System examples
BRIDGEDBRIDGED
L
R
L
R
L
R
A
B
SUB
L
R
L
R
L
R
A
B
SUB
N-F
L
R
L
R
L
R
A
B
SUB
L
R
L
R
A
B
SUB
SELECTOR
INPUT
INPUT SELECTOR
MONO(Lch)
STEREO
OPERATION
F
R
F
R
BSUBA
BAA
SELECTOR
INPUT
INPUT SELECTOR
MONO(Lch)
STEREO
OPERATION
BSUBA
BAA
SELECTOR
INPUT
INPUT SELECTOR
MONO(Lch)
STEREO
OPERATION
BSUBA
BAA
B.ch HPF
A.ch HPF
FREQUENCY(Hz)
SUB.CH LPF
170
200
150
100
80
70
50
OFF
150Hz
80HzOFF
150Hz
80Hz
L
R
L
R
L
R
A
B
SUB
L
R
L
R
N-F
L
R
L
R
L
R
A
B
SUB
A
B
SUB
SELECTOR
INPUT
INPUT SELECTOR
MONO(Lch)
STEREO
OPERATION
BSUBA
BAA
SELECTOR
INPUT
INPUT SELECTOR
MONO(Lch)
STEREO
OPERATION
BSUBA
BAA
B.ch HPF
A.ch HPF
FREQUENCY(Hz)
SUB.CH LPF
170
200
150
100
80
70
50
OFF
150Hz
80HzOFF
150Hz
80Hz
9
%
$
9
%
$
9
%
$
9
%
$
9
%
8
#
8
#
$
SUB
SUB
OUTPUT
POWER IN
GND
BATT
P.CON
FUSE(25Ax2)
BRIDGED
RIGHT
LEFT
SPEAKER
SPEAKER LEVEL INPUT
RIGHT
LEFT
25
25
A
B
RL
SPEAKER LEVEL INPUT
A
A
B
B
243
L
A
A
R
L
R
B
A
B
SUB
B
F
R
N-F
/ L
/ R
The unit is a 5-channel amplifier incorporating 2
stereo amplifiers and 1 monaural amplifier in a
single body.
The stereo amplifier on one side is called amplifier
A, while the one on the other side is amplifier B.
The monaural amplifier is called the amplifier SUB.
This unit is compatible with a large variety of
systems by combining the switches and functions
described in the following.

1Fuse (25 A ×2)

2Power control terminal

3Battery terminal

4Ground terminal

5Amplifier A/B speaker output

terminals

•Stereo Connections:

When you wish to use the unit as a stereo
amplifier, stereo connections are used.

•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 (+) and the RIGHT channel
(-) SPEAKER OUTPUT terminals.)

6Amplifier SUB speaker output

terminal

As this unit accepts speakers with a minimum
impedance of 2 ohms, connect speakers with
2-ohm or higher impedance to these terminals.

7Speaker 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.

8HPF(High-Pass Filter) switch

When this switch is set to 80 Hz or 150 Hz,
frequencies below the setting value will be cut.

9INPUT SELECTOR (A/AB) switch

This switch toggles the input signal of amplifier
B.

•A position:

The input for terminal A is output from
amplifiers A and B.

•AB position:

The input for terminal A is output from amplifier
A, while the input for terminal B is output from
amplifier B.

0INPUT 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.
The sensitivities of amplifiers A, B and SUB can
be adjusted independently regardless of the
position of the input selector switch.
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.
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.

@Amplifier A/B/SUB LINE IN terminal

#SUB.CH LPF(Low-Pass Filter)

FREQUENCY control

This control adjusts the frequency band output
from this SUB channel.

$OPERATION switch

This switch is used to select the operation
mode of the amplifier.

•STEREO position:

The amplifier can be used as a stereo amplifier.

•MONO (Lch) position:

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.)

%INPUT SELECTOR (AB/SUB) switch

This switch toggles the input signal of amplifier
SUB.

•AB position:

The input for terminals A and B input is mixed
and output from amplifier SUB.
The input signal varies according to the setting
of the INPUT SELECTOR (A/AB) switch and the
OPERATION switch.

