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Kenwood KAC-746 User Manual Page 8

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8
System examples
●
Principle of Tri-mode
Method of frequency band division using a coil and capacitor•••in case of 6dB/oct. slope
L
C
0 dB
-3 dB
Coil (L):
Passes low frequencies and blocks high
frequencies. (Low pass)
Capacitor (C):
Passes high frequencies and blocks low
frequencies. (High pass)
Crossover Frequency
Frequency
159000
C= (µF)
fc x R
159 x R
L= (mH)
fc
fc=Cut of Frequency (Hz)
R=Speaker Impedance (Ω)
●
Example:
When it is required to set a crossover frequency of 120 Hz using speakers with an
impedance of 4 ohms.
Prepare commercially-available coil and capacitor with the closest ratings to the results
calculated from the formula above. The capacitor rating should be as close as possible to
331.25 (µF) and the coil rating should be as close as possible to 5.3 (mH).
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.
2CAUTION
A+B
LINE OUT
L
R
L
R
L
R
A
B
L
R
L
R
A+B
LINE OUT
L
R
L
R
L
R
A
B
L
R
L
R
A+B
LINE OUT
L
R
L
R
L
R
A
B
L
R
L
R
A+B
LINE OUT
L
R
L
R
L
R
A
B
L
R
L
R
CONTROL
INPUT SELECTOR
A
AA B
FREQUENCY(Hz)
LPF
OFF
FILTER
HPF
20050
200
150
100
HPF
LPF
50
80
80
100
150
OPERATION
MONO(Lch)STEREO
L
+
R
CONTROL
FREQUENCY(Hz)
OPERATION
B
LPF
OFF
FILTER
HPF
MONO(Lch)
20050
STEREO
L
+
R
200
150
100
HPF
LPF
50
80
80
100
150
CONTROL
INPUT SELECTOR
A
AA B
FREQUENCY(Hz)
LPF
OFF
FILTER
HPF
20050
200
150
100
HPF
LPF
50
80
80
100
150
OPERATION
MONO(Lch)STEREO
L
+
R
CONTROL
FREQUENCY(Hz)
OPERATION
B
LPF
OFF
FILTER
HPF
MONO(Lch)
20050
STEREO
L
+
R
200
150
100
HPF
LPF
50
80
80
100
150
CONTROL
INPUT SELECTOR
A
AA B
FREQUENCY(Hz)
LPF
OFF
FILTER
HPF
20050
200
150
100
HPF
LPF
50
80
80
100
150
OPERATION
MONO(Lch)STEREO
L
+
R
CONTROL
FREQUENCY(Hz)
OPERATION
B
LPF
OFF
FILTER
HPF
MONO(Lch)
20050
STEREO
L
+
R
200
150
100
HPF
LPF
50
80
80
100
150
CONTROL
INPUT SELECTOR
A
AA B
FREQUENCY(Hz)
LPF
OFF
FILTER
HPF
20050
200
150
100
HPF
LPF
50
80
80
100
150
OPERATION
MONO(Lch)STEREO
L
+
R
CONTROL
FREQUENCY(Hz)
OPERATION
B
LPF
OFF
FILTER
HPF
MONO(Lch)
20050
STEREO
L
+
R
200
150
100
HPF
LPF
50
80
80
100
150
L
L
C
C
C
C
CENTER UNIT
CENTER UNIT
CENTER UNIT
CENTER UNIT
(High pass)
Subwoofer
(L + R)
(Bridged)
(Bridged)
(Bridged)
■
Full-range 4-channel + Subwoofer system
■
High-pass (80 Hz) + Subwoofer(80 Hz) system
■
Tri-mode
■
High-power 2-channel system
Switch setting
Switch setting
Switch setting
Switch setting
Amplifier
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