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Loudspeaker Crossover Inductors

Article:  Crossover inductors Pt 1

Article:  Crossover inductors Pt 2

        Review and buy your crossover inductors here. Choose from a comprehensive range of bobbins and crossover inductors for loudspeaker projects. These range from air and ferrite bobbins through to custom wound inductors for speaker projects. Ferrite Inductors are available in six different bobbin sizes which, along with selected wire diameters, allows for the best optimisation of your crossover board layout.
        Thick 1.3mm diameter wire wound on large ferrite bobbins provide for high power handling and low DCR values. Alternatively, smaller diameter wires offer higher inductance values with increased DCR.
        All inductors are wound to order and can be supplied in custom values if needed.

* Ferrite Bobbins

Ferrite Bobbin Cores

Ferrite Core Bobbins.

Six sizes of Ferrite Cored Bobbins suitable for winding custom value Inductors as used in loudspeaker crossovers. Designated as Type A through to G.
A 'guide' to usage is as follows:-

Type A: FBA1823 Small value Inductors for Tweeter frequency modifications / tweeks.
Type B: FBB2728 Low power Bass and Tweeter crossovers to 50w rms max. system power.
Type C: FBC2535 Medium power Bass and Tweeter crossovers to 80w rms max.system power.
Type E, FBE3050, FBF3556 and FBG6256 Medium power Bass and Tweeter crossovers to 100w rms max. system power.
Types F and G use large sized Bobbins and depending upon wire gauge can be targeted at High inductance valus OR High Power.

NOTE (1): The wire specifications for both diameter and cross-sectional area, CSA, are provided for reference.

NOTE (2): All DCR values are calculated values based upon wire length and diameter.

NOTE (3): Intermediate values can be supplied to order, priced at the next higher inductance value.

* Ferrite Core Bobbins. All dims mm are approximate
Order Code Type Max Diam Max Ht Core Diam Core Ht 1+
FBA1823 A 23 18 13 12 0.93 /ea
FBB2728 B 28 27 17 18 1.82 /ea
FBC2535 C 35 25 20 17 2.35 /ea
FBE3050 E 50 30 25 20 5.40 /ea
FBF3556 F 56 35 33 25 4.99 /ea
FBG6256 G 56 62 34 52 13.99 /ea

* Ferrite Inductors TYPE B Bobbin, FBB Series:-  Diam. 28mm, Ht 27mm.

Ferrite Cored Crossover Inductor type B
* Ferrite Inductors / Crossover Coils,   FBB Series   1.0 mm wire,   CSA = 0.78 sq mm.   Priced each
Order Code Spec. 1+    
  Ferrite Inductors, Type B Bobbin.1.0mm wire Tols 10% 5% 2%
FBB10 0.10mH, 1.0mm Wire, DCR 0.040 Ohms 4.62 5.08 5.54
FBB15 0.15mH, 1.0mm Wire, DCR 0.051 Ohms 4.67 5.15 5.61
FBB18 0.18mH, 1.0mm Wire, DCR 0.056 Ohms 4.70 5.18 5.65
FBB22 0.22mH, 1.0mm Wire, DCR 0.062 Ohms 4.73 5.20 5.67
FBB25 0.25mH, 1.0mm Wire, DCR 0.066 Ohms 4.76 5.23 5.71
FBB27 0.27mH, 1.0mm Wire, DCR 0.070 Ohms 4.79 5.27 5.74
 
FBB30 0.30mH, 1.0mm Wire, DCR 0.074 Ohms 4.82 5.30 5.78
FBB33 0.33mH, 1.0mm Wire, DCR 0.079 Ohms 4.85 5.33 5.82
FBB39 0.39mH, 1.0mm Wire, DCR 0.088 Ohms 4.87 5.36 5.85
FBB42 0.42mH, 1.0mm Wire, DCR 0.094 Ohms 4.90 5.40 5.88
FBB47 0.47mH, 1.0mm Wire, DCR 0.099 Ohms 4.92 5.42 5.91
FBB51 0.51mH, 1.0mm Wire, DCR 0.105 Ohms 4.96 5.45 5.94
FBB56 0.56mH, 1.0mm Wire, DCR 0.110 Ohms 4.99 5.49 5.96
FBB60 0.60mH, 1.0mm Wire, DCR 0.114 Ohms 5.02 5.52 6.03

* Ferrite Inductors TYPE C Bobbin, FBC Series:-  Diam. 35mm, Ht 25mm.

