Trafo BT100 BT125 BT140 T200 T250 T300 cfc CFT Zero-Ohm-Coil (ZOC) N250 N300 N390 cfc CFN SFN SGFN

Mundorf Feron transformer core coils

Mundorf, der Spezialist für Spulen und Kondensatoren

For the transformer core coils t84 to t150 Mundorf uses nothing but FERON which is extremely low in losses and distortions. This material is a grain-oriented silicon iron with a sheet thickness of 0.35 mm. This high quality initial material is subsequently heat treated in a special process. In this way, distortions in the material's crystal lattice structure, caused by rolling and stamping, are eliminated. In this way, FERON is provided with a crystal lattice structure which displays optimum magnetic properties. Such a core material is used for the manufacture of high quality audio transformers. It is very seldom used in "normal" transformers, except where very low power loss is important. In this construction type, coils can be manufactured with very low internal resistances and extreme load-bearing capacity. These are the preconditions for a precise deep bass. The ratios of inductivity to internal resistance achieved here can often not even be realised with pure air cored coils, or only at considerably greater financial cost.

Technical Specifications: Tolerance: max. 3%
core material: FERON
Elektrolyte copper 99.99% pure
Grain-oriented silicon iron 0.35 mm

In non-impregnated coils, vibration occurs as a result of the current flowing through the coil. The microphonic effect, i.e. the conversion of mechanical into electric oscillations, adds these oscillations back to the original signal as additional information. In this way, details of the original signal are overlaid and rendered unrecognisable. The music loses spatial quality and transparency. This process is prevented by vacuum impregnation.

In vacuum impregnation, the coil is first impregnated with a special lacquer under vacuum. Because of the vacuum, this lacquer flows right into the innermost windings. The lacquer is subsequently dried in an oven at 130 °C. Thus the whole coil is baked into a very solid unit. The individual windings are prevented from vibrating and the original signal remains uncorrupted.
additional charge for vacuum impregnation     EUR 19,50 excl. VAT: € 16.81 / $ 19.67 per coil

Beside vacuum impregnated coils we offer the baked varnish air coil.

The windings of baked varnish coils are made using a special wire. After the coil has been wound it is heated up causing an additional layer of varnish on the wire to melt, bonding the individual windings firmly together. The effect is similar to that achieved with vacuum impregnation, but this process is cheaper for small coils. Baked varnish coils are available with winding diameters from 0.71mm - 1.40mm. All series are identified with a "B" prefix.
Please note: *) Pmax 8 Ohm is the maximum power that this coil is able to deliver to the bass driver.
The values are valid for free air convection and 20°C. For 4 Ohm speakers this value has to be halved.

 

Mundorf-Spulen Feron transformer core coil BT100 with baked 1.0 mm wire

Product ID L/mH R/Ohm Wire-
D/mm
Pmax*)
8Ohm
Coil Size
(DxH/mm)
Price
M-bt100-100 10.0 0.74 1.00 88 W 84x60x60 EUR 48,64 excl. VAT: € 41.93 / $ 49.06
M-bt100-120 12.0 0.81 1.00 84 W 84x60x60 - not available
M-bt100-150 15.0 0.91 1.00 80 W 84x60x60 EUR 50,59 excl. VAT: € 43.61 / $ 51.03
M-bt100-180 18.0 1.0 1.00 75 W 84x60x60 EUR 51,57 excl. VAT: € 44.46 / $ 52.01
M-bt100-220 22.0 1.1 1.00 74 W 84x60x60 EUR 52,54 excl. VAT: € 45.29 / $ 52.99
M-bt100-270 27.0 1.3 1.00 90 W 96x73x76 - not available
M-bt100-330 33.0 1.4 1.00 88 W 96x73x76 - not available
*) Pmax 8 Ohm is the maximum power that this coil is able to deliver to the bass driver.
The values are valid for free air convection and 20°C. For 4 Ohm speakers this value has to be halved.
Transformer Coils BT100 BT125 BT140 T200 T250 T300 cfc CFT Zero-Ohm-Coil (ZOC) N250 N300 N390 cfc CFN SFN SGFN  

 

