參數(shù)資料
型號(hào)： KAC-749S
廠商： Electronic Theatre Controls, Inc.
英文描述： 4-Channel power amplifier
中文描述： 4通道功率放大器
文件頁數(shù)： 2/2頁
文件大?。?/td> 373K
代理商： KAC-749S
System examples
L
R
L
R
A
B
A
B
L
R
L
R
A
B
L
R
L
R
A
B
L
R
L
R
A
B
L
R
L
R
A
B
L
R
L
R
A
B
L
R
L
R
ON
OFF
BASS BOOST(B.CH)
LPF
HPF
OFF
A.CH
FILTER
LPF
HPF
OFF
B.CH
ON
OFF
BASS BOOST(B.CH)
LPF
HPF
OFF
A.CH
FILTER
LPF
HPF
OFF
B.CH
ON
OFF
BASS BOOST(B.CH)
LPF
HPF
OFF
A.CH
FILTER
LPF
HPF
OFF
B.CH
OPERATION
INPUT SELECTOR
MONO(Lch)
STEREO
A.CH
MONO(Lch)
STEREO
B.CH
A
A
B
7
#
%
OPERATION
$
INPUT SELECTOR
MONO(Lch)
STEREO
A.CH
MONO(Lch)
STEREO
B.CH
A
A
B
%
OPERATION
INPUT SELECTOR
MONO(Lch)
STEREO
A.CH
MONO(Lch)
STEREO
B.CH
A
A
B
%
OPERATION
F
R
INPUT SELECTOR
MONO(Lch)
STEREO
A.CH
MONO(Lch)
STEREO
B.CH
A
A
B
%
@
7
#
@
7
#
@
200
200
50
50
LPF
HPF
FILTER FREQUENCY(Hz)
150
80
150
100
80
100
200
200
50
50
LPF
HPF
150
80
150
100
80
100
200
200
50
50
LPF
HPF
FILTER FREQUENCY(Hz)
150
80
150
100
80
100
200
200
50
50
LPF
HPF
150
80
150
100
80
100
200
200
50
50
LPF
HPF
FILTER FREQUENCY(Hz)
150
80
150
100
80
100
200
200
50
50
LPF
HPF
150
80
150
100
80
100
4
LEFT
BRIDGED
SPEAKER
OUTPUT
POWER IN
P.CON
BATT.
FUSE(40A)
RIGHT
A
B
POWER AMPLIFIER
GND
4
3
2
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
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 using an RCA cable with a ground lead
Do not use this terminal for power source
adjusted independently regardless of the position
source grounding wire is connected to this
terminal.
9
Amplifier A/B LINE IN terminals
0
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.
!
Speaker level input terminals
@
BASS BOOST switch
When the switch is in “ON” position, the bass is
boosted by 6 dB.
The bass boost applies only to the B amplifier.
The amplification methods of the signals input to
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 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:
Terminal cover
Battery
Ground wire*
Battery wire*
Protective Fuse*
Power control wire*
I
Power wire connection
L
C
C
L
C
C
ON
OFF
BASS BOOST(B.CH)
LPF
HPF
OFF
A.CH
FILTER
LPF
HPF
OFF
B.CH
OPERATION
INPUT SELECTOR
MONO(Lch)
STEREO
A.CH
MONO(Lch)
STEREO
B.CH
A
A
B
%
#
@
L
R
L
R
L
R
L
R
A
B
Connection
For safe installation, read "Installation procedure" before starting work.
I
RCA cable connection
NOTE
4
LEFT
BRIDGED
SPEAKER
OUTPUT
POWER IN
P.CON
BATT.
FUSE(40A)
RIGHT
A
B
POWER AMPLIFIER
ON
OFF
BASS BOOST(B.CH)
LPF
HPF
OFF
A.CH
A.CH
INPUT SENSITIVITY(V)
FILTER
OPERATION
INPUT SELECTOR
A
A
B
LINE IN
LINE OUT
A
+
SPEAKER LEVEL INPUT
MONO(Lch)
STEREO
A.CH
MONO(Lch)
STEREO
B.CH
LPF
HPF
OFF
B.CH
B.CH
0.2(MAX)
(MIN)5
0.3
0.5
1
2
3
4
0.2(MAX)
(MIN)5
0.3
0.5
1
2
3
4
GND
A
L
R
B
B
A
B
L
R
L
A
L
A
R
B
R
L
R
A
R
B
A
B
L
B
200
200
50
50
LPF
HPF
A.CH
FILTER FREQUENCY(Hz)
150
80
150
100
80
B.CH
100
200
200
50
50
LPF
HPF
150
80
150
100
80
100
GND
GND
4
4
LEFT
BRIDGED
RIGHT
A
B
BRIDGED
R
L
8
5
5
GND
CENTER UNIT
(Cassette receiver,
CD receiver, etc.)
Power control wire*
RCA cable*
Lead terminal*
I
4-channel
I
4-channel
I
3-channel
I
2-channel
I
2ch + woofer
I
2-channel
I
Speaker level input connection
I
Speaker stereo connection
I
Speaker bridge connection
CENTER
UNIT
CENTER
UNIT
CENTER
UNIT
I
2-channel
CENTER
UNIT
I
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 (
)
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.
2
CAUTION
L
C
0 dB
-3 dB
Crossover Frequency
Frequency
CENTER
UNIT
High pass
Subwoofer
(L + R)
C= fc x R
L= 15fc
= 120Hz x 4
= 1120Hz
Front left speaker
Front right speaker
Rear left speaker
Rear right speaker
Left speaker
Right speaker
Left speaker
Right speaker
Subwoofer
Lead terminal*
Cable Color of the
connector
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