ferrite Cored Crossover Inductors type C
* Ferrite Inductors / Crossover Coils, Type C Bobbin   FBC Series    1.0 mm wire,   CSA  0.78 sq mm.   Priced each
Order Code Spec. 1+    
  Ferrite Inductors, Type C Bobbin. 1.0mm wire. Tols 10% 5% 2%
FBCQ10 0.10mH, 1.0mm Wire, DCR 0.04 Ohms 5.24 5.76 6.29
FBCQ15 0.15mH, 1.0mm Wire, DCR 0.05 Ohms 5.29 5.82 6.35
FBCQ20 0.20mH, 1.0mm Wire, DCR 0.06 Ohms 5.34 5.88 6.41
FBCQ22 0.22mH, 1.0mm Wire, DCR 0.06 Ohms 5.45 5.99 6.54
FBCQ33 0.33mH, 1.0mm Wire, DCR 0.08 Ohms 5.60 6.15 6.72
FBCQ47 0.47mH, 1.0mm Wire, DCR 0.10 Ohms 5.71 6.28 6.86
FBCQ56 0.56mH, 1.0mm Wire, DCR 0.11 Ohms 5.81 6.39 6.98
FBCQ68 0.68mH, 1.0mm Wire, DCR 0.12 Ohms 5.85 6.55 7.01
FBCQ75 0.75mH, 1.0mm Wire, DCR 0.125 Ohms 6.03 6.63 7.23
FBCQ82 0.82mH, 1.0mm Wire, DCR 0.13 Ohms 6.09 6.70 7.31
FBCQ91 0.91mH, 1.0mm Wire, DCR 0.14 Ohms 6.16 6.78 7.39
FBCQ100 1.00mH, 1.0mm Wire, DCR 0.15 Ohms 6.22 6.84 7.47


* Ferrite Inductors / Crossover Coils,   FBC Series   0.8mm wire,   CSA 0.50 sq mm   Priced each.
Order Code Spec. 1+    
  Ferrite Inductors, Type C Bobbin 0.8mm wire Tols 10% 5% 2%
FBCT47 0.47mH, 0.8mm Wire, DCR 0.14 Ohms 5.44 5.99 6.52
FBCT56 0.56mH, 0.8mm Wire, DCR 0.16 Ohms 5.52 6.06 6.63
FBCT68 0.68mH, 0.8mm Wire, DCR 0.17 Ohms 5.53 6.09 6.64
FBCT75 0.75mH, 0.8mm Wire, DCR 0.18 Ohms 5.57 6.12 6.68
FBCT82 0.82mH, 0.8mm Wire, DCR 0.19 Ohms 5.59 6.14 6.70
FBCT91 0.91mH, 0.8mm Wire, DCR 0.21 Ohms 5.62 6.17 6.74
FBCT10 1.00mH, 0.8mm Wire, DCR 0.22 Ohms 5.68 6.25 6.81
FBCT12 1.20mH, 0.8mm Wire, DCR 0.24 Ohms 5.88 6.47 7.06
FBCT15 1.50mH, 0.8mm Wire, DCR 0.27 Ohms 5.92 6.51 7.10
FBCT18 1.80mH, 0.8mm Wire, DCR 0.31 Ohms 6.05 6.66 7.26
FBCT22 2.20mH, 0.8mm Wire, DCR 0.35 Ohms 6.18 6.80 7.41
FBCT25 2.50mH, 0.8mm Wire, DCR 0.38 Ohms 6.36 7.00 7.78

 

* Ferrite Inductors TYPE E Bobbin, FBE Series:-  Diam. 50mm, Ht 30mm.

Ferrite Cored Crossover Inductors type-E
* Ferrite Inductors / Crossover Coils,   FBE Series   1.25 mm wire,   CSA 1.23 sq mm   Priced each.
Order Code Spec. 1+  
  Ferrite Inductors, Type E Bobbin 1.25mm wire Tols 10% 5%
FBEQ10 1.00mH, 1.25mm Wire, DCR 0.09 Ohms 9.98 10.98
FBEQ15 1.50mH, 1.25mm Wire, DCR 0.11 Ohms 10.81 11.89
FBEQ18 1.80mH, 1.25mm Wire, DCR 0.13 Ohms 11.19 12.31
FBEQ20 2.00mH, 1.25mm Wire, DCR 0.14 Ohms 11.41 12.55
FBEQ25 2.50mH, 1.25mm Wire, DCR 0.15 Ohms 12.01 13.21
FBEQ27 2.70mH, 1.25mm Wire, DCR 0.16 Ohms 12.21 13.43
FBEQ30 3.00mH, 1.25mm Wire, DCR 0.18 Ohms 12.62 13.88
FBEQ33 3.30mH, 1.25mm Wire, DCR 0.19 Ohms 12.92 14.21
FBEQ39 3.90mH, 1.25mm Wire, DCR 0.21 Ohms 13.64 15.00
FBEQ42 4.20mH, 1.25mm Wire, DCR 0.23 Ohms 13.97 15.37
FBEQ47 4.70mH, 1.25mm Wire, DCR 0.24 Ohms 14.52 15.97


