STEREO/BRIDGEABLE POWER AMPLIFIER
KAC-7252
KAC-7202
INSTRUCTION MANUAL
© B64-3013-00/00 (MV)
Installation
ꢀꢁꢂ MM
ꢀꢃꢂ MM
Accessories
Part name
External View Number of Items
Œꢄ
Self-tapping screws
(ø5 × 18 mm)
4
Terminal cover (Power terminal)
Speaker level input cable
Hexagon Wrench
1
1
1
KAC-7252 only
Part name
External View Number of Items
Remote cable
1
Remote controller
1
Mounting bracket
1
2
Self-tapping screws
(ø2.6 × 12 mm)
NOTE
• The rear side cover is fixed and cannot be
removed.
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.
Front side cover
Hexagon socket
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.
head cap screw
(M4 × 8 mm)
Hexagon Wrench
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.Install the remote controller. (KAC-7252 only)
9.Connect the negative - terminal of the battery.
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 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.
• 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.
Cooling fan
Self-tapping screw
(ø5 × 18 mm)
Installation board, etc.
(thickness : 15 mm or more)
■ Remote controller (KAC-7252 only)
Mounting bracket
Remote controller
Self-tapping screw
(ø2.6 × 12 mm)
English 3
Connection
2WARNING
■ RCA cable or Speaker level input connection
To prevent fire caused by a short in the wiring,
connect a fusible link or breaker nearby the
battery’s positive terminal.
• RCA cable Connections
Power control wire
2CAUTION
CENTER UNIT
(CD receiver, etc.)
RCA cable*
• 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.
RCA cable ground terminal
Left input
'.$
• 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.
Right input
• Speaker level input Connections
Car fuse box
Cable Color of the connector
NOTE
Genuine-accessory car
9
·
9
·
White
stereo (No line output
center unit etc.)
Left
• 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.
White/Black
Gray
Gray/Black
ACC
Right
Battery
* Commercially available parts
■ Power wire and Speaker wire connection
Power control wire
Lead terminal*
Terminal cover
Right speaker
Left speaker
Battery wire*
Protective Fuse*
■ Bridged Connections
Speaker (Bridged)
Battery
Ground wire*
■ Remote cable connection (KAC-7252 only)
2CAUTION
• Before connecting the remote controller
cables, always set the Bass boost level control
to "0dB".
Remote cable
Remote controller
4 English
Controls
Remote controller
(KAC-7252 only)
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malfunction or damage.
^ OPERATION switch
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.
This switch is used to select the operation mode
of the amplifier.
The control panel locates under the front side
cover. Remove the cover to access to its controls
for adjustment. (See page 3)
• STEREO position:
The amplifier can be used as a stereo amplifier.
• 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.
• MONO (Lch) position:
1 Fuse (40 A ×1)
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.)
NOTE
If you can’t find the specified capacity fuse at your
store etc., consult your Kenwood dealer.
2 Battery terminal
3 Ground terminal
& 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.
8 RCA cable ground lead terminal
When using an RCA cable with a ground lead
attached, connect the ground lead to this
terminal.
4 Power control terminal
Controls the unit ON/OFF.
NOTE
9 LINE IN terminal
Use the diagram on the right as a guide.
Controls the unit power. Be sure to connect it
with all the systems.
0 LINE OUT terminal
The signal that’s input from the line input
terminal is output.
NOTE
For the pre-output level or the maximum power
output, refer to the <Specifications> in the
instruction manual of the center unit.
5 Speaker output terminals
! Power indicator
• Stereo Connections:
When the power is turned on, the Power
indicator lights.
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.
* BOOST LEVEL (Bass boost level) control
(KAC-7252 only)
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. (See page 2)
Sets the level by which the low frequency range
should be boosted.
( FREQUENCY (Bass boost frequency)
control (KAC-7252 only)
@ BASS BOOST LEVEL control (KAC-7202
only)
Sets the center frequency around which the low
frequency range should be boosted.
• 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.)
Sets the low frequency level to be compensated.
# LPF FREQUENCY control
Sets the cutoff frequency when the "FILTER"
switch is set to "LPF".
$ HPF FREQUENCY control
Sets the cutoff frequency when the "FILTER"
switch is set to "HPF".
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.
% FILTER switch
This switch allows to apply high-pass or low-pass
filtering to the speaker outputs.
2CAUTION
The rated input of the speakers should be no
less than the maximum output of the amplifier.
Otherwise malfunction may result.
• HPF (High-Pass Filter) position:
The filter outputs the band of higher
frequencies than the frequency set with the
"HPF FREQUENCY" control.
• OFF position:
The entire bandwidth is output without
filtering.
• 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).
