KAC-7251
KAC-7201
PINOWSERTAMRPLUIFIECR T7 pIaOgeN2-13MANUAL
AMPLIFICATEUR DE PUISSANCE 7 page 14-25
MODE D’EMPLOI
AMPLIFICADOR DE POTENCIA 7 página 26-37
MANUAL DE INSTRUCCIONES
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-7251/7201 Serial number
© PRINTED IN CHINA B64-2569-00/00 (KV/EV)
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Installation
Remote controler (KAC-7251 only)
Double-side tape
Remote controler
Remote cable
dB
+6
OFF
+9
+12
Knob
Self-tapping screw
(ø4 × 16 mm)
Self-tapping screw
(ø3 × 12 mm)
Cooling fan
Dressing plate
Washer
Nut
dB
NOTE
+6
+9
OFF
+12
Mount the Dressing plate
according to the mount
angle of the Remote
Controller.
Fully rotate the knob
Installation board, etc.
(thickness : 15 mm or more)
counterclockwise (CCW), and adjust the
marking of the knob to the "OFF" position of
the Dressing plate.
2CAUTION
• 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.
• This unit has cooling fans to decrease the internal temperature. Be careful not to block the
cooling fan openings when installing the unit. 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.
• 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
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Controls / Indicator
(W)
40
20
10
1
2
3
4
5
1 LPF FREQUENCY control
4 OPERATION switch
This switch is used to select the operation
mode of the amplifier.
Sets the cutoff frequency when the FILTER
switch is set to LPF.
• STEREO position:
The amplifier can be used as a stereo
amplifier.
2 FILTER switch
This switch allows to apply high-pass or
low-pass filtering to the speaker outputs.
• MONO (Lch) position:
• HPF (High-Pass Filter) position:
Only frequencies of 150 Hz or higher are
output. (Frequencies below 150 Hz are cut.)
• OFF position:
The entire bandwidth is output without
filtering.
Amplifies the signal input from the left side
only. Set to this position and make bridged
connections to use as a high-power
monaural amplifier. (The input right signal is
not output.)
5 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.
• 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
switched to monaural (L+R).
Use the diagram on the right as a guide.
NOTE
3 BASS BOOST switch
Sets the boost level for bass control.
For the pre-output level or the maximum
power output, refer to the “Specifications”
in the instruction manual of the center unit.
• 12dB position:
BASS BOOST is +12 dB.
• KAC-7201: OFF position:
6 Remote controler control (KAC-
7251 only)
BASS BOOST is OFF.
• KAC-7251: OFF(REMOTE) position:
Can be set from the Remote Controller.
When the "BASS BOOST" switch is in the
"OFF (REMOTE)" position, control the Bass
Boost level from the Remote Controller.
NOTE
• OFF position:
BASS BOOST is OFF.
• +6/+9/+12 position:
Boost the bass sound by +6 dB, +9 dB and
+12 dB, respectively.
If you have disconnected the Remote
Controller, the BASS BOOST is turned OFF.
4 English
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Remote controler
(KAC-7251 only)
dB
+6
+9
OFF
+12
7
6
■ The protection function is
activated in the following
situations:
7 Power indicator
When the power is turned on, the Power
indicator lights.
This unit is equipped with a protection
function for protecting this unit and your
speakers from various accidents or
problems that can occur.
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.
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.
English 5
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Connection
■ Terminal names
8
9
0 !
@
#
$ %
^
&
8 Fuse (30 A × 2)
9 Battery terminal
0 Ground terminal
# RCA cable ground lead terminal
When using an RCA cable with a ground
lead attached, connect the ground lead to
this terminal.
! Power control terminal
$ LINE IN terminal
Controls the unit ON/OFF.
% LINE OUT terminal
The signal that’s input from the line input
terminal is output.
NOTE
Controls the unit power. Be sure to connect
it with all the systems.
^ REMOTE terminal (KAC-7251
only)
@ Speaker output terminals
Connects the Remote cable.
• Stereo Connections:
When you wish to use the unit as a stereo
amplifier, stereo connections are used.
The speakers to be connected should
have an impedance of 2Ω or greater.
When multiple speakers are to be
connected, ensure that the combined
impedance is 2Ω or greater for each
channel.
NOTE
Use the Remote cable of the accessory.
& Speaker level input terminals
NOTE
• The genuine-accessory car stereo shall
have a maximum power output of no
more than 40 W.
• Do not connect the speaker output leads
from a power amplifier (Optional) to the
speaker level 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
level 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.
• Bridged Connections:
When you wish to use the unit as a high-
output monaural amplifier, bridged
connections are used. (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.
2CAUTION
The rated input of the speakers should be
no less than the maximum output of the
amplifier. Otherwise malfunction may
result.
6 English
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■ 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.
■ 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.
2.Set the unit according to the intended usage.
3.Connect the input and output wires of the
units.
• 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.
• 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
4.Connect the speaker wires.
5.Connect the power wire, power control wire
and grounding wire following this order.
6.Install the unit in the car.
7.Connect the negative - terminal of the
battery.
2WARNING
To prevent fire caused by a short in the wiring,
connect a fusible link or breaker nearby the
battery’s positive terminal.
2CAUTION
• 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.
2
diameter of 5 mm (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.
• 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.
■ 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.
• 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.
• After installation, check that the brake
lamps, winkers, and wipers work properly.
