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 µfd capacitor, you can parallel two 35 µfd 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 Low Pass, High Pass, Band Pass Reference Chart

Low 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 (µfd) Coil (L) values = millihenries (mHy)

4 Ohm Narrow Band Pass Reference Chart

Narrow 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 (µfd) Coil (L) values = millihenries (mHy)

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