Mundorf-Spulen Feron transformer core coil BT125 with baked 1.25 mm wire

Product ID L/mH R/Ohm Wire-
D/mm
Pmax*)
8Ohm
Coil Size
(DxH/mm)
Price
M-bt125-33 3.3 0.27 1.25 240 W 84x60x60 - not available
M-bt125-39 3.9 0.29 1.25 235 W 84x60x60 EUR 75,64 excl. VAT: € 65.21 / $ 76.29
M-bt125-47 4.7 0.31 1.25 236 W 84x60x60 EUR 76,62 excl. VAT: € 66.05 / $ 77.28
*) Pmax 8 Ohm is the maximum power that this coil is able to deliver to the bass driver.
The values are valid for free air convection and 20°C. For 4 Ohm speakers this value has to be halved.
Transformer Coils BT100 BT125 BT140 T200 T250 T300 cfc CFT Zero-Ohm-Coil (ZOC) N250 N300 N390 cfc CFN SFN SGFN  

 

Mundorf-Spulen Feron transformer core coil BT140 with baked 1.4 mm wire

Product ID L/mH R/Ohm Wire-
D/mm
Pmax*)
8Ohm
Coil Size
(DxH/mm)
Price
M-bt140-10 1.0 0.07 1.4 796 W 84x60x60 EUR 54,69 excl. VAT: € 47.15 / $ 55.16
M-bt140-12 1.2 0.08 1.4 728 W 84x60x60 EUR 57,51 excl. VAT: € 49.58 / $ 58.01
M-bt140-15 1.5 0.09 1.4 721 W 84x60x60 EUR 58,44 excl. VAT: € 50.38 / $ 58.94
M-bt140-18 1.8 0.10 1.4 682 W 84x60x60 EUR 66,04 excl. VAT: € 56.93 / $ 66.61
M-bt140-20 2.0 0.11 1.4 665 W 84x60x60 EUR 67,94 excl. VAT: € 58.57 / $ 68.53
M-bt140-22 2.2 0.12 1.4 651 W 84x60x60 EUR 69,89 excl. VAT: € 60.25 / $ 70.49
M-bt140-27 2.7 0.17 1.4 499 W 84x60x60 EUR 71,79 excl. VAT: € 61.89 / $ 72.41
M-bt140-30 3.0 0.19 1.4 464 W 84x60x60 EUR 73,74 excl. VAT: € 63.57 / $ 74.38
M-bt140-33 3.3 0.22 1.4 412 W 84x60x60 EUR 75,64 excl. VAT: € 65.21 / $ 76.29
M-bt140-39 3.9 0.25 1.4 439 W 96x73x76 EUR 90,31 excl. VAT: € 77.85 / $ 91.09
M-bt140-47 4.7 0.27 1.4 427 W 96x73x76 EUR 92,22 excl. VAT: € 79.50 / $ 93.02
M-bt140-56 5.6 0.30 1.4 402 W 96x73x76 EUR 94,12 excl. VAT: € 81.14 / $ 94.93
M-bt140-60 6.0 0.32 1.4 402 W 96x73x76 EUR 62,29 excl. VAT: € 53.70 / $ 62.83
M-bt140-68 6.8 0.32 1.4 394 W 96x73x76 EUR 96,07 excl. VAT: € 82.82 / $ 96.90
M-bt140-82 8.2 0.35 1.4 376 W 96x73x76 EUR 97,97 excl. VAT: € 84.46 / $ 98.81
M-bt140-100 10.0 0.39 1.4 359 W 96x73x76 EUR 100,84 excl. VAT: € 86.93 / $ 101.71
M-bt140-120 12.0 0.45 1.4 332 W 96x73x76 EUR 103,77 excl. VAT: € 89.46 / $ 104.66
*) Pmax 8 Ohm is the maximum power that this coil is able to deliver to the bass driver.
The values are valid for free air convection and 20°C. For 4 Ohm speakers this value has to be halved.
Transformer Coils BT100 BT125 BT140 T200 T250 T300 cfc CFT Zero-Ohm-Coil (ZOC) N250 N300 N390 cfc CFN SFN SGFN  

 

Mundorf-Spulen Feron transformer core coil T200 with 2.0 mm wire

Baked varnish coils are only available with winding diameters from 0.71mm - 1.40mm. These series are identified with a "B" prefix.