* Ferrite Inductors / Crossover Coils,  FBE Series   1.12 mm wire,   CSA 0.985 sq mm   Priced each.
Order Code Spec. 1+  
  Ferrite Inductors, Type E Bobbin 1.12mm wire Tols 10% 5%
FBET20 2.00mH, 1.12mm Wire, DCR 0.17 Ohms 10.64 11.70
FBET22 2.20mH, 1.12mm Wire, DCR 0.18 Ohms 10.97 12.06
FBET25 2.50mH, 1.12mm Wire, DCR 0.19 Ohms 11.11 12.22
FBET27 2.70mH, 1.12mm Wire, DCR 0.21 Ohms 11.30 12.43
FBET30 3.00mH, 1.12mm Wire, DCR 0.22 Ohms 11.60 12.76
FBET33 3.30mH, 1.12mm Wire, DCR 0.23 Ohms 11.74 12.91
FBET39 3.90mH, 1.12mm Wire, DCR 0.26 Ohms 12.43 13.67
FBET42 4.20mH, 1.12mm Wire, DCR 0.28 Ohms 12.70 13.97
FBET47 4.70mH, 1.12mm Wire, DCR 0.30 Ohms 12.92 14.21

 

     Are you building that LF Bass speaker enclosure and can't or don't want to use "Active" crossovers"? Then the following Inductors wound on a larger size Ferrite bobbin may just be the answer. Larger Bobbins for higher inductances and / or thicker wire for higher power.

* Ferrite Inductors TYPE F Bobbin, FBF Series:-   Diam. 56mm, Ht 35mm.

Feritte Cored Crossover Inductors Type F
* Ferrite Inductors / Crossover Coils,   FBF Series,   1.32 mm wire,  CSA 1.38 sq mm,   Priced each.  
Order Code Spec. 1+  
  Ferrite Inductors, Type F Bobbin. 1.32mm Wire Tols 10% 5%
FBFQ10 1.0mH, 1.32mm Wire, DCR 0.10 Ohms 10.17 11.18
FBFQ15 1.5mH, 1.32mm Wire, DCR 0.13 Ohms 11.19 12.31
FBFQ18 1.8mH, 1.32mm Wire, DCR 0.14 Ohms 11.63 12.79
FBFQ20 2.0mH, 1.32mm Wire, DCR 0.15 Ohms 12.04 13.24
FBFQ25 2.5mH, 1.32mm Wire, DCR 0.17 Ohms 12.84 14.12
FBFQ27 2.7mH, 1.32mm Wire, DCR 0.18 Ohms 13.22 14.66
FBFQ30 3.0mH, 1.32mm Wire, DCR 0.19 Ohms 13.69 15.05
FBFQ33 3.3mH, 1.32mm Wire, DCR 0.21 Ohms 14.19 15.61


* Ferrite Inductors / Crossover Coils,,   FBF Series   1.25 mm wire,  CSA 1.23 sq mm, Priced each.   
Order Code Spec. 1+  
  Ferrite Inductors, Type F Bobbin. 1.25mm Wire Tols 10% 5%
FBFT10 1.0mH, 1.25mm Wire, DCR 0.11 Ohms 9.76 10.74
FBFT15 1.5mH, 1.25mm Wire, DCR 0.14 Ohms 10.72 11.79
FBFT18 1.8mH, 1.25mm Wire, DCR 0.16 Ohms 11.22 12.34
FBFT20 2.0mH, 1.25mm Wire, DCR 0.17 Ohms 11.52 12.67
FBFT25 2.5mH, 1.25mm Wire, DCR 0.19 Ohms 12.21 13.43
FBFT27 2.7mH, 1.25mm Wire, DCR 0.20 Ohms 12.51 13.76
FBFT30 3.0mH, 1.25mm Wire, DCR 0.22 Ohms 12.93 14.22
FBFT33 3.3mH, 1.25mm Wire, DCR 0.23 Ohms 13.37 14.71
FBFT39 3.9mH, 1.25mm Wire, DCR 0.26 Ohms 14.36 15.79


