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 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 9 / · polarity.
Connect them properly checking the 9 / · 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
Audio Section
Max Power Output 600 W
Rated Power Output (+B = 14.4 V )
(4 ) (20 Hz – 200 Hz, 1.0 % THD) 200 W × 1
(2 ) (100 Hz, 1.0 % THD) 300 W × 1
Frequency Response (+0, –3 dB) 20 Hz – 200 Hz
Sensitivity (rated output) (MAX.)
(MIN.)
Input Impedance 10 k
Signal to Noise Ratio 94 dB
Low Pass Filter Frequency (-12 dB/oct.) 50 – 200 Hz (variable)
0.2 V
5.0 V
General
Operating Voltage 14.4 V (11 – 16 V allowable)
Current Consumption 21 A
Installation Size (W × H × D) 198 × 59 × 230 mm
Weight 1.8 kg
* Specifications subject to change without notice.
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