Power Indicator; System Examples - Kenwood KAC-649S Instruction Manual

Controls
POWER IN BRIDGED
SPEAKER
LEFT
FUSE(25A) BATT. P.CON OUTPUT
1 2 3 4 5
This is a 4 channel amplifier including 2 stereo
amplifiers in a body. One amplifier is referred to as
amplifier A and the other is amplifier B. This unit is
compatible with a large variety of systems by
combining the switches and functions described
in the following.
1 Fuse (25 A)
2 Battery terminal
3 Ground terminal
4 Power control terminal
5 Amplifier 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.)
6 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.
The sensitivities of amplifiers A and B can be
adjusted independently regardless of the position
of the input selector switch.
Use the diagram on the right as a guide.

System examples

4-channel 4-channel
F
L
A
A
CENTER R
UNIT R
L
B
R
B
INPUT SELECTOR
A.CH OPERATION B.CH OPERATION
MONO (Lch) MONO (Lch) A B A
STEREO STEREO
A.CH FILTER
! #
OFF
HPF
2-channel
L
CENTER
A
R
UNIT
L
B
R
3-channel
INPUT SELECTOR
A.CH OPERATION B.CH OPERATION
A B A
STEREO MONO (Lch) STEREO MONO (Lch)
A
! #
B
2ch + woofer
L
A.CH FILTER
A
CENTER
R OFF
HPF
UNIT
L
B
R
INPUT SELECTOR
A.CH OPERATION B.CH OPERATION
A B A
STEREO MONO (Lch) STEREO MONO (Lch)
! #
2-channel 2-channel
L
CENTER A
A
R
UNIT
L
B
B
R
INPUT SELECTOR
A.CH OPERATION B.CH OPERATION
A B A A.CH FILTER
STEREO MONO (Lch) STEREO MONO (Lch)
OFF
! #
HPF
Tri-mode
C
L
L L
CENTER A
R R
UNIT
C
C
L
L L
B
R R
C
A.CH FILTER B.CH FILTER
INPUT SELECTOR
A.CH OPERATION B.CH OPERATION
OFF OFF
A B
STEREO MONO (Lch) STEREO MONO (Lch)
HPF LPF HPF LPF
! @
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 (½)
A.CH OPERATION
RIGHT
STEREO
A
B
POWER AMPLIFIER
A.CH FILTER B.CH FILTER
B.CH OPERATION INPUT SELECTOR
A.CH OPERATION
OFF OFF
STEREO MONO (Lch) STEREO MONO (Lch)
HPF LPF HPF LPF
! @
NOTE
For the pre-output level or the maximum power
output, refer to the "Specifications" in the
instruction manual of the center unit.
7 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.
8 Amplifier A/B LINE IN terminals
9 LINE OUT terminal
These jacks output respectively the signals input to
amplifiers A and B. They always output the stereo
signals regardless of the position of the
OPERATION switch.
0 Speaker level input terminals
! OPERATION switch
The amplification methods of the signals input to
amplifiers A and B can be selected independently
according to the setting of this switch.
• 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.)
Connection
NOTE
RCA cable connection
Front left speaker
L
R Front right speaker
Rear left speaker
L
R
Rear right speaker
B.CH FILTER
OFF
LPF HPF LPF
@
Left speaker
L
R
Right speaker
L
Subwoofer
R
B.CH FILTER
OFF
LPF LPF
HPF
@
Speaker stereo connection
L
Left speaker
R
L
Right speaker
R
B.CH FILTER
OFF
LPF LPF
HPF
@
Crossover Frequency
0 dB
-3 dB
High pass
L
Subwoofer
(L + R)
159000 159000
C= (µF) = = 331.25 µF
A
fc x R 120Hz x 4½
#
159 x R 159 x 4½
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.
