The Design of a 2 way crossover for 4 Ohm loudspeakers    8 Ohm crossover

Frequenzweiche für 2-Weges-System oder Subwoofer If you want to calculate the crossover yourself:
2 way crossover calculator

For a 2 way system or to separate satellites from a subwoofer a 12 dB / octave filter according to the picture on the left should be used. For 8 Ohm systems the values of the following tables are applicable.

To choose a capacitor is straight forward: select the value from the table below and choose a capacitor according to the desired quality level. Standard means: a MKT in series to the tweeter and an unetched electrolytic capacitor in parallel to the woofer (in high powered PA application possibly a MKT). Please take into account the maximum voltage Vac:

Selecting the right coil is a bit more complicated. Important aspects are:

Taking these aspects into consideration, we suggest the coils listed in the table below, indicating coil type, order no and DC resistance.

The colour code indicates the coil's material:
- iron, high power handling
- ferrite, low distortion - even at low volume
- ferrite, T-Core with extremely low distortion
- air, type 1 or 2 with lowest distortion
- large air core coil, type 3 or 4, with lowest distortion

For 4 Ohm loudspeakers:         ... 8 Ohm calculation  

Frequency in Hz 60 90 135 200 275 400 625 900 1200 1500
Cap. C in uF 400 330 200 100 82 68 47 33 22 15
e.g. ClarityCap PX 4x EUR 64,90 excl. VAT: € 54.54 / $ 54.54 4x EUR 53,70 excl. VAT: € 45.13 / $ 45.13 2x EUR 64,90 excl. VAT: € 54.54 / $ 54.54 EUR 64,90 excl. VAT: € 54.54 / $ 54.54 EUR 53,70 excl. VAT: € 45.13 / $ 45.13 EUR 46,00 excl. VAT: € 38.66 / $ 38.66 EUR 26,60 excl. VAT: € 22.35 / $ 22.35 EUR 23,00 excl. VAT: € 19.33 / $ 19.33 EUR 17,50 excl. VAT: € 14.71 / $ 14.71 EUR 12,10 excl. VAT: € 10.17 / $ 10.17
Coil L in mH 15 10 6.8 4.7 3.3 2.2 1.5 1.0 0.82 0.56
Coils
up to 12 Watt
H71
15 mH
1,2 Ohm EUR 18,50 excl. VAT: € 15.55 / $ 15.55
H71
10 mH
0,87 Ohm EUR 15,50 excl. VAT: € 13.03 / $ 13.03
H71
6,8 mH
0,70 Ohm EUR 13,60 excl. VAT: € 11.43 / $ 11.43
H71
4,7 mH
0,46 Ohm EUR 12,60 excl. VAT: € 10.59 / $ 10.59
L100
3,3 mH
1,1Ohm EUR 29,30 excl. VAT: € 24.62 / $ 24.62
L100
2,2 mH
0,83 Ohm EUR 23,40 excl. VAT: € 19.66 / $ 19.66
L100
1,5 mH
0,62 Ohm EUR 19,50 excl. VAT: € 16.39 / $ 16.39
L100
1,00 mH
0,49 Ohm EUR 16,10 excl. VAT: € 13.53 / $ 13.53
L100
0,82 mH
0,44 Ohm EUR 14,60 excl. VAT: € 12.27 / $ 12.27
L100
0,56 mH
0,36 Ohm EUR 12,60 excl. VAT: € 10.59 / $ 10.59
Coils
up to 25 Watt
H100
15 mH
0,83 Ohm EUR 34,20 excl. VAT: € 28.74 / $ 28.74
H100
10 mH
0,64 Ohm EUR 29,30 excl. VAT: € 24.62 / $ 24.62
H100
6,8 mH
0,46 Ohm EUR 23,40 excl. VAT: € 19.66 / $ 19.66
H71
4,7 mH
0,46 Ohm EUR 12,60 excl. VAT: € 10.59 / $ 10.59
H100
3,3 mH
0,27 Ohm EUR 17,50 excl. VAT: € 14.71 / $ 14.71
L100
2,2 mH
0,83 Ohm EUR 23,40 excl. VAT: € 19.66 / $ 19.66
L100
1,5 mH
0,62 Ohm EUR 19,50 excl. VAT: € 16.39 / $ 16.39
L100
1,00 mH
0,49 Ohm EUR 16,10 excl. VAT: € 13.53 / $ 13.53
L100
0,82 mH
0,44 Ohm EUR 14,60 excl. VAT: € 12.27 / $ 12.27
L100
0,56 mH
0,36 Ohm EUR 12,60 excl. VAT: € 10.59 / $ 10.59
Coils
up to 50 Watt
BS125
15 mH
0,59 Ohm EUR 63,60 excl. VAT: € 53.45 / $ 53.45
BS125
10 mH
0,46 Ohm EUR 55,70 excl. VAT: € 46.81 / $ 46.81
BS125
6,8 mH
0,37 Ohm EUR 50,80 excl. VAT: € 42.69 / $ 42.69
BS125
4,7 mH
0,30 Ohm EUR 46,90 excl. VAT: € 39.41 / $ 39.41
H100
3,3 mH
0,27 Ohm EUR 17,50 excl. VAT: € 14.71 / $ 14.71
H100
2,2 mH
