kac-749s ETC-unknow, kac-749s Datasheet - Page 2

• Manufacturer Part Number: kac-749s
• Description: 4-channel Power Amplifier
• Manufacturer: ETC-unknow

Controls
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
2 Battery terminal
3 Ground terminal
4 Power control terminal
5 Amplifier A/B SPEAKER OUTPUT
6 INPUT SENSITIVITY control
System examples
Principle of Tri-mode
Example:
STEREO
STEREO
STEREO
STEREO
STEREO
Method of frequency band division using a coil
and capacitor
Coil (L): Passes low frequencies and blocks
high frequencies. (Low pass)
Capacitor (C): Passes high frequencies and
blocks low frequencies. (High pass)
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)
CENTER
CENTER
CENTER
A.CH
CENTER
A.CH
A.CH
A.CH
A.CH
4-channel
2-channel
2ch + woofer
2-channel
Tri-mode
40 A ´ 1 : KAC-849
30 A ´ 1 : KAC-749S
If you can’t find the specified capacity fuse at your
store etc., consult your Kenwood dealer.
terminals
• Stereo Connections:
• Bridged Connections:
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
CENTER
UNIT
UNIT
UNIT
MONO(Lch)
UNIT
When you wish to use the unit as a stereo
amplifier, stereo connections are used.
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.)
MONO(Lch)
MONO(Lch)
MONO(Lch)
MONO(Lch)
OPERATION
UNIT
OPERATION
OPERATION
OPERATION
OPERATION
NOTE
$
$
$
$
$
STEREO
STEREO
STEREO
STEREO
STEREO
B.CH
B.CH
B.CH
B.CH
B.CH
MONO(Lch)
MONO(Lch)
MONO(Lch)
MONO(Lch)
MONO(Lch)
...
F
R
INPUT SELECTOR
INPUT SELECTOR
INPUT SELECTOR
INPUT SELECTOR
INPUT SELECTOR
in case of 6dB/oct. slope
A
A
A
A
A
B
B
B
B
B
FUSE(40A)
R
R
R
R
R
R
R
R
L
L
L
L
L
L
L
L
1
L
R
L
R
A
A
A
A
A
%
%
%
%
%
A
B
A
B
A
B
A
B
A
B
2 3 4
BATT.
POWER IN
HPF
R
R
A.CH
L
L
OFF
LPF
FILTER
#
HPF
P.CON
B.CH
OFF
OUTPUT
C
C
C
C
SPEAKER
LPF
BASS BOOST(B.CH)
OFF
LEFT
80
80
80
100
100
100
L
L
BRIDGED
A
B
50
A
B
50
A
B
50
HPF
HPF
HPF
50
50
50
A.CH
FILTER FREQUENCY(Hz)
A.CH
FILTER FREQUENCY(Hz)
A.CH
FILTER FREQUENCY(Hz)
A.CH
A.CH
A.CH
OFF
OFF
OFF
5
4-channel
80
LPF
HPF
3-channel
80
LPF
HPF
2-channel
80
LPF
HPF
ON
BASS BOOST(B.CH)
R
R
LPF
R
R
LPF
R
R
LPF
L
L
L
L
L
L
150
150
150
200
200
200
200
200
200
@
OFF
FILTER
FILTER
FILTER
RIGHT
#
150
#
150
#
150
@
100
100
100
7
7
7
ON
High pass
Subwoofer
(L + R)
HPF
HPF
HPF
B.CH
B.CH
B.CH
OFF
100
80
OFF
100
80
OFF
100
80
50
50
50
50
50
50
C=
L=
LPF
LPF
LPF
A
B
B.CH
B.CH
B.CH
80
HPF
80
HPF
80
HPF
LPF
LPF
LPF
• If you wish to bridge-connect a speaker, the
• Be sure to connect capacitors to speakers to
• Ensure that the withstand voltage and
POWER AMPLIFIER
BASS BOOST(B.CH)
BASS BOOST(B.CH)
BASS BOOST(B.CH)
150
200
150
200
150
200
200
200
200
159000
speaker impedance must be no less than 4
ohms. Connecting a speaker with an
impedance lower than 4 ohms may damage
the unit.
which high frequencies will be passed.
