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Setting the Filter Constant
Low-pass filter (for subwoofer/woofer):
6 dB/octave
L1
High-pass filter (for mid/mid-high):
6 dB/octave
C1
Component Guide
Speaker load Impedance
fc (Hz)
50
80
125
200
320
500
800
1,250
2,000
3,200
5,000
8,000
10,000
0dB
–6dB
f
f
2f
C
C
0dB
–6dB
f
f
f
C
C
2
L (mH)
6.4
4.0
2.5
1.6
1.0
0.64
0.4
0.25
0.16
0.1
0.06
0.04
0.03
Band-pass filter (combination of low-pass
filter and high-pass filter for mid-
bass/mid): 6 dB/octave
L2
C2
• A multi-channel system can be set up using a
combination of filters. The inductance (L) and
capacitance (C) will determine the frequency (fc)
that the speaker will reproduce. Refer to the chart
below to determine the components required.
• Use the capacitors specified. Non-polarized
capacitors rated at over ±25 V should be used for
C1 and C2 in the diagram. Because of the voltage
output of the amplifier, it is very important to use
non-polarized capacitors rated at or over 25 V.
This will prevent a safety hazard.
2 Ω
4 Ω
C (µF)
L (mH)
1,600
12.70
1,000
8.00
640
5.10
400
3.20
250
2.00
160
1.30
100
0.80
64
0.50
40
0.30
25
0.20
16
0.13
10
0.08
8
0.06
f
f
f
CL
CL
CH
2
8 Ω
C (µF)
L (mH)
C (µF)
800.0
25.50
500.0
16.00
300.0
10.00
200.0
6.40
125.0
4.00
80.0
2.60
50.0
1.60
30.0
1.00
20.0
0.64
12.5
0.40
8.0
0.26
5.0
0.16
4.0
0.13
0dB
–6dB
2f
CH
400.0
250.0
160.0
100.0
62.0
40.0
25.0
16.0
10.0
6.2
4.0
2.5
2.0