0,21 Ohm EUR 15,50 excl. VAT: € 13.03 / $ 13.03
H100
1,5 mH
0,17 Ohm EUR 13,60 excl. VAT: € 11.43 / $ 11.43
L140
1,00 mH
0,30 Ohm EUR 31,20 excl. VAT: € 26.22 / $ 26.22
L140
0,82 mH
0,26 Ohm EUR 28,30 excl. VAT: € 23.78 / $ 23.78
L140
0,56 mH
0,2 Ohm EUR 23,40 excl. VAT: € 19.66 / $ 19.66
Coils
up to 90 Watt
PA-Trafo
mo-123200
0,12 Ohm EUR 84,60 excl. VAT: € 71.09 / $ 71.09
PA-Trafo
mo-125490
0,19 Ohm EUR 30,12 excl. VAT: € 25.31 / $ 25.31
PA-Trafo
mo-125470
0,16 Ohm EUR 31,41 excl. VAT: € 26.39 / $ 26.39
H140
4,7 mH
0,26 Ohm EUR 38,10 excl. VAT: € 32.02 / $ 32.02
H140
3,3 mH
0,19 Ohm EUR 32,20 excl. VAT: € 27.06 / $ 27.06
H140
2,2 mH
0,14 Ohm EUR 25,30 excl. VAT: € 21.26 / $ 21.26
H140
1,5 mH
0,11 Ohm EUR 21,40 excl. VAT: € 17.98 / $ 17.98
L140
1,00 mH
0,30 Ohm EUR 31,20 excl. VAT: € 26.22 / $ 26.22
L140
0,82 mH
0,26 Ohm EUR 28,30 excl. VAT: € 23.78 / $ 23.78
L140
0,56 mH
0,2 Ohm EUR 23,40 excl. VAT: € 19.66 / $ 19.66
Coils
up to 165 Watt
PA-Trafo
mo-123200
0,12Ohm EUR 84,60 excl. VAT: € 71.09 / $ 71.09
PA-Trafo
mo-125490
0,19Ohm EUR 30,12 excl. VAT: € 25.31 / $ 25.31
PA-Trafo
mo-125470
0,16Ohm EUR 31,41 excl. VAT: € 26.39 / $ 26.39
PA-Trafo
mo-125450
0,14Ohm EUR 29,28 excl. VAT: € 24.61 / $ 24.61
BT140
3,3 mH
0,22 Ohm EUR 88,10 excl. VAT: € 74.03 / $ 74.03
BS140
2,2 mH
0,16 Ohm EUR 37,10 excl. VAT: € 31.18 / $ 31.18
BS140
3,3 mH
0,12 Ohm EUR 34,20 excl. VAT: € 28.74 / $ 28.74
H140
1,0 mH
0,08Ohm EUR 18,50 excl. VAT: € 15.55 / $ 15.55
L200
0,82 mH
0,16 Ohm EUR 39,10 excl. VAT: € 32.86 / $ 32.86
L200
0,56 mH
0,11 Ohm - not available
Coils
up to 275 Watt
PA-Trafo
mo-123200
0,12Ohm EUR 84,60 excl. VAT: € 71.09 / $ 71.09
VT180
10 mH
0,27 Ohm EUR 161,60 excl. VAT: € 135.80 / $ 135.80
VT180-68
6,8 mH
0,21 Ohm EUR 151,80 excl. VAT: € 127.56 / $ 127.56
VT180
4,7 mH
0,17 Ohm EUR 127,30 excl. VAT: € 106.97 / $ 106.97
VT180
3,3 mH
0,14 Ohm EUR 117,50 excl. VAT: € 98.74 / $ 98.74
BT140
2,2 mH
0,12 Ohm EUR 78,30 excl. VAT: € 65.80 / $ 65.80
BT140
1,5 mH
0,09 Ohm EUR 62,60 excl. VAT: € 52.61 / $ 52.61
L200
1,0 mH
0,18 Ohm EUR 44,00 excl. VAT: € 36.97 / $ 36.97
H180
0,82 mH
0,06 Ohm EUR 93,00 excl. VAT: € 78.15 / $ 78.15
H180
0,56 mH
0,05 Ohm EUR 28,30 excl. VAT: € 23.78 / $ 23.78
Coils
up to 500 Watt
VT236
15 mH
0,24 Ohm EUR 303,70 excl. VAT: € 255.21 / $ 255.21
VT236
10 mH
0,18 Ohm EUR 264,50 excl. VAT: € 222.27 / $ 222.27
VT236-68
6,8 mH
0,14 Ohm EUR 235,10 excl. VAT: € 197.56 / $ 197.56
VT180
4,7 mH
0,17 Ohm EUR 127,30 excl. VAT: € 106.97 / $ 106.97
VT180
3,3 mH
0,14 Ohm EUR 117,50 excl. VAT: € 98.74 / $ 98.74
VT180
2,2 mH
0,11 Ohm EUR 107,70 excl. VAT: € 90.50 / $ 90.50
VT180
1,5 mH
0,09 Ohm EUR 88,10 excl. VAT: € 74.03 / $ 74.03
VT180
1,0 mH
0,08 Ohm EUR 161,60 excl. VAT: € 135.80 / $ 135.80
VL300
0,82 mH
0,08 Ohm EUR 146,90 excl. VAT: € 123.45 / $ 123.45
VL300
0,56 mH
0,06 Ohm EUR 117,50 excl. VAT: € 98.74 / $ 98.74

Both, the two coils and the two capacitors, should have the values indicated in the table. A subwoofer filter requires only one capacitor and one coil.

The coil in parallel to the tweeter or satellite needs to handle only half / a quarter of the power, if the crossover frequency is higher than 400/800 Hz.

Hint:

1) 18 and 24 dB / octave crossovers only make sense when the driver's exact characteristics are known!

2) This is certainly not a high-end-crossover. Such a crossover needs to be designed according to the drivers used.
 

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