6 REMOTE terminal (KAC-7252 only)
Connects the Remote cable.
NOTE
Use the Remote cable of the accessory.
7 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
English 5
System examples
■ 2-channel system
■ High-power 2-channel subwoofer system
f
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Left subwoofer (Bridged)
Right subwoofer (Bridged)
Left speaker
ꢀ
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,
,
CENTER UNIT
CENTER UNIT
Right speaker
,
,
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ꢀ
,
,
,
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■ 2-channel + Subwoofer system
f
Left speaker (High pass)
Right speaker (High pass)
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CENTER UNIT
,
,
,).% /54
Subwoofer
(L + R)
(Bridged)
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f
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■ Tri-mode
Principle of Tri-mode
Method of frequency band division using a coil and capacitor…in case of 6dB/oct. slope.
Subwoofer
(L + R) (Bridged)
(High pass)
Coil (L):
Crossover Frequency
Passes low frequencies and blocks high
#
#
0 dB
,
frequencies. (Low pass)
ꢀ
ꢀ
-3 dB
CENTER UNIT
Capacitor (C):
Passes high frequencies and blocks low
frequencies. (High pass)
,
,
L
C
Frequency
159000
159 x R
fc
fc=Cut of Frequency (Hz)
R=Speaker Impedance (Ω)
L=
(mH)
C=
(µF)
fc × R
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.
6 English
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 disconnected.
• Protection circuit may be activated.
• Volume is too high.
• Connect the input (or output) cables.
• Check connections by referring to <Protection function>.
• Replace the fuse and use lower volume.
• After check the speaker cord and fixing the cause of the short,
replace the fuse.
(No sound from one side.)
(Blown fuse.)
• The speaker cord is shorted.
The output level is too small • The input sensitivity adjusting control is not set to the correct • Adjust the control correctly referring to <Controls>.
(or too large).
position.
The sound quality is bad.
(The sound is distorted.)
• The speakers wire are connected with wrong + /-polarity.
• A speaker wire is pinched by a screw in the car body.
• The switches may be set improperly.
• Connect them properly checking the + / - of the terminals
and wires well.
• Connect the speaker wire again so that it is not pinched by
anything.
• Set switches properly by referring to <System examples>.
• Connect the Remote Cable securely and correctly.
• Adjust the "BOOST LEVEL".
The Remote Controller does • The Remote Cable is disconnected.
not function.
• The "BOOST LEVEL" is set to "0dB".
Specifications
Specifications subject to change without notice.
Audio Section........................................................................................................................KAC-7252 KAC-7202
Max Power Output......................................................................................................................................................................................1000 W 920 W
Rated Power Output (+B = 14.4 V)
Normal (4 Ω) (20 Hz – 20 kHz, 0.08 % THD)..............................................................................................................170 W × 2 150 W × 2
Normal (4 Ω) (DIN : 45324 , +B = 14.4V).....................................................................................................................170 W × 2 150 W × 2
Normal (2 Ω) (1 kHz, 0.8 % THD).....................................................................................................................................250 W × 2 230 W × 2
Bridged (4 Ω) (1 kHz, 0.8 % THD)....................................................................................................................................500 W × 1 460 W × 1
Sensitivity (rated output) (MAX.) ..............................................................................................................................................................0.2 V 0.2 V
Sensitivity (rated output) (MIN.) ...............................................................................................................................................................5.0 V 5.0 V
Input Impedance ............................................................................................................................................................................................ 10 kΩ 10 kΩ
Frequency Response (+0, –3 dB)...........................................................................................................................................5 Hz – 50 kHz 5 Hz – 50 kHz
Signal to Noise Ratio................................................................................................................................................................................≤100 dB ≤100 dB
Low Pass Filter Frequency (24 dB/oct.) .............................................................................................................50 – 200 Hz (variable) 50 – 200 Hz (variable)
High Pass Filter Frequency (12 dB/oct.)............................................................................................................50 – 200 Hz (variable) 50 – 200 Hz (variable)
Bass Boost Circuit............................................................................................................................................................0 – +18 dB (variable) 0 – +18 dB (variable)
Bass Boost Frequency.................................................................................................................................................40 – 100 Hz (variable) 40 Hz
General ..................................................................................................................................KAC-7252 KAC-7202
Operating Voltage ........................................................................................................................................... 14.4 V (11 – 16 V allowable) 14.4 V (11 – 16 V allowable)
Current Consumption .....................................................................................................................................................................................40 A 40 A
Installation Size (W × H × D) ..................................................................................................................................... 380 × 61 × 286 mm 380 × 61 × 286 mm
Weight ..................................................................................................................................................................................................................5.8 kg 5.7 kg
English 7
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