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13
System examples
L
L
L
R
L
R
L
R
L
R
L
R
LINE
OUT
A
B
C
C
25Hz
15Hz
INFRASONIC
FILTEROPERATION
OFF
0.2
0.5
5
1
2
3
4
(MAX)(MIN)
25Hz
15Hz
INFRASONIC
FREQ (Hz)
FREQ (Hz)
OFF
LPF
OFF
HPF
MONO
STEREO
FILTER
LPF
OFF
HPF
OPERATION
MONO
STEREO
INPUT SELECT
A
AB
CONTROL
INPUT SENSITIVITY(V)
0.2
0.5
5
1
2
3
4
(MAX)(MIN)
INPUT SENSITIVITY(V)
A
CONTROL
B
LO PASS
50 50200 200
HI PASS
LO PASS
50 50200 200
HI PASS
FILTER
FREQUENCY
A
B
B.M.S.
B.M.S.
FREQ(Hz)
B.M.S.
(
+
6)
CLOSE
OPEN/ B.M.S.
(REMOTE)
10050
80
■
Tri-mode
CENTRE UNIT
(High pass)
Subwoofer
(L + R) (Bridged)
●
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.
• 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.
2CAUTION
L
R
L
R
L
R
LINE
OUT
A
B
BRIDGEDBRIDGED
L
R
25Hz
15Hz
INFRASONIC
FILTEROPERATION
OFF
0.2
0.5
5
1
2
3
4
(MAX)(MIN)
25Hz
15Hz
INFRASONIC
FREQ (Hz)
FREQ (Hz)
OFF
LPF
OFF
HPF
MONO
STEREO
FILTER
LPF
OFF
HPF
OPERATION
MONO
STEREO
INPUT SELECT
A
AB
CONTROL
INPUT SENSITIVITY(V)
0.2
0.5
5
1
2
3
4
(MAX)(MIN)
INPUT SENSITIVITY(V)
A
CONTROL
B
LO PASS
50 50200 200
HI PASS
LO PASS
50 50200 200
HI PASS
FILTER
FREQUENCY
A
B
B.M.S.
B.M.S.
FREQ(Hz)
B.M.S.
(
+
6)
CLOSE
OPEN/ B.M.S.
(REMOTE)
10050
80
■
High-power 2-channel system
CENTRE UNIT
Left
speaker
Right
speaker
Switch setting
Switch setting