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Car Audio / Passive Crossovers, 4 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

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

top of pageLow Pass, High Pass, Band Pass for 4 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 12.7 796 18 563 19.1 1058 6.37 530 9.5 1592
60 10.6 663 15 468 15.9 882 5.31 442 7.9 1326
70 9.1 568 12.8 401 13.6 756 4.54 379 6.8 1137
75 8.5 531 11.9 375 12.7 706 4.24 354 6.4 1061
80 7.9 497 11.3 352 12 662 3.97 331 5.9 995
85 7.5 468 10.6 331 11 623 3.74 312 5.6 936
100 6.3 398 9 281 9.6 529 3.18 265 4.8 796
120 5.3 331 7.5 234 7.9 441 2.65 221 3.9 663
125 5.1 318 7.2 225 7.6 423 2.55 212 3.8 637
150 4.2 265 6 188 6.4 353 2.12 177 3.2 531
200 3.18 199 4.5 141 4.8 265 1.59 133 2.4 398
250 2.55 159 3.6 113 3.8 212 1.27 106 1.9 318
275 2.32 145 3.27 102 3.5 192 1.12 97 1.7 289
300 2.12 133 3 94 3.2 176 1.06 89 1.6 265
400 1.59 99 2.25 70 2.4 132 0.79 66 1.2 199
500 1.27 80 1.8 56 1.9 106 0.64 53 0.95 159
600 1.06 66 1.5 47 1.6 88 0.53 44 0.79 133
800 0.79 50 1.13 35 1.2 66 0.39 33 0.59 99
1000 0.64 40 0.9 28 0.95 53 0.32 27 0.48 80
2000 0.32 20 0.45 14 0.48 26 0.16 13 0.24 40
2500 0.25 16 0.36 11 0.38 21 0.13 11 0.19 32
3000 0.21 13 0.3 9.4 0.32 18 0.11 8.8 0.16 27
3500 0.18 11 0.26 8 0.27 15 0.09 7.6 0.14 23
4000 0.16 9.9 0.23 7 0.24 13 0.08 6.6 0.12 20
5000 0.13 8 0.18 5.6 0.19 11 0.06 5.3 0.1 16
6000 0.11 6.6 0.15 4.7 0.16 8.8 0.05 4.4 0.08 13
7000 0.09 5.7 0.13 4 0.14 7.6 0.05 3.8 0.07 11
8000 0.08 4.9 0.11 3.5 0.12 6.6 0.04 3.3 0.06 9.9
9000 0.07 4.4 0.1 3.1 0.11 5.9 0.04 2.9 0.05 8.8
10000 0.06 4 0.09 2.8 0.1 5.3 0.03 2.7 0.05 7.9
Capacitor (C) values = microfarads (fd) Coil (L) values = millihenries (mHy)
top of pageNarrow Band Pass for 4 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 4.24 239 5.4 188 6 169 6.32 160 2.84 356 2.12 478
100 - 300 3.18 265 6 141 4.5 188 4.74 178 3.16 267 1.59 531
100 - 400 2.12 298 6.75 94 3 211 3.16 199 3.55 178 1.06 597
100 - 500 1.59 318 7.2 70 2.25 225 2.37 214 3.79 133 0.79 637
60 - 200 4.55 464 10.5 201 6.43 328 6.77 312 5.53 382 2.27 929
60 - 300 2.65 530 12 117 3.75 375 3.95 356 6.34 223 1.33 1061
70 - 200 4.9 370 8.36 216 6.93 261 7.29 248 4.39 411 2.45 739
70 - 300 2.77 436 9.86 122 3.92 308 4.12 293 5.19 232 1.38 872
70 - 400 1.93 468 10.6 85 2.73 331 2.87 315 5.58 162 0.96 938
80 - 200 5.31 298 6.75 234 7.5 211 7.89 200 3.55 446 2.65 597
80 - 300 2.89 365 8.26 128 4.09 258 4.31 245 4.34 243 1.5 730
80 - 400 1.99 398 9.01 88 2.81 281 2.96 267 4.74 167 0.99 796
85 - 200 5.56 269 6.09 245 7.83 190 8.24 181 3.21 468 2.77 538
85 - 300 2.96 336 7.59 131 4.2 237 4.41 225 3.99 249 1.48 671
85 - 400 2.1 369 8.34 89 2.86 261 3.01 248 4.39 170 1.01 737
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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