Beside the baked varnish air coil we offer vacuum impregnated coils.
additional charge for vacuum impregnation     EUR 19,50 excl. VAT: € 16.81 / $ 19.67 per coil

 

Product ID L/mH R/Ohm Wire-
D/mm
Pmax*)
8Ohm
Coil Size
(DxH/mm)
Price
M-t200-047 0.47 0.05 2.0 1164 W 84x60x60 EUR 47,72 excl. VAT: € 41.14 / $ 48.13
M-t200-056 0.56 0.05 2.0 1297 W 84x60x60 EUR 48,11 excl. VAT: € 41.47 / $ 48.52
M-t200-068 0.68 0.06 2.0 1136 W 84x60x60 EUR 48,69 excl. VAT: € 41.97 / $ 49.11
M-t200-082 0.82 0.06 2.0 1220 W 84x60x60 EUR 48,84 excl. VAT: € 42.10 / $ 49.26
M-t200-10 1.0 0.07 2.0 1117 W 84x60x60 EUR 71,06 excl. VAT: € 61.26 / $ 71.67
M-t200-12 1.2 0.08 2.0 1060 W 84x60x60 EUR 73,99 excl. VAT: € 63.78 / $ 74.63
M-t200-15 1.5 0.09 2.0 1007 W 84x60x60 EUR 75,94 excl. VAT: € 65.47 / $ 76.59
M-t200-18 1.8 0.08 2.0 1406 W 96x73x76 EUR 84,71 excl. VAT: € 73.03 / $ 85.44
M-t200-20 2.0 0.09 2.0 1341 W 96x73x76 EUR 86,66 excl. VAT: € 74.71 / $ 87.41
M-t200-22 2.2 0.09 2.0 1433 W 96x73x76 EUR 88,61 excl. VAT: € 76.39 / $ 89.37
M-t200-27 2.7 0.10 2.0 1399 W 96x73x76 EUR 91,53 excl. VAT: € 78.91 / $ 92.32
M-t200-30 3.0 0.11 2.0 1359 W 96x73x76 EUR 94,46 excl. VAT: € 81.43 / $ 95.27
M-t200-33 3.3 0.10 2.0 903 W 106x78x88 EUR 103,33 excl. VAT: € 89.08 / $ 104.22
M-t200-39 3.9 0.11 2.0 915 W 106x78x88 EUR 106,25 excl. VAT: € 91.59 / $ 107.17
M-t200-47 4.7 0.14 2.0 756 W 106x78x88 EUR 109,18 excl. VAT: € 94.12 / $ 110.12
M-t200-56 5.6 0.15 2.0 757 W 106x78x88 EUR 112,10 excl. VAT: € 96.64 / $ 113.07
M-t200-68 6.8 0.18 2.0 674 W 106x78x88 EUR 114,05 excl. VAT: € 98.32 / $ 115.03
M-t200-82 8.2 0.20 2.0 658 W 106x78x88 EUR 116,97 excl. VAT: € 100.84 / $ 117.98
M-t200-100 10.0 0.22 2.0 639 W 106x78x88 EUR 119,90 excl. VAT: € 103.36 / $ 120.93
M-t200-120 12.0 0.19 2.0 820 W 130x95x105 EUR 150,12 excl. VAT: € 129.41 / $ 151.41
M-t200-150 15.0 0.28 2.0 585 W 130x95x105 EUR 159,87 excl. VAT: € 137.82 / $ 161.25
M-t200-180 18.0 0.33 2.0 533 W 130x95x105 EUR 169,61 excl. VAT: € 146.22 / $ 171.07
M-t200-220 22.0 0.37 2.0 508 W 130x95x105 EUR 179,36 excl. VAT: € 154.62 / $ 180.91
M-t200-270 27.0 0.41 2.0 497 W 130x95x105 EUR 188,13 excl. VAT: € 162.18 / $ 189.75
M-t200-330 33.0 0.48 2.0 454 W 130x95x105 EUR 197,88 excl. VAT: € 170.59 / $ 199.59
M-t200-390 39.0 0.48 2.0 391 W 150x111x107 EUR 244,67 excl. VAT: € 210.92 / $ 246.78
M-t200-470 47.0 0.58 2.0 345 W 150x111x107 EUR 264,17 excl. VAT: € 227.73 / $ 266.45
*) Pmax 8 Ohm is the maximum power that this coil is able to deliver to the bass driver.
The values are valid for free air convection and 20°C. For 4 Ohm speakers this value has to be halved.
Transformer Coils BT100 BT125 BT140 T200 T250 T300 cfc CFT Zero-Ohm-Coil (ZOC) N250 N300 N390 cfc CFN SFN SGFN  

 

Mundorf-Spulen Feron transformer core coil T250 with 2.5 mm wire

Baked varnish coils are only available with winding diameters from 0.71mm - 1.40mm. These series are identified with a "B" prefix.