* Ferrite Inductors / Crossover Coils,    FBF Series   1.0 mm wire,  CSA 0.78 sq mm,   Priced each.   
Order Code Spec. 1+  
  Ferrite Inductors, Type F Bobbin. Diam 56mm, Height 35mm Tols 10% 5%
FBFA39 3.9mH, 1.0mm Wire, DCR 0.36 Ohms 10.48 11.53
FBFA42 4.2mH, 1.0mm Wire, DCR 0.37 Ohms 10.95 12.05
FBFA47 4.7mH, 1.0mm Wire, DCR 0.40 Ohms 11.03 12.13
FBFA56 5.6mH, 1.0mm Wire, DCR 0.44 Ohms 11.53 12.68
FBFA68 6.8mH, 1.0mm Wire, DCR 0.49 Ohms 12.27 13.50
FBFA75 7.5mH, 1.0mm Wire, DCR 0.53 Ohms 12.77 14.25
FBFA82 8.2mH, 1.0mm Wire, DCR 0.59 Ohms 13.38 14.72
FBFA91 9.1mH, 1.0mm Wire, DCR 0.60 Ohms 13.62 14.98
FBFA100 10.0mH, 1.0mm Wire, DCR 0.64 Ohms 14.14 15.55


* High Power Ferrite Inductors TYPE G Bobbin, FBG Series:-  Diam. 56mm, Ht 62mm.

High Power Crossover Inductors type G








* High Power Ferrite Inductors / Crossover Coils,   FBG Series,   1.32 mm wire,  CSA 1.37 sq mm,   Priced each.   
Order Code Spec. 1+  
  Ferrite Inductors, Type G Bobbin. Diam 56mm, Height 62mm Tols 10% 5%
FBGQ56 5.6mH, 1.32mm Wire, DCR 0.27 Ohms 25.72 26.36
FBGQ62 6.2mH, 1.32mm Wire, DCR 0.29 Ohms 26.18 26.83
FBGQ69 6.8mH, 1.32mm Wire, DCR 0.30 Ohms 26.62 27.29
FBGQ75 7.5mH, 1.32mm Wire, DCR 0.32 Ohms 27.08 27.76
FBGQ82 8.2mH, 1.32mm Wire, DCR 0.34 Ohms 27.58 28.27
FBGQ91 9.1mH, 1.32mm Wire, DCR 0.37 Ohms 28.24 28.95
FBGQ100 10.0mH, 1.32mm Wire, DCR 0.39 Ohms 28.80 29.52


* High Power Ferrite Inductors / Crossover Coils,   FBG Series,   1.25 mm wire,  CSA 1.23 sq mm,   Priced each.   
Order Code Spec. 1+  
  Ferrite Inductors, Type G Bobbin. Diam 56mm, Height 62mm Tols 10% 5%
FBGT82 8.2mH, 1.25mm Wire, DCR 0.37 Ohms 26.40 27.06
FBGT91 9.1mH, 1.25mm Wire, DCR 0.39 Ohms 26.90 27.57
FBGT100 10.0mH, 1.25mm Wire, DCR 0.42 Ohms 27.44 28.13
FBGT110 11.0mH, 1.25mm Wire, DCR 0.44 Ohms 27.96 28.66
FBGT120 12.0mH, 1.25mm Wire, DCR 0.47 Ohms 28.48 29.19
FBGT130 13.0mH, 1.25mm Wire, DCR 0.49 Ohms 29.04 29.77
FBGT140 14.0mH, 1.25mm Wire, DCR 0.52 Ohms 29.56 30.30
FBGT150 15.0mH, 1.25mm Wire, DCR 0.54 Ohms 30.02 30.77


* Air Core Bobbins

Air Cored Bobbins

Three sizes of Glass reinforced polyamid coil formers suitable for the DIY constructor to wind custom coils for that special project. Using 1.0mm copper wire the following inductance ranges can be achieved.
Type 1 Bobbin (0.1 - 0.39)mH,
Type 2 Bobbin(0.1 - 0.91)mH,
Type 3 Bobbin 0.47 - 2.2)mH.