Failure to do so will result in a drop of the
combined impedance with the subwoofer.
current ratings of the capacitors (C) and coils
(L) are sufficient.
159 x R
HPF
OFF
150
OFF
150
OFF
150
fc x R
A.CH
100
100
100
OFF
Front left speaker
Front right speaker
Rear left speaker
Rear right speaker
Left speaker
Left speaker
Right speaker
Right speaker
Subwoofer
7 FILTER FREQUENCY control
8 RCA cable ground lead terminal
9 Amplifier A/B LINE IN terminals
0 LINE OUT terminal
! Speaker level input terminals
@ BASS BOOST switch
2CAUTION
LPF
ON
ON
ON
fc
FILTER
adjusted independently regardless of the position
of the input selector switch.
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.
When the FILTER switch is set to the HPF (High-
Pass Filter) or LPF (Low-Pass Filter) position, the
threshold frequency can be adjusted with this
control.
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.
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.
When the switch is in “ON” position, the bass is
boosted by 6 dB.
The bass boost applies only to the B amplifier.
#
@
@
@
2CAUTION
NOTE
-3 dB
HPF
0 dB
(µF)
(mH)
B.CH
OFF
LPF
=
=
STEREO
A.CH
L
120Hz x 4½
159000
159 x 4½
MONO(Lch)
Crossover Frequency
OPERATION
120Hz
$
STEREO
Connection
B.CH
MONO(Lch)
NOTE
BASS BOOST(B.CH)
RCA cable connection
Speaker stereo connection
OFF
= 331.25 µF
= 5.3 mH
CENTER UNIT (Cassette receiver,
CD receiver, etc.)
8
(MIN)5
5
ON
3
2
4
INPUT SELECTOR
A
A.CH
Lead terminal*
Frequency
1
INPUT SENSITIVITY(V)
B
0.2(MAX)
%
L E
BRIDGED
B R
F T
0.5
L
0.3
ID G
HPF
A
6
A.CH
E D
OFF
LPF
(MIN)5
3
R IG
2
4
FILTER
C
B.CH
H T
For safe installation, read "Installation procedure" before starting work.
R
1
0.2(MAX)
0.5
0.3
HPF
B.CH
OFF
A
B
LPF
100
80
50
50
FILTER FREQUENCY(Hz)
HPF
A.CH
80
LPF
BASS BOOST(B.CH)
OFF
STEREO
150
200
200
(MIN)5
A.CH
150
ON
3
100
2
4
7
A.CH
MONO(Lch)
1
INPUT SENSITIVITY(V)
OPERATION
0.2(MAX)
100
80
50
0.5
0.3
50
HPF
B.CH
A.CH
OFF
80
LPF
HPF
FUSE(40A)
STEREO
LPF
(MIN)5
150
200
B.CH
200
3
2
4
150
100
FILTER
B.CH
MONO(Lch)
1
0.2(MAX)
Power wire connection
GND
8
4
Battery wire*
0.5
0.3
BATT.
INPUT SELECTOR
A
HPF
Protective Fuse*
B.CH
OFF
POWER IN
B
LPF
A
80
# FILTER switch
$ OPERATION switch
% INPUT SELECTOR switch
100
50
50
A.CH
FILTER FREQUENCY(Hz)
80
HPF
L
R
LPF
Power control wire*
STEREO
150
200
200
9
A.CH
150
This switch allows to apply high-pass or low-pass
filtering to the speaker outputs.
• HPF (High-Pass Filter) position:
• OFF position:
• LPF (Low-Pass Filter) position:
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:
• MONO (Lch) position:
This switch selects the input method of the signals
to be amplified by amplifiers A and B.