Beside the baked varnish air coil we offer vacuum impregnated coils.
additional charge for vacuum impregnation     EUR 19,50 excl. VAT: € 16.81 / $ 19.67 per coil

 

Product ID L/mH R/Ohm Wire-
D/mm
Pmax*)
8Ohm
Coil Size
(DxH/mm)
Price
M-t250-10 1.0 0.04 2.5 3017 W 96x73x76 EUR 94,46 excl. VAT: € 81.43 / $ 95.27
M-t250-12 1.2 0.04 2.5 3223 W 96x73x76 EUR 99,33 excl. VAT: € 85.63 / $ 100.19
M-t250-15 1.5 0.05 2.5 2798 W 96x73x76 EUR 100,31 excl. VAT: € 86.47 / $ 101.17
M-t250-18 1.8 0.05 2.5 2990 W 96x73x76 EUR 103,33 excl. VAT: € 89.08 / $ 104.22
M-t250-20 2.0 0.06 2.5 1677 W 106x78x88 EUR 116,97 excl. VAT: € 100.84 / $ 117.98
M-t250-22 2.2 0.07 2.5 1512 W 106x78x88 EUR 119,90 excl. VAT: € 103.36 / $ 120.93
M-t250-27 2.7 0.07 2.5 1622 W 106x78x88 EUR 122,82 excl. VAT: € 105.88 / $ 123.88
M-t250-30 3.0 0.08 2.5 1516 W 106x78x88 EUR 125,75 excl. VAT: € 108.41 / $ 126.83
M-t250-33 3.3 0.08 2.5 1645 W 106x78x88 EUR 128,67 excl. VAT: € 110.92 / $ 129.78
M-t250-39 3.9 0.09 2.5 1563 W 106x78x88 EUR 131,60 excl. VAT: € 113.45 / $ 132.73
M-t250-47 4.7 0.08 2.5 1948 W 130x95x105 EUR 170,59 excl. VAT: € 147.06 / $ 172.06
M-t250-56 5.6 0.09 2.5 1821 W 130x95x105 EUR 179,36 excl. VAT: € 154.62 / $ 180.91
M-t250-68 6.8 0.12 2.5 1465 W 130x95x105 EUR 184,24 excl. VAT: € 158.83 / $ 185.83
M-t250-82 8.2 0.14 2.5 1342 W 130x95x105 EUR 189,11 excl. VAT: € 163.03 / $ 190.74
M-t250-100 10.0 0.16 2.5 1274 W 130x95x105 EUR 193,98 excl. VAT: € 167.22 / $ 195.65
M-t250-120 12.0 0.19 2.5 1146 W 130x95x105 EUR 197,88 excl. VAT: € 170.59 / $ 199.59
M-t250-150 15.0 0.17 2.5 977 W 150x111x107 EUR 235,90 excl. VAT: € 203.36 / $ 237.93
M-t250-180 18.0 0.22 2.5 794 W 150x111x107 EUR 249,55 excl. VAT: € 215.13 / $ 251.70
M-t250-220 22.0 0.25 2.5 750 W 150x111x107 EUR 264,17 excl. VAT: € 227.73 / $ 266.45
*) Pmax 8 Ohm is the maximum power that this coil is able to deliver to the bass driver.
The values are valid for free air convection and 20°C. For 4 Ohm speakers this value has to be halved.
Transformer Coils BT100 BT125 BT140 T200 T250 T300 cfc CFT Zero-Ohm-Coil (ZOC) N250 N300 N390 cfc CFN SFN SGFN  

 

Mundorf-Spulen Feron transformer core coil T300 with 3.0 mm wire

Baked varnish coils are only available with winding diameters from 0.71mm - 1.40mm. These series are identified with a "B" prefix.

