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Controls
FUSE (30A)
POWER IN
·
SERVO II
SPEAKER OUTPUT
GND
30
BATT
P.CON(REMOTE)
1
2 3
4
5
Operations of the following control and switches
are required in accordance with the centre unit
and speakers connected with this unit.
1 FUSE (30 A ´ 1)
2 Battery terminal
3 Ground terminal
4 Power control (REMOTE) terminal
5 Speaker output terminals
As this unit accepts speakers with a minimum
impedance of 2 ohms, connect speakers with
2-ohm or higher impedance to these terminals.
2CAUTION
The rated input of the speakers should be no
less than the maximum output of the amplifier.
Otherwise malfunction may result.
6 SIGMA SERVO II terminals
2CAUTION
Be sure to make proper connections to the
SIGMA SERVO II terminals. Incorrect
connection may result in lack of sound output
or other malfunctions.
7 INFRASONIC FILTER switch
Ultralow frequencies that cannot be reproduced
even by a subwoofer speaker do not become
sound but become unnecessary oscillations,
which affect the sound by causing distortion,
Connection
NOTE
For safe installation, read "Installation procedure" before starting work.
RCA cable connection
CENTER UNIT (Cassette receiver,
CD receiver, etc.)
RCA cable*
!
15Hz
6dB
OFF
25Hz
OFF
12dB
120
0.5
100
150
INFRASONIC
BASS
0.3
BOOST
1
GND
70
170
2
3
4
50
200
5
0.2
LPF
INPUT
FREQUENCY(Hz)
SENSITIVITY(V)
Power control wire*
Lead terminal*
POWER IN
FUSE (30A)
30
GND
BATT
2 3
Terminal cover
Battery wire*
+
-
Protective Fuse*
Battery
Speaker level input terminals ( # )
When the genuine-accessory car stereo power is turned ON/OFF, check that the power to this unit
has followed suit.
In some cases, the power control is not correctly operated by the genuine-accessory car stereo. If
this is the case, connect the ACC or power control signal to the P.CON(REMOTE) terminal.
2CAUTION
• 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.
·
15Hz
SERVO II
OFF
25Hz
INFRASONIC
15Hz
6dB
120
0.5
6
100
OFF
25Hz
OFF
12dB
150
1
70
170
2
3
INFRASONIC
BASS
4
50
200
5
BOOST
LPF
INPUT
FREQUENCY(Hz)
SENSITIVITY(V)
7
8
9
0
etc. Setting this switch to "15 Hz" or "25 Hz"
cuts the frequencies below the respective
frequency.
This improves the reproduction performance of
the speakers by eliminating unnecessary
oscillations which will not become sound.
8 BASS BOOST switch
Setting this switch to "+6dB" or "+12dB"
emphasizes the bass.
9 LPF(Low-Pass Filter) FREQUENCY
control
This control adjusts the frequency band output
from this unit.
0 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.
NOTE
For the pre-output level or the maximum power
output, refer to the "Specifications" in the
instruction manual of the center unit.
! RCA cable ground lead terminal
When using an RCA cable with a ground lead
attached, connect the ground lead to this terminal.
2CAUTION
*...Commercially available parts
Speaker level input connection
Genuine-accessory car stereo (No
line output center unit etc.)
Speaker
#
L E
E R
K
E A
S P
F T
L E
SPEAKER LEVEL INPUT
LINE IN
LEFT
RIGHT
L
R
SUBWOOFER
AMPLIFIER
ACC
Car fuse box
Lead terminal*
4
II
O
R V
56
S E
·
U T
T P
O U
R
K E
E A
S P
·
·
II
SERVO II
SPEAKER OUTPUT
SERVO II
O
R V
S E
·
P.CON(REMOTE)
Subwoofer
Distribute the speaker wires and sigma
servo wires along the same paths.
Ground wire*
6dB
SPEAKER LEVEL INPUT
OFF
12dB
LINE IN
LEFT
RIGHT
120
0.5
L
R
100
150
BASS
0.3
BOOST
1
GND
70
170
2
3
4
50
200
5
0.2
LPF
INPUT
FREQUENCY(Hz)
SENSITIVITY(V)
!
@
#
0.3
0.2
Do not use this terminal for power source
grounding. This unit will be damaged if the power
source grounding wire is connected to this
terminal.
@ LINE IN terminal
# Speaker level input terminals
A center unit with no RCA output can still be
connected to the speaker output.
Again, even without a power control signal, the
power is switched ON/OFF automatically by
the speaker signal.
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.
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.
Sigma servo feed back
The sound reproduced through conventional amplifiers is distorted due to the
counterelectromotive force produced in the oscillating system of the speaker. The
counterelectromotive force is particularly high with the woofer which requires a large drive
mass.The sigma servo connection reduces distortion caused by the counterelectromotive
force by including the circuit up to the speaker terminals in the negative feedback loop. This
makes it possible to drive speakers with more fidelity to the input signals and create a sharp
bass sound image with few feeling of noise interference.
NOTE
The speaker wires and sigma servo wires should be distributed along the same paths.
2CAUTION
• The extension of the negative feedback loop to include the speaker terminals makes it
necessary to connect the sigma servo terminals correctly. Incorrect connection may result in
sound degradation or other malfunction. If sound is not reproduced normally, check the
T
P U
IN
H T
L
V E
R IG
connection of the sigma servo terminals, etc.
• If the Sigma servo terminals are not connected, the sound may fluctuate or noise may
occur.
Be sure to connect the Sigma servo terminals correctly.
• When connecting speakers in a parallel configuration, use speakers with an impedance of 4
ohms or more. Connecting speakers with smaller impedance than 4 ohms will cause
malfunction.
• The rated input of the speakers connected to this unit should be no less than the maximum
output of the amplifier. Otherwise malfunction may result.
Be specially careful in this when connecting speakers in a parallel configuration.
Battery
Basic sigma servo connection
Parallel connection (1)
2CAUTION
The speaker wires connected to this unit
should be thick enough to supply the current
capacity of two speakers.
Simplified sigma servo connection
0
10
0.5
15
0.3
SUBWOOFER
1
AMPLIFIER
2
3
4
5 (V)
0.2
(W)
Power indicator
25W or greater
• A speaker wire may be short-circuited.
• A speaker output may be in contact with the
• When the internal temperature is high and
• The sigma servo connection may be
• The fuse of this unit may be blown.
• The unit may be malfunctioning and sending
• The grounding wire of this unit may not be
• The power control wire may not be connected
• The grounding wire of the centre unit
In case any of the connection examples above cannot be
used or if the speakers cannot be connected to the
speaker terminals, connect them to this unit as shown in
the figure.
SUBWOOFER
AMPLIFIER
KAC-819
MAXIMUM POWER
ground.
unit won't operate.
erroneous.
DC signal to the speaker output.
connected with a metallic part which is
electrically connected with the negative
terminal of the battery.
to this unit.
(cassette receiver, CD receiver, etc.) may not
be connected with a metallic part which is
electrically connected with the negative
terminal of the battery.
Series connection
2CAUTION
Make this wire as short as possible.
Parallel connection (2)
2CAUTION
This connection is possible only when the
speakers are identical and the speaker
wires are also of the same type and length.
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