• A B position:
• A position:
100
A
A
MONO(Lch)
B
LINE IN
OPERATION
The filter outputs the band of higher frequencies
than the frequency set with the FILTER
FREQUENCY control.
The entire bandwidth is output without filtering.
The filter outputs the band of lower frequencies
than the frequency set with the FILTER
FREQUENCY control.
The speaker output is automatically turned
monaural (L+R).
The amplifier can be used as a stereo amplifier.
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.)
Amplifies both of the signals input to amplifiers A
and B.
80
100
P.CON
50
50
HPF
B.CH
80
LPF
STEREO
B
SPEAKER
OUTPUT
150
200
L
B.CH
200
L
0
150
100
MONO(Lch)
LINE OUT
GND
A
INPUT SELECTOR
+
A
B
B
LEFT
A
BRIDGED
SPEAKER LEVEL INPUT
L
R
!
L
FUSE(40A)
A
RIGHT
LINE IN
R
B
A
B
2
BATT.
RCA cable*
LINE OUT
A
POWER IN
A
B
A
+
A
B
B
3
POWER AMPLIFIER
SPEAKER LEVEL INPUT
Battery
R
R
L
L
R
4
P.CON
R
A
B
SPEAKER
OUTPUT
Power control wire*
L
R
LEFT
INPUT SENSITIVITY(V)
6
BRIDGED
(MIN)5
B
Terminal cover
3
2
4
Ground wire*
RIGHT
Lead terminal*
1
0.2(MAX)
A
B
Speaker level input connection
POWER AMPLIFIER
0.5
0.3
40
Cable Color of the
connector
A
B
Speaker bridge connection
5
25
15
10
(W)
Lead terminal*
BRIDGED
L E
F T
B R
L
L
R
L
R
ID G
E D
KAC-849
R IG
H T
R
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.
White
White/Black
Gray
Gray/Black
Green
Green/Black
Purple
Purple/Black
A
B
BASS BOOST(B.CH)
OFF
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
• When the internal temperature is high and unit
• When a ground wire of the center unit (cassette
(MIN)5
ON
3
2
4
ACC
Amplifies only signal input amplifier A with both
amplifiers A and B.
sent to the speaker output.
won’t operate.
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.
A.CH
INPUT SENSITIVITY(V)
1
0.2(MAX)
0.5
0.3
HPF
A.CH
Description of markings in the figure.
OFF
FUSE(40A)
LPF
A
A
B
B
(MIN)5
3
2
4
FILTER
B.CH
MAXIMUM POWER
R
1
F
*
0.2(MAX)
A
B
0.5
0.3
R
R
HPF
L
L
BATT.
B.CH
OFF
POWER IN
4/3/2 CHANNEL
LPF
80
100
AMPLIFIER
50
KAC-849
50
FILTER FREQUENCY(Hz)
A.CH
80
LPF
HPF
STEREO
150
Power indicator
200
200
Left
Front left
Front right
Right
Rear left
Rear right
Front
Rear
Commercially available
parts
A.CH
150
L
100
Car fuse box
MONO(Lch)
OPERATION
4
A
100
80
50
50
P.CON
B.CH
80
LPF
HPF
R
STEREO
150
B.CH
200
SPEAKER
OUTPUT
200
150
MONO(Lch)
100
GND
A
B
INPUT SELECTOR
A
B
L
LEFT
A
BRIDGED
Bridge
L
R
Bridge
B
R
A
LINE IN
RIGHT
Battery
B
Genuine-accessory
car stereo (No line
output center unit
etc.)
LINE OUT
A
+
A
B
B
4/3/2 CHANNEL AMPLIFIER
MAXIMUM POWER
SPEAKER LEVEL INPUT
POWER AMPLIFIER
KAC-749S
KAC-749S
L
R
A
B