8 Ohm Impedance Passive Crossover Chart

If you need a 16 mHy coil, you can series a 12.8 mHy coil and a 3.2 mHy coil. If you need a 70 ľfd capacitor, you can parallel two 35 ľfd capacitors.When the exact value of a coil or capacitor is not available, you can substitute values of ± 5% . To get the needed values for desired crossover frequencies not listed, use these formulas & calculators.

High Pass, Low Pass, Band Pass

Narrow Band Pass

Low Pass, High Pass, Band Pass for 8 Ohm Load

Capacitor (C) values = microfarads (ľfd)
Coil (L) values = millihenries (mHy)

Crossover
Frequency

1^st Order
6 dB

2^nd Order
12 dB

3^rd Order
18 dB

(Hz)

50
60
70
75
80
85
100
120
125
150
200
250
275
300
400
500
600
800
1000
2000
2500
3000
3500
4000
5000
6000
7000
8000
9000
10,000

25.5
21.2
18.2
16.9
15.9
14.9
12.7
10.6
10.2
8.4
6.4
5.1
4.6
4.2
3.2
2.5
2.1
1.6
1.3
.64
.51
.42
.36
.32
.25
.21
.18
.16
.14
.13

398
331
284
265
249
234
199
166
159
133
99
80
72
66
50
40
33
25
20
9.9
7.9
6.6
5.7
4.9
3.9
3.3
2.8
2.5
2.2
2.0

36.0
30.0
25.7
24.0
22.5
21.2
18.0
15.0
14.4
12.0
9.0
7.2
6.5
6.0
4.5
3.6
3.0
2.3
1.8
.9
.72
.6
.51
.45
.36
.3
.26
.23
.2
.18

281
234
200
188
176
165
141
117
113
94
70
56
51
47
35
28
23
18
14
7.0
5.6
4.7
4.0
3.5
2.8
2.3
2.0
1.8
1.6
1.4

38.2
31.8
27.3
25.5
23.9
22.5
19.1
15.9
15.3
12.7
9.6
7.6
6.9
6.4
4.8
3.8
3.2
2.4
1.9
.95
.76
.64
.55
.48
.38
.32
.27
.24
.21
.19

529
441
378
353
331
311
265
221
212
176
132
106
96
88
66
53
44
33
26
13
11
8.8
7.6
6.6
5.3
4.4
3.8
3.3
2.9
2.6

12.7
10.6
9.1
8.5
7.9
7.5
6.4
5.3
5.1
4.2
3.2
2.5
2.3
2.1
1.6
1.3
1.1
.79
.64
.32
.25
.21
.18
.16
.13
.11
.09
.08
.07
.06

265
221
190
177
166
156
133
111
106
89
66
53
48
44
33
27
22
17
13
6.6
5.3
4.4
3.8
3.3
2.7
2.2
1.9
1.7
1.5
1.3

19.1
15.9
13.6
12.7
11.9
11.2
9.6
7.9
7.6
6.4
4.8
3.8
3.5
3.2
2.4
1.9
1.59
1.2
.95
.48
.38
.32
.27
.24
.19
.16
.14
.12
.11
.09

796
663
568
530
497
468
398
332
318
265
199
159
145
133
99
80
66
50
40
20
16
13
11
9.9
7.9
6.6
5.7
4.9
4.4
3.9

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Narrow Band Pass for 8 Ohm Load - Mid-Bass Loudspeakers

Capacitor (C) values = microfarads (ľfd)
Coil (L) values = millihenries (mHy)

Frequency
Bandwidth

1^st Order
6 dB

2^nd Order
12 dB

3^rd Order
18 dB

(Hz)

60 - 200
60 - 300
70 - 200
70 - 300
70 - 400
80 - 200
80 - 300
80 - 400
85 - 200
85 - 300
85 - 400
100 - 250
100 - 300
100 - 400
100 - 500

232
265
185
218
235
149
182
199
135
168
184
119
133
149
159

9.09
5.31
9.79
5.54
3.86
10.6
5.79
3.98
11.07
5.92
4.04
8.4
6.4
4.2
3.2

100
59
108
61
43
117
64
44
122
65
45
94
70
47
35

21.01
24.02
16.72
19.73
21.23
13.51
16.51
18.01
12.18
15.19
16.69
10.6
12.0
13.5
14.4

164
188
131
154
166
106
129
141
95
118
130
84
94
106
113

12.86
7.50
13.85
7.83
5.5
15.0
8.4
5.6
15.7
8.37
5.72
12.0
9.0
6.0
4.5

156
178
124
146
158
100
123
133
90
113
124
80
89
99
107

13.5
7.9
14.6
8.2
5.7
15.8
8.6
5.9
16.5
8.8
6.0
12.8
9.5
6.4
4.5

191
111
199
116
81
223
122
84
232
124
85
178
133
89
66

11.1
12.6
8.79
10.4
11.2
7.1
8.7
9.48
6.4
7.99
8.4
5.6
6.4
7.2
7.5

464
531
370
436
469
298
365
398
269
336
369
234
265
298
318

4.55
2.65
4.89
2.8
1.9
5.3
2.9
1.9
5.5
3.0
2.1
4.2
3.2
2.1
1.6

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Passive Crossovers 8 Ohm Load Charts

Passive Crossovers
8 Ohm Load Charts