LINE IN LINE OUT
A.CH FILTER B.CH FILTER
B.CH OPERATION INPUT SELECTOR +
A B A B
OFF OFF
MONO (Lch) STEREO MONO (Lch) A B A
HPF LPF HPF LPF
1 1 L
2 0.5 2 0.5
GND
3 3
0.3 0.3 SPEAKER LEVEL INPUT
4 4
(MIN)5 0.2(MAX) (MIN)5 0.2(MAX)
R
A.CH INPUT SENSITIVITY(V) B.CH INPUT SENSITIVITY(V)
L
6 7 8 9 0
A B A
#
@ FILTER switch
These switches allow filtering of the speaker
output signals.
• HPF (High Pass Filter) position
Only frequencies of 150 Hz or higher are output.
(Frequencies below 150 Hz are cut.)
• LPF (Low Pass Filter) position
Only frequencies of 80 Hz or lower are output.
(Frequencies above 80 Hz are cut.)
The Lch and Rch will be mixed before output
even if the operation switch is set to STEREO.
• OFF position
The original sound without filtering is output.
# INPUT SELECTOR switch
This switch selects the input method of the signals
to be amplified by amplifiers A and B.
• A B position:
Amplifies both of the signals input to amplifiers A
and B.
• A position:
Amplifies only signal input amplifier A with both
amplifiers A and B.
For safe installation, read "Installation procedure" before starting work.
CENTER UNIT (Cassette receiver,
CD receiver, etc.)
8
LINE IN
A.CH FILTER B.CH FILTER INPUT SELECTOR
A.CH OPERATION B.CH OPERATION
A
STEREO MONO (Lch) OFF OFF STEREO MONO (Lch) A B A
HPF LPF HPF LPF
1 1
L
2 0.5 2 0.5
GND
3 3
0.3 0.3
4 4
(MIN)5 0.2(MAX) (MIN)5 0.2(MAX)
R
A.CH INPUT SENSITIVITY(V) B.CH INPUT SENSITIVITY(V)
Power control wire*
A L
Lead terminal*
4
5
H T
R IG
E D
ID G
B R
F T
L E
POWER IN BRIDGED
SPEAKER
OUTPUT LEFT RIGHT
FUSE(25A) BATT. P.CON
BRIDGED
A
B
L R
B L
Power wire connection
C
FUSE25A)
Frequency
Battery wire*
Protective Fuse*
6
40
1
30
0.5
2
20
3 10
A
B 0.3
(W)
4
R
(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.
Speaker level input connection
Cable Color of the
connector
White
L
RCA cable*
White/Black
A
Gray
R
Gray/Black
A
Green
L
L
Green/Black
B
R
Purple
L
R
Purple/Black
R
B
LINE OUT
+ A.CH OPERATION
B A B
STEREO
SPEAKER LEVEL INPUT
A
B
L R
Speaker bridge connection
A R
Lead terminal*
5
H T
R IG
E D
ID G
B R
F T
L E
A
B
POWER AMPLIFIER
BRIDGED
A
B
L R
R
B
POWER IN BRIDGED
SPEAKER
OUTPUT LEFT RIGHT
BATT. P.CON
A
B
POWER AMPLIFIER
2 3 4
Lead terminal*
Terminal cover
Power control wire*
Ground wire*
Battery
Power indicator
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.
Genuine-accessory
car stereo (No line
output center unit
etc.)
L R
A
L R
B
LINE IN LINE OUT
A.CH FILTER B.CH FILTER INPUT SELECTOR
B.CH OPERATION +
A B A B
MONO (Lch) OFF OFF STEREO MONO (Lch) A B A
HPF LPF HPF LPF
1 1
L
2 0.5 2 0.5
GND
3 3
0.3 0.3
4 4 SPEAKER LEVEL INPUT
(MIN)5 0.2(MAX) (MIN)5 0.2(MAX) A
R
A.CH INPUT SENSITIVITY(V) B.CH INPUT SENSITIVITY(V)
B
L R
ACC
Battery
Car fuse box
A Bridge
4
POWER IN BRIDGED
SPEAKER
OUTPUT LEFT RIGHT
FUSE(25A) BATT. P.CON
A
B
POWER AMPLIFIER
B
Bridge
Description of markings in the figure.
Left
A
Front left
A L
Front right
A R
Right
B
Rear left
L
B
Rear right
R
B
Front
F
Rear
R
* Commercially available
parts