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Car Audio / Passive Crossovers, 8 Ohm Reference Charts

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 fd capacitor, you can parallel two 35 fd 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

8 Ohm Reference Charts:
High Pass, Low Pass, Band Pass
Narrow Band Pass

top of pageLow Pass, High Pass, Band Pass for 8 Ohm Load
Crossover Frequency 1st Order 6dB 2nd Order 12db 3rd Order 18dB
Hz L1 C1 L2 C2 L3 C3 L4 C4 L5 C5
50 25.5 398 36 281 38.2 529 12.7 265 19.1 796
60 21.2 331 30 234 31.8 441 10.6 221 15.9 663
70 18.2 284 25.7 200 27.3 378 9.1 190 13.6 568
75 16.9 265 24 188 25.5 353 8.5 177 12.7 530
80 15.9 249 22.5 176 23.9 331 7.9 166 11.9 497
85 14.9 234 21.2 165 22.5 311 7.5 156 11.2 468
100 12.7 199 18 141 19.1 265 6.4 133 9.6 398
120 10.6 166 15 117 15.9 221 5.3 111 7.9 332
125 10.2 159 14.4 113 15.3 212 5.1 106 7.6 318
150 8.4 133 12 94 12.7 176 4.2 89 6.4 265
200 6.4 99 9 70 9.6 132 3.2 66 4.8 199
250 5.1 80 7.2 56 7.6 106 2.5 53 3.8 159
275 4.6 72 6.5 51 6.9 96 2.3 48 3.5 145
300 4.2 66 6 47 6.4 88 2.1 44 3.2 133
400 3.2 50 4.5 35 4.8 66 1.6 33 2.4 99
500 2.5 40 3.6 28 3.8 53 1.3 27 1.9 80
600 2.1 33 3 23 3.2 44 1.1 22 1.59 66
800 1.6 25 2.3 18 2.4 33 0.79 17 1.2 50
1000 1.3 20 1.8 14 1.9 26 0.64 13 0.95 40
2000 0.64 9.9 0.9 7 0.95 13 0.32 6.6 0.48 20
2500 0.51 7.9 0.72 5.6 0.76 11 0.25 5.3 0.38 16
3000 0.42 6.6 0.6 4.7 0.64 8.8 0.21 4.4 0.32 13
3500 0.36 5.7 0.51 4 0.55 7.6 0.18 3.8 0.27 11
4000 0.32 4.9 0.45 3.5 0.48 6.6 0.16 3.3 0.24 9.9
5000 0.25 3.9 0.36 2.8 0.38 5.3 0.13 2.7 0.19 7.9
6000 0.21 3.3 0.3 2.3 0.32 4.4 0.11 2.2 0.16 6.6
7000 0.18 2.8 0.26 2 0.27 3.8 0.09 1.9 0.14 5.7
8000 0.16 2.5 0.23 1.8 0.24 3.3 0.08 1.7 0.12 4.9
9000 0.14 2.2 0.2 1.6 0.21 2.9 0.07 1.5 0.11 4.4
10000 0.13 2 0.18 1.4 0.19 2.6 0.06 1.3 0.09 3.9
Capacitor (C) values = microfarads (fd) Coil (L) values = millihenries (mHy)
top of pageNarrow Band Pass for 8 Ohm Load - Mid-Bass Loudspeakers
Crossover Frequency 1st Order 6dB 2nd Order 12dB 3rd Order 18dB
Hz _L1_ _C1_ _L2_ _C2_ _L3_ _C3_ _L4_ _C4_ _L5_ _C5_ _L6_ _C6_
100 - 250 8.4 119 10.6 94 12 84 12.8 80 5.6 178 4.2 234
100 - 300 6.4 133 12 70 9 94 9.5 89 6.4 133 3.2 265
100 - 400 4.2 149 13.5 47 6 106 6.4 99 7.2 89 2.1 298
100 - 500 3.2 159 14.4 35 4.5 113 4.5 107 7.5 66 1.6 318
60 - 200 9.09 232 21.01 100 12.86 164 13.5 156 11.1 191 4.55 464
60 - 300 5.31 265 24.02 59 7.5 188 7.9 178 12.6 111 2.65 531
70 - 200 9.79 185 16.72 108 13.85 131 14.6 124 8.79 199 4.89 370
70 - 300 5.54 218 19.73 61 7.83 154 8.2 146 10.4 116 2.8 436
70 - 400 3.86 235 21.23 43 5.5 166 5.7 158 11.2 81 1.9 469
80 - 200 10.6 149 13.51 117 15 106 15.8 100 7.1 223 5.3 298
80 - 300 5.79 182 16.51 64 8.4 129 8.6 123 8.7 122 2.9 365
80 - 400 3.98 199 18.01 44 5.6 141 5.9 133 9.48 84 1.9 398
85 - 200 11.07 135 12.18 122 15.7 95 16.5 90 6.4 232 5.5 269
85 - 300 5.92 168 15.19 65 8.37 118 8.8 113 7.99 124 3 336
85 - 400 4.04 184 16.69 45 5.72 130 6 124 8.4 85 2.1 369
Capacitor (C) values = microfarads (fd) Coil (L) values = millihenries (mHy)
Passive Crossovers:
Low Pass Filters
High Pass Filters
Band Pass Filters
Narrow Band Pass Filters
Zobel Filter
Acoustical Output & Power
First Order Filters
Second Order Filters
Third Order Filters
Formulas & Calculators
2 Ohm Reference Charts
4 Ohm Reference Charts
8 Ohm Reference Charts
Car Audio and Mobile Video:
Glossary of Terms
Passive Crossovers
Passive Crossover Calculators
Recommended Wire Sizes
Subwoofer Enclosures
Subwoofer Enclosure Calculators
Thiele - Small Parameters
Help and Additional Resources:
American Wire Gauge Sizes
Application Guides
Car Audio Forum
Car Audio Hot Topics
Car Stereo Insurance
Car Audio Manuals
Mobile Video & Navigation Forum


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