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.

High Pass, Low Pass, Band Pass

Narrow Band Pass

Low Pass, High Pass, Band Pass for 2 Ohm Load
Capacitor (C) values = microfarads (µfd) Coil (L) values = millihenries (mHy)
Crossover Frequency		1st Order 6 dB			2nd Order 12 dB			3rd Order 18 dB
(Hz)		L1	C1		L2	C2		L3	C3	L4	C4	L5	C5
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		6.37 5.31 4.55 4.24 3.98 3.74 3.18 2.65 2.55 2.12 1.59 1.27 1.16 1.06 .80 .64 .53 .40 .32 .16 .13 .11 .09 .08 .06 .05 .05 .04 .04 .03	1592 1326 1137 1061 995 936 796 663 637 531 398 318 289 265 199 159 133 99 80 40 32 27 23 20 16 13 11 9.9 8.8 8.0		9.0 7.5 6.4 6.0 5.63 5.30 4.50 3.75 3.60 3.00 2.25 1.80 1.64 1.50 1.13 .90 .75 .56 .45 .23 .18 .15 .13 .11 .09 .08 .06 .06 .05 .05	1125 938 804 750 703 662 563 469 450 375 281 225 205 188 141 113 94 70 56 28 23 19 16 14 11 9.4 8.0 7.0 6.3 5.6		9.55 7.96 6.82 6.37 5.97 5.62 4.77 3.98 3.82 3.18 2.39 1.91 1.74 1.59 1.19 .95 .80 .60 .48 .24 .19 .16 .14 .12 .10 .08 .07 .06 .05 .05	2117 1764 1512 1411 1323 1245 1058 882 847 706 529 423 385 353 265 212 176 132 106 53 42 35 30 27 21 18 15 13 12 11	3.18 2.65 2.27 2.12 1.99 1.87 1.59 1.33 1.27 1.06 .80 .64 .58 .53 .40 .32 .27 .20 .16 .08 .06 .05 .05 .04 .03 .03 .02 .02 .02 .02	1062 885 758 708 663 624 531 442 425 354 265 212 193 177 133 106 88 66 53 27 21 18 15 13 11 8.8 7.6 6.6 5.9 5.3	4.77 3.98 3.41 3.18 2.98 2.81 2.39 1.99 1.91 1.59 1.19 .95 .87 .80 .60 .48 .40 .30 .24 .12 .10 .08 .07 .06 .05 .04 .03 .03 .03 .02	3183 2653 2274 2122 1989 1872 1592 1326 1273 1061 796 637 579 531 398 318 265 199 159 80 64 53 46 40 32 27 23 20 18 16
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Narrow Band Pass for 2 Ohm Load - Mid-Bass Loudspeakers
Capacitor (C) values = microfarads (µfd) Coil (L) values = millihenries (mHy)
Frequency Bandwidth		1st Order 6 dB			2nd Order 12 dB					3rd Order 18 dB
(Hz)		C1	L1		C1	L1	C2	L2		C1	L1	C2	L2	C3	L3
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		929 1061 739 872 938 597 730 796 538 671 737 478 531 597 637	2.27 1.33 2.50 1.38 .96 2.65 1.50 .99 2.77 1.50 1.06 2.10 1.59 1.06 .80		402 234 433 245 170 469 256 176 489 265 521 375 281 188 141	5.25 6.00 4.20 5.10 5.30 3.38 4.20 4.50 3.00 3.80 1.43 2.70 3.00 3.38 3.60	656 750 523 616 663 422 516 563 381 474 179 338 375 422 450	3.22 1.88 3.46 1.96 1.36 3.75 2.10 1.41 3.92 2.10 4.20 3.00 2.25 1.50 1.13		624 713 496 585 630 398 490 535 362 451 495 321 356 401 428	3.39 1.97 3.60 2.10 1.50 3.95 2.10 1.50 4.20 2.20 1.50 3.20 2.37 1.50 1.13	764 446 823 468 324 891 486 334 930 497 339 713 535 356 265	2.76 3.16 2.20 2.50 2.79 1.80 2.10 2.37 1.59 2.10 2.10 1.42 1.59 1.80 1.90	1857 2122 1478 1743 1876 1194 1459 1592 1077 1342 1475 955 1061 1194 1273	1.14 0.66 1.27 0.69 0.48 1.33 0.72 0.50 1.38 0.74 0.51 1.06 0.80 0.53 0.40
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Passive Crossovers		Car Audio
First Order Filters Second Order Filters Third Order Filters Formulas & Calculators	2 Ohm Charts 4 Ohm Charts 8 Ohm Charts	Glossary Installs Ohm's Law Passive Crossovers Power and Ground Cable Sizes Subwoofer Enclosures the12volt's Install Bay Tools & Equipment