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Passive Crossovers
4 Ohm Load 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.

  • High Pass, Low Pass, Band Pass
  • Narrow Band Pass



  • Low Pass, High Pass, Band Pass for 4 Ohm Load line
    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
    12.7
    10.6
    9.1
    8.5
    7.9
    7.5
    6.3
    5.3
    5.1
    4.2
    3.18
    2.55
    2.32
    2.12
    1.59
    1.27
    1.06
    .79
    .64
    .32
    .25
    .21
    .18
    .16
    .13
    .11
    .09
    .08
    .07
    .06
    796
    663
    568
    531
    497
    468
    398
    331
    318
    265
    199
    159
    145
    133
    99
    80
    66
    50
    40
    20
    16
    13
    11
    9.9
    8.0
    6.6
    5.7
    4.9
    4.4
    4.0
    18.0
    15.0
    12.8
    11.9
    11.3
    10.6
    9.0
    7.5
    7.2
    6.0
    4.5
    3.6
    3.27
    3.00
    2.25
    1.80
    1.50
    1.13
    .90
    .45
    .36
    .30
    .26
    .23
    .18
    .15
    .13
    .11
    .10
    .09
    563
    468
    401
    375
    352
    331
    281
    234
    225
    188
    141
    113
    102
    94
    70
    56
    47
    35
    28
    14
    11
    9.4
    8.0
    7.0
    5.6
    4.7
    4.0
    3.5
    3.1
    2.8
    19.1
    15.9
    13.6
    12.7
    12.0
    11.0
    9.6
    7.9
    7.6
    6.4
    4.8
    3.8
    3.5
    3.2
    2.4
    1.9
    1.6
    1.2
    .95
    .48
    .38
    .32
    .27
    .24
    .19
    .16
    .14
    .12
    .11
    .10
    1058
    882
    756
    706
    662
    623
    529
    441
    423
    353
    265
    212
    192
    176
    132
    106
    88
    66
    53
    26
    21
    18
    15
    13
    11
    8.8
    7.6
    6.6
    5.9
    5.3
    6.37
    5.31
    4.54
    4.24
    3.97
    3.74
    3.18
    2.65
    2.55
    2.12
    1.59
    1.27
    1.12
    1.06
    .79
    .64
    .53
    .39
    .32
    .16
    .13
    .11
    .09
    .08
    .06
    .05
    .05
    .04
    .04
    .03
    530
    442
    379
    354
    331
    312
    265
    221
    212
    177
    133
    106
    97
    89
    66
    53
    44
    33
    27
    13
    11
    8.8
    7.6
    6.6
    5.3
    4.4
    3.8
    3.3
    2.9
    2.7
    9.5
    7.9
    6.8
    6.4
    5.9
    5.6
    4.8
    3.9
    3.8
    3.2
    2.4
    1.9
    1.7
    1.6
    1.2
    .95
    .79
    .59
    .48
    .24
    .19
    .16
    .14
    .12
    .10
    .08
    .07
    .06
    .05
    .05
    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
    7.9
    top




    Narrow Band Pass for 4 Ohm Load - Mid-Bass Loudspeakers line
    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
    464
    530
    370
    436
    468
    298
    365
    398
    269
    336
    369
    239
    265
    298
    318
    4.55
    2.65
    4.90
    2.77
    1.93
    5.31
    2.89
    1.99
    5.56
    2.96
    2.10
    4.24
    3.18
    2.12
    1.59
    201
    117
    216
    122
    85
    234
    128
    88
    245
    131
    89
    188
    141
    94
    70
    10.5
    12.0
    8.36
    9.86
    10.6
    6.75
    8.26
    9.01
    6.09
    7.59
    8.34
    5.40
    6.00
    6.75
    7.20
    328
    375
    261
    308
    331
    211
    258
    281
    190
    237
    261
    169
    188
    211
    225
    6.43
    3.75
    6.93
    3.92
    2.73
    7.50
    4.09
    2.81
    7.83
    4.20
    2.86
    6.00
    4.50
    3.00
    2.25
    312
    356
    248
    293
    315
    200
    245
    267
    181
    225
    248
    160
    178
    199
    214
    6.77
    3.95
    7.29
    4.12
    2.87
    7.89
    4.31
    2.96
    8.24
    4.41
    3.01
    6.32
    4.74
    3.16
    2.37
    382
    223
    411
    232
    162
    446
    243
    167
    468
    249
    170
    356
    267
    178
    133
    5.53
    6.34
    4.39
    5.19
    5.58
    3.55
    4.34
    4.74
    3.21
    3.99
    4.39
    2.84
    3.16
    3.55
    3.79
    929
    1061
    739
    872
    938
    597
    730
    796
    538
    671
    737
    478
    531
    597
    637
    2.27
    1.33
    2.45
    1.38
    0.96
    2.65
    1.50
    0.99
    2.77
    1.48
    1.01
    2.12
    1.59
    1.06
    0.79
    top



    Passive Crossovers
    Car Audio



     
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