4Ω
4Ω
4Ω
4Ω
2 Ω
8 Ω
Combined impedance
English 7
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Connection
■ RCA cable or Speaker level input connection
(RCA cable Connections)
RCA cable ground terminal
#
RCA cable*
GND
#
$
CENTER UNIT
(CD receiver, etc.)
Right input
Left input
Power control wire
(Blue/ White)
(Speaker level input Connections)
Cable Color of the connector
Genuine-accessory car
stereo (No line output
center unit etc.)
White
Left
White/Black
Gray
Right
Car fuse box
Gray/Black
&
Battery
ACC
■ Remote cable connection (KAC-7251 only)
Remote cable
^
Remote controler
8 English
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* Commercially available parts
■ Speaker wire connection
(Stereo Connections)
Left
speaker
@
@
Right
speaker
Lead terminal*
(Bridged Connections)
Speaker (Bridged)
@
■ Power wire connection
9
0
!
Lead terminal*
Terminal cover
Extension wire*
Battery wire*
Ground wire*
Protective Fuse*
Battery
English 9
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System examples
■ 2-channel system
Left speaker
L
L
CENTER UNIT
R
R
Right speaker
2
3
4
■ High-power 2-channel system
¡
L
L
L
Left speaker (Bridged)
Right speaker (Bridged)
R
R
CENTER UNIT
L
L
R
R
R
™
¡
™
2
3
4
■ 2-channel + Subwoofer system
¡
Left speaker (High pass)
Right speaker (High pass)
L
L
CENTER UNIT
R
R
LINE OUT
Subwoofer
(L + R)
(Bridged)
L
L
R
R
™
¡
™
2
3
3
4
4
2
10 English
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■ Tri-mode
L
C
C
L
L
Subwoofer
(L + R) (Bridged)
(High pass)
CENTER UNIT
R
R
2
3
4
●Principle of Tri-mode
Method of frequency band division using a coil and capacitor…in case of 6dB/oct. slope
Coil (L): Passes low frequencies and blocks high
Crossover Frequency
frequencies. (Low pass)
0 dB
Capacitor (C): Passes high frequencies and blocks low
-3 dB
frequencies. (High pass)
L
C
159000
fc x R
159 x R
fc
C=
L=
(µF)
fc=Cut of Frequency (Hz)
R=Speaker Impedance (Ω)
Frequency
(mH)
●Example:
When it is required to set a crossover frequency of 120 Hz using speakers with an
impedance of 4 ohms.
Prepare commercially-available coil and capacitor with the closest ratings to the results
calculated from the formula above. The capacitor rating should be as close as possible to 331.25
(µF) and the coil rating should be as close as possible to 5.3 (mH).
2CAUTION
• If you wish to bridge-connect a speaker, the speaker impedance must be no less than 4 ohms.
Connecting a speaker with an impedance lower than 4 ohms may damage the unit.
• Be sure to connect capacitors to speakers to which high frequencies will be passed. Failure to
do so will result in a drop of the combined impedance with the subwoofer.
• Ensure that the withstand voltage and current ratings of the capacitors (C) and coils (L) are
sufficient.
English 11
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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.
(No sound from one side.)
• Input (or output) cables are
disconnected.
• Connect the input (or output)
cables.
• Protection circuit may be
activated.
• Check connections by referring
to "Indicator".
• Replace the fuse and use lower
volume.
• After check the speaker cord and
fixing the cause of the short,
replace the fuse.
(Blown fuse.)
• Volume is too high.
• 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 "System examples".
The Remote Controller
does not function.
• The "BASS BOOST" switch is in • Set the "BASS BOOST" switch to
the incorrect position.
• The Remote Cable is
disconnected.
the "OFF (REMOTE)" position.
• Connect the Remote Cable
securely and correctly.
12 English
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Specifications
Specifications subject to change without notice.
Audio Section
Max Power Output ............................................................................................................800 W × 1
Rated Power Output
Normal (4 Ω) (20 Hz – 20 kHz, 0.08 % THD)....................................................................150 W × 2
Normal (4 Ω) (DIN : 45324 , +B = 14.4V) ........................................................................150 W × 2
Normal (2 Ω) (1 kHz, 0.8 % THD) ....................................................................................230 W × 2
Bridged (4 Ω) (1 kHz, 0.8 % THD) ....................................................................................460 W × 1
Frequency Response (+0, –3 dB)..................................................................................5 Hz – 50 kHz
Sensitivity (rated output) (MAX.) ................................................................................................0.2 V
Sensitivity (rated output) (MIN.) ................................................................................................5.0 V
Signal to Noise Ratio................................................................................................................100 dB
Input Impedance........................................................................................................................10 kΩ
Low Pass Filter Frequency (18 dB/oct.) ............................................................50 – 200 Hz (variable)
High Pass Filter Frequency (12 dB/oct.) ..................................................................................150 Hz
Bass Boost Circuit (90 Hz) KAC-7251 ............................................................OFF / +6 / +9 / +12 dB
Bass Boost Circuit (90 Hz) KAC-7201 ............................................................................OFF / +12 dB
General
Operating Voltage ..................................................................................14.4 V (11 – 16 V allowable)
Current Consumption (4 Ω, 10 % THD) ......................................................................................43 A
Dimensions (W × H × D) ......................................................................................285 × 57 × 305 mm
....................................................................................................................11-1/4 × 2-1/4 × 12 inch
Weight ......................................................................................................................3.32 kg (7.3 lbs)
English 13
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