* Air Cored Bobbins. Price Each.
Order Code Spec. 1+ 6+ 11+
ACFRMS1 Air Core Bobbin Height 17mm. Diam 40mm. 0.88 /ea 0.84 /ea 0.79 /ea
ACFRMS2 Air Core Bobbin Height 15mm. Diam 47mm. 1.61 /ea 1.53 /ea 1.45 /ea
ACFRMS3 Air Core Bobbin Height 25mm. Diam 58mm. 1.18 /ea 1.12 /ea 1.06 /ea


 

* Air Core Inductors

Air Cored Crossover Inductors

Air Core Inductors.

Air cored crossover inductors wound on hard glass-reinforced Polyamid formers.
Type 1 Bobbin (0.1 to 0.39)mH, (17 * 40)mm,
Type 2 Bobbin (0.1 to 0.68)mH, (15 * 47)mm,
Type 3 Bobbin (0.47 to 2.2)mH, (25 * 58)mm.
Centre boltdown with M4 Nylon bolt or fix with Silicone.
Tolerances +/- (10%, 5% or 2%).

* Air Cored Crossover Coils, Type 1 Bobbin, (17 * 40)mm. 10%, 5%, 2%. Price Each.
Order Code Spec. 1+    
  Air Cored Coils, Type 1 Bobbin. Tols 10% 5% 2%
ACC110 0.10mH, 1.0mm Wire, DCR 0.12 Ohms 4.40 4.82 5.24
ACC115 0.15mH, 1.0mm Wire, DCR 0.16 Ohms 4.68 5.12 5.58
ACC122 0.22mH, 1.0mm Wire, DCR 0.20 Ohms 5.41 5.92 6.44
ACC133 0.33mH, 1.0mm Wire, DCR 0.25 Ohms 5.66 6.21 6.75
ACC139 0.39mH, 1.0mm Wire, DCR 0.29 Ohms 5.82 6.37 6.93


* Air Cored Coils, Type 2 Bobbin, (15 * 47)mm. 10%, 5%, 2%. Price Each.
Order Code Spec. 1+    
  Air Cored Inductors, Type 2 Bobbin. Tols 10% 5% 2%
ACC210 0.10mH, 1.0mm Wire, DCR 0.13 Ohms 5.06 5.49 5.93
ACC215 0.15mH, 1.0mm Wire, DCR 0.16 Ohms 5.36 5.78 6.24
ACC222 0.22mH, 1.0mm Wire, DCR 0.20 Ohms 5.68 6.12 6.61
ACC233 0.33mH, 1.0mm Wire, DCR 0.25 Ohms 5.99 6.47 6.98
ACC239 0.39mH, 1.0mm Wire, DCR 0.27 Ohms 6.32 6.82 7.36
ACC247 0.47mH, 1.0mm Wire, DCR 0.30 Ohms 6.73 7.27 7.86
ACC256 0.56mH, 1.0mm Wire, DCR 0.34 Ohms 7.08 7.65 8.25
ACC268 0.68mH, 1.0mm Wire, DCR 0.38 Ohms 7.51 8.10 8.73


* Air Core Crossover Coils, Type 3 Bobbin, (25 * 58)mm. 10%, 5%, 2%. Price Each.
Order Code Spec. 1+    
Air Cored Inductors, Type 3 Bobbin. Tolerance 10% 5% 2%
ACC347 0.47mH, 1.0mm Wire, DCR 0.30 Ohms 5.93 6.51 7.09
ACC356 0.56mH, 1.0mm Wire, DCR 0.34 Ohms 6.36 6.97 7.58
ACC368 0.68mH, 1.0mm Wire, DCR 0.38 Ohms 6.78 7.44 8.10
ACC375 0.75mH, 1.0mm Wire, DCR 0.41 Ohms 7.10 7.79 8.46
ACC382 0.82mH, 1.0mm Wire, DCR 0.45 Ohms 7.41 8.14 8.85
ACC391 0.91mH, 1.0mm Wire, DCR 0.49 Ohms 7.84 8.60 9.37
ACC310 1.00mH, 1.0mm Wire, DCR 0.51 Ohms 8.25 9.05 9.86
ACC312 1.20mH, 1.0mm Wire, DCR 0.60 Ohms 9.09 9.99 10.86
ACC315 1.50mH, 1.0mm Wire, DCR 0.64 Ohms 9.94 10.92 11.90
ACC318 1.80mH, 1.0mm Wire, DCR 0.71 Ohms 10.41 11.41 12.44
ACC322 2.20mH, 1.0mm Wire, DCR 0.81 Ohms 10.82 11.88 12.94

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