Beside the baked varnish air coil we offer vacuum impregnated coils.
additional charge for vacuum impregnation     EUR 19,50 excl. VAT: € 16.81 / $ 19.67 per coil

 

Product ID L/mH R/Ohm Wire-
D/mm
Pmax*)
8Ohm
Coil Size
(DxH/mm)
Price
M-t300-10 1.0 0.03 3.0 3785 W 106x78x88 EUR 117,95 excl. VAT: € 101.68 / $ 118.97
M-t300-12 1.2 0.03 3.0 4043 W 106x78x88 EUR 120,87 excl. VAT: € 104.20 / $ 121.91
M-t300-15 1.5 0.04 3.0 3290 W 106x78x88 EUR 123,80 excl. VAT: € 106.72 / $ 124.87
M-t300-18 1.8 0.04 3.0 3516 W 106x78x88 EUR 126,72 excl. VAT: € 109.24 / $ 127.81
M-t300-20 2.0 0.05 3.0 2638 W 130x95x105 EUR 169,61 excl. VAT: € 146.22 / $ 171.07
M-t300-22 2.2 0.05 3.0 2877 W 130x95x105 EUR 174,49 excl. VAT: € 150.42 / $ 175.99
M-t300-27 2.7 0.07 3.0 2226 W 130x95x105 EUR 178,39 excl. VAT: € 153.78 / $ 179.93
M-t300-30 3.0 0.06 3.0 2731 W 130x95x105 EUR 183,26 excl. VAT: € 157.98 / $ 184.84
M-t300-33 3.3 0.06 3.0 2931 W 130x95x105 EUR 188,13 excl. VAT: € 162.18 / $ 189.75
M-t300-39 3.9 0.07 3.0 2683 W 130x95x105 EUR 193,98 excl. VAT: € 167.22 / $ 195.65
M-t300-47 4.7 0.07 3.0 2912 W 130x95x105 EUR 200,81 excl. VAT: € 173.11 / $ 202.54
M-t300-56 5.6 0.09 3.0 2420 W 130x95x105 EUR 202,76 excl. VAT: € 174.79 / $ 204.51
M-t300-68 6.8 0.10 3.0 1662 W 150x111x107 EUR 273,92 excl. VAT: € 236.14 / $ 276.28
M-t300-82 8.2 0.10 3.0 1747 W 150x111x107 EUR 282,69 excl. VAT: € 243.70 / $ 285.13
M-t300-100 10.0 0.12 3.0 1562 W 150x111x107 EUR 292,44 excl. VAT: € 252.10 / $ 294.96
M-t300-120 12.0 0.13 3.0 1540 W 150x111x107 EUR 306,08 excl. VAT: € 263.86 / $ 308.72
M-t300-150 15.0 0.15 3.0 1449 W 150x111x107 EUR 340,20 excl. VAT: € 293.28 / $ 343.13
*) Pmax 8 Ohm is the maximum power that this coil is able to deliver to the bass driver.
The values are valid for free air convection and 20°C. For 4 Ohm speakers this value has to be halved.
Transformer Coils BT100 BT125 BT140 T200 T250 T300 cfc CFT Zero-Ohm-Coil (ZOC) N250 N300 N390 cfc CFN SFN SGFN  

 

Mundorf-Spulen Feron copper foil transformer core coil CFT

Mundorf, der Spezialist für Spulen und Kondensatoren Mundorf also delivers OFC (oxygen-free copper) copper foil coils produced in its own factory. It is extremely pure, and it has a special crystal lattice structure. The outstanding audio characteristics of this precious material are further enhanced by the electrical benefits of the coil design: In contrast to conventional coils, where the individual turns of the windings lie side by side, the windings in these units are directly on top of one another, bringing them significantly closer to the theoretically ideal coil.
Technical Specifications: Tolerance: max. 3%
core material: FERON
Elektrolyte copper 99.99% pure
Isolation: Polypropylen 20 µ
Grain-oriented silicon iron 0.35 mm

