System examples
L
R
L
R
L
R
L
R
L
R
L
R
L
R
L
R
L
R
6789
ON
OFF
EXPANDER
MONO(Lch)
STEREO
OPERATION
ON
OFF
LOW PASS FILTER
12dB
OFF
6dB
BASS BOOST
6789
ON
OFF
EXPANDER
MONO(Lch)
STEREO
OPERATION
ON
OFF
LOW PASS FILTER
12dB
OFF
6dB
BASS BOOST
6789
ON
OFF
EXPANDER
MONO(Lch)
STEREO
OPERATION
ON
OFF
LOW PASS FILTER
12dB
OFF
6dB
BASS BOOST
POWER AMPLIFIER
LEFT
BRIDGED
SPEAKER
OUTPUT RIGHT
POWER IN
P.CONBATT.
GND
30
30
FUSE(30Ax2)

432

Operations of the following control and switches
are required in accordance with the center unit
and speakers connected with this unit.

1Fuse (30 A ×2)

2Battery terminal

3Ground terminal

4Power control terminal

5SPEAKER 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.)

6BASS BOOST switch

Setting this switch to "+6dB" or "+12dB"
emphasizes the bass.

7EXPANDER switch

When this switch is turned ON the dynamic
range is increased.

8LOW PASS FILTER switch

These switches allow filtering of the speaker
output signals.

•OFF position:

The entire bandwidth is output without filtering.

•ON position:

The filter outputs the band of lower frequencies
than the frequency set with the LPF
FREQUENCY control.

9OPERATION switch

This switch allows selection of the amplification
method of input signals.

•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.)

0LPF FREQUENCY control

Sets the cutoff frequency when the LOW PASS
FILTER switch is set to ON.

!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.
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.

#LINE IN terminal

$Speaker level input terminals

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.
2CAUTION
NOTE
Controls
POWER AMPLIFIER
LEFT
BRIDGED
SPEAKER
OUTPUT RIGHT
POWER IN
P.CONBATT.
GND
30
30
FUSE(30Ax2)

!

ON
OFF
EXPANDER
MONO(Lch)
STEREO
OPERATION
ON
OFF
LOW PASS FILTER
12dB
OFF
6dB
BASS BOOST
KAC-929
STEREO
/
BRIDGEABLE
AMPLIFIER
MAXIMUM POWER
1 #2 3 4 ! @5 $0
6 7 8 9
0.2(MAX)(MIN)5
0.3
0.5
1
2
3
4
SENSITIVITY(V)
INPUT
(W)
20
40
10
Power indicator
Terminal cover
Battery
Ground wire*
Battery wire*
Protective Fuse*
Power control wire*

■Power wire connection

L
R
L
R
L
C
C
6789
ON
OFF
EXPANDER
MONO(Lch)
STEREO
OPERATION
ON
OFF
LOW PASS FILTER
12dB
OFF
6dB
BASS BOOST
Connection
For safe installation, read "Installation procedure" before starting work.
NOTE
POWER AMPLIFIER
LEFT
BRIDGED
SPEAKER
OUTPUT RIGHT
POWER IN
P.CONBATT.
GND
30
30
FUSE(30Ax2)
POWER AMPLIFIER
LEFT
BRIDGED
SPEAKER
OUTPUT RIGHT
POWER IN
P.CONBATT.
GND
30
30
FUSE(30Ax2)
LEFT
BRIDGED
RIGHT
LEFT
BRIDGED
RIGHT

4

5

5

4

GND

@

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*
Subwoofer
Lead terminal*
Right speaker
Left speaker

■2-channel system

■1-channel system

■Subwoofer system

■RCA cable connection ■Speaker level input connection

■Speaker stereo connection ■Speaker bridge connection

CENTER
UNIT
CENTER
UNIT
CENTER
UNIT

■Tri-mode

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 frequencies. (Low pass)
Capacitor (C): Passes high frequencies and
blocks low frequencies. (High pass)
Example:
When it is required to set a crossover
frequency of 120 Hz using speakers with an
impedance of 4 ohms.
fc=Cut of Frequency (Hz)
R=Speaker Impedance (Ω)
•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.
2CAUTION
LC
0 dB
-3 dB
Crossover Frequency
Frequency
CENTER
UNIT
High pass
Subwoofer
(L + R)
159000
C= (µF)
fc x R
159 x R
L= (mH)
fc
159000
= = 331.25 µF
120Hz x 4Ω
159 x 4Ω
= = 5.3 mH
120Hz
Left speaker
Right speaker
Left speaker
Right speaker
Left speaker
Right speaker
Subwoofer
Lead terminal*
*…Commercially available parts
White/Black
Gray
White
Gray/Black
Left
Right
Cooling fan
KAC-929(KE)1En 02.12.16 11:38 AM Page 2