•SUB position:

The input for the SUB terminal is output by
amplifier SUB.
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.
•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.
NOTE
2CAUTION
NOTE
Controls
INPUT
SENSITIVITY(V)
0
SUB
SUB
OUTPUT
POWER IN
GND
BATT
P.CON
FUSE(25Ax2)
BRIDGED
RIGHT
LEFT
SPEAKER
SPEAKER LEVEL INPUT
RIGHT
LEFT
25
25
A
B
RL
SPEAKER LEVEL INPUT
A
A
B
B
SELECTOR
INPUT
INPUT SELECTOR
LINE IN
GND
FREQUENCY(Hz)
SUB.CH LPF
MONO(Lch)
STEREO
OPERATION
5/4/3 CHANNEL
POWER AMPLIFIER
BSUB
A
A
L
R
BSUB
SENSITIVITY(V)
A.CH INPUT
0.3
0.2(MAX)
0.5
1
2
3
4
(MIN)5
SENSITIVITY(V)
B.CH INPUT
0.3
0.2(MAX)
0.5
1
2
3
4
(MIN)5
SENSITIVITY(V)
SUB.CH INPUT
0.3
0.2(MAX)
0.5
1
2
3
4
(MIN)5
170
200
150
100
80
70
50
BAA
OFF
150Hz
80Hz
A.CH H
PF
OFF
150Hz
80Hz
B.CH H
PF
MAXIMUM POWER
SELECTOR
INPUT
INPUT SELECTOR
MONO(Lch)
STEREO
OPERATION
BSUB
A
BAA
OFF
150Hz
80Hz
A.CH HPF
OFF
150Hz
80Hz
B.CH HPF
1 2 3 4 #7
0
8 9 $ %
(W)
25
15
10
0.3
0.2
(MAX)
0.5
1
2
3
4
(MIN)
5
5 6 !@
40
Power indicator
Terminal cover
Battery
Ground wire*
Battery wire*
Protective Fuse*
Power control wire*

■Power wire connection

Connection
For safe installation, read "Installation procedure" before starting work.
NOTE
SUB
SUB
OUTPUT
POWER IN
GND
BATT
P.CON
FUSE(25Ax2)
BRIDGED
RIGHT
LEFT
SPEAKER
SPEAKER LEVEL INPUT
RIGHT
LEFT
25
25
A
B
RL
SPEAKER LEVEL INPUT
A
A
B
B
SUB
SUB
OUTPUT
POWER IN
GND
BATT
P.CON
FUSE(25Ax2)
BRIDGED
RIGHT
LEFT
SPEAKER
SPEAKER LEVEL INPUT
RIGHT
LEFT
25
25
A
B
RL
SPEAKER LEVEL INPUT
A
A
B
B
SUB
SUB
OUTPUT
POWER IN
GND
BATT
P.CON
FUSE(25Ax2)
BRIDGED
RIGHT
LEFT
SPEAKER
SPEAKER LEVEL INPUT
RIGHT
LEFT
25
25
A
B
RL
SPEAKER LEVEL INPUT
A
A
B
B
SELECTOR
INPUT
INPUT SELECTOR
LINE IN
GND
FREQUENCY(Hz)
SUB.CH LPF
MONO(Lch)
STEREO
OPERATION
5/4/3 CHANNEL
POWER AMPLIFIER
BSUB
A
A
L
R
BSUB
SENSITIVITY(V)
A.CH INPUT
0.3
0.2(MAX)
0.5
1
2
3
4
(MIN)5
SENSITIVITY(V)
B.CH INPUT
0.3
0.2(MAX)
0.5
1
2
3
4
(MIN)5
SENSITIVITY(V)
SUB.CH INPUT
0.3
0.2(MAX)
0.5
1
2
3
4
(MIN)5
170
200
150
100
80
70
50
BAA
OFF
150Hz
80Hz
A.CH H
PF
OFF
150Hz
80Hz
B.CH H
PF
22
L
L
A
A
L
A
A
B
R
B
R
LR
RL
R
AR
B
B
L
B
SUB
SUB SUB
A
B
BRIDGED
A
B
BRIDGED

!

56 56

GND
LEFT
BRIDGED
RIGHT SUB
LEFT
BRIDGED
RIGHT SUB
LRSUB LRSUB
LEFT RIGHT
SPEAKER LEVEL INPUT

7

CENTER UNIT(Cassette receiver,
CD receiver, etc.)
Power control wire*
RCA cable*
Genuine-accessory car stereo (No
line output center unit etc.)
ACC
Battery
Car fuse box
Lead terminal* Lead terminal*

■5-channel system

■3-channel system

■RCA cable connection ■Speaker level input connection

■Speaker stereo connection ■Speaker bridge connection

CENTER
UNIT
CENTER
UNIT
CENTER
UNIT
CENTER
UNIT
CENTER
UNIT
Left speaker
Right speaker
Subwoofer
Lead terminal*
Subwoofer
Front left speaker
Front right speaker
Rear left speaker
Rear right speaker
Left
Front left
Front right
Right
Rear left
Rear right
Subwoofer
Front
Rear
Non-fader
*Commercially available
parts
Bridge
Bridge
Description of markings in the figure.
KAC-959(KE)1En 02.12.16 11:41 AM Page 2