Power Indicator; Controls; System Examples; Connection - Kenwood KAC-929 Instruction Manual

Controls

POWER IN
SPEAKER BRIDGED
OUTPUT
BATT. P.CON LEFT
1 2 3 4 5
Operations of the following control and switches
are required in accordance with the center unit
and speakers connected with this unit.
1 Fuse (30 A × 2)
2 Battery terminal
3 Ground terminal
4 Power control terminal
5 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.)
6 BASS BOOST switch
Setting this switch to "+6dB" or "+12dB"
emphasizes the bass.
7 EXPANDER switch
When this switch is turned ON the dynamic
range is increased.

System examples

■ 2-channel system
Left speaker
CENTER L L
UNIT
Right speaker
R R
6 7 8 9
BASS BOOST
EXPANDER LOW PASS FILTER OPERATION
6dB
OFF ON OFF ON STEREO MONO(Lch)
OFF 12dB
■ Subwoofer system
CENTER
Left speaker
UNIT
Right speaker
L L
Subwoofer
R R
6 7 8 9
BASS BOOST
EXPANDER LOW PASS FILTER OPERATION
6dB
OFF ON OFF ON STEREO MONO(Lch)
OFF 12dB
■ 1-channel system
L
L L
Left speaker
CENTER
R R
UNIT
L L
R Right speaker
R R
6 7 8 9
BASS BOOST
EXPANDER LOW PASS FILTER OPERATION
6dB
ON ON
OFF OFF STEREO MONO(Lch)
OFF 12dB
■ Tri-mode
L
High pass
C
CENTER L L
UNIT
R R
C
6 7 8 9
BASS BOOST
EXPANDER LOW PASS FILTER OPERATION
6dB
OFF ON OFF ON STEREO MONO(Lch)
12dB
OFF
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)
RIGHT
POWER AMPLIFIER
BASS BOOST
EXPANDER LOW PASS FILTER OPERATION
6dB
OFF ON OFF ON
STEREO MONO(Lch)
OFF 12dB
6 7 8 9
8 LOW 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.
9 OPERATION 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.)
0 LPF 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.

Connection

NOTE
■ RCA cable connection
CENTER UNIT (Cassette receiver,
CD receiver, etc.)
@
■ Speaker stereo connection
Lead terminal*
5
E D
ID G
B R
F T
L E
Crossover Frequency
0 dB
Subwoofer
-3 dB
(L + R)
L
159000 159000
C= (µF) = = 331.25 µF
fc x R 120Hz x 4Ω
159 x R 159 x 4Ω
L= (mH) = = 5.3 mH
fc 120Hz
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.
0 ! @ # $
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
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
For safe installation, read "Installation procedure" before starting work.
RCA cable*
Power control wire*
4
POWER IN
SPEAKER BRIDGED
OUTPUT
BATT. P.CON LEFT RIGHT
H T
R IG
Left speaker Right speaker
■ Power wire connection
C
Frequency
Battery wire*
Protective Fuse*
!
1
40
0.5
2
20
3
0.3 10
4
(W)
(MIN)5 0.2(MAX)
INPUT
SENSITIVITY(V)

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.
■ Speaker level input connection
Genuine-accessory car stereo (No
line output center unit etc.)
Car fuse box
Battery
■ Speaker bridge connection
Lead terminal*
5
H T
R IG
E D
ID G
POWER AMPLIFIER
B R
F T
L E
POWER IN
BRIDGED
SPEAKER
OUTPUT
BATT. P.CON LEFT RIGHT
POWER AMPLIFIER
2 3 4
Lead terminal*
Terminal cover
Power control wire*
Ground wire*
Battery
Cooling fan
STEREO/BRIDGEABLE
AMPLIFIER
KAC-929
MAXIMUM POWER
Power indicator
*...Commercially available parts
Gray
Gray/Black
Right
Left
White/Black
White
ACC
4
POWER IN
SPEAKER BRIDGED
OUTPUT
BATT. P.CON LEFT RIGHT
POWER AMPLIFIER
Subwoofer