Product ID L/mH R/Ohm Wire-
D/mm
Pmax*)
8Ohm
Coil Size
(DxH/mm)
Price
M-cft14-18 1,8 0,15 28x0,075 604 W 84x60x60 EUR 55,47 excl. VAT: € 47.82 / $ 55.95
M-cft12-27 2.7 0.13 44x0.075 695 W 106x78x88 EUR 131,01 excl. VAT: € 112.94 / $ 132.14
M-cft12-33 3.3 0.15 44x0.075 645 W 106x78x88 EUR 140,81 excl. VAT: € 121.39 / $ 142.02
M-cft12-39 3.9 0.17 44x0.075 607 W 106x78x88 EUR 145,68 excl. VAT: € 125.59 / $ 146.94
M-cft12-47 4.7 0.19 44x0.075 577 W 106x78x88 EUR 150,75 excl. VAT: € 129.96 / $ 152.05
M-cft12-56 5.6 0.21 44x0.075 553 W 106x78x88 EUR 154,80 excl. VAT: € 133.45 / $ 156.13
M-cft12-68 6.8 0.22 44x0.075 557 W 106x78x88 EUR 159,87 excl. VAT: € 137.82 / $ 161.25
*) Pmax 8 Ohm is the maximum power that this coil is able to deliver to the bass driver.
The values are valid for free air convection and 20°C. For 4 Ohm speakers this value has to be halved.
Transformer Coils BT100 BT125 BT140 T200 T250 T300 cfc CFT Zero-Ohm-Coil (ZOC) N250 N300 N390 cfc CFN SFN SGFN  

 
 

Mundorf Mundorf Zero Ohm coils

Null Ohm Spule The zero ohm coil (ZOC) is a special form of transformer core coil. This is also made of the top quality material FERON described in the chapter "Transformer Core Coils". In the ZOC, an air gap is calibrated and adjusted by hand between the two laminated cores (one I-shaped and one E-shaped). The air gap determines the inductivity of the coil and demands great care in the manufacturing process. It must not be too small, as saturation effects would otherwise occur at high loadings. The high production costs of the ZOC, and thus its higher price, are always justified when maximum faithfulness in pulse reproduction is required.
Technical Specifications: Tolerance: max. 3%
core material: FERON
Elektrolyte copper 99.99% pure
Grain-oriented silicon iron 0.35 mm
In non-impregnated coils, vibration occurs as a result of the current flowing through the coil. The microphonic effect, i.e. the conversion of mechanical into electric oscillations, adds these oscillations back to the original signal as additional information. In this way, details of the original signal are overlaid and rendered unrecognisable. The music loses spatial quality and transparency. This process is prevented by vacuum impregnation.

In vacuum impregnation, the coil is first impregnated with a special lacquer under vacuum. Because of the vacuum, this lacquer flows right into the innermost windings. The lacquer is subsequently dried in an oven at 130 °C. Thus the whole coil is baked into a very solid unit. The individual windings are prevented from vibrating and the original signal remains uncorrupted.

additional charge for vacuum impregnation     EUR 19,50 excl. VAT: € 16.81 / $ 19.67 per coil

Mundorf-Spulen Zero Ohm coil N250 with 2.5 mm wire


Product ID L/mH R/Ohm Wire-
D/mm
Pmax*)
8Ohm
Coil Size
(DxH/mm)
Price
M-n250-39 3.9 0.03 2.5   96x73x76 EUR 131,60 excl. VAT: € 113.45 / $ 132.73
M-n250-47 4.7 0.05 2.5   96x73x76 EUR 136,47 excl. VAT: € 117.65 / $ 137.65
M-n250-56 5.6 0.07 2.5   96x73x76 EUR 140,37 excl. VAT: € 121.01 / $ 141.58
M-n250-68 6.8 0.10 2.5   106x78x88 EUR 145,24 excl. VAT: € 125.21 / $ 146.49
M-n250-82 8.2 0.10 2.5   106x78x88 EUR 150,12 excl. VAT: € 129.41 / $ 151.41
M-n250-100 10.0 0.10 2.5   106x78x88 EUR 154,99 excl. VAT: € 133.61 / $ 156.33
M-n250-120 12.0 0.14 2.5   130x95x105 EUR 226,15 excl. VAT: € 194.96 / $ 228.10
M-n250-150 15.0 0.14 2.5   130x95x105 EUR 231,03 excl. VAT: € 199.16 / $ 233.02
M-n250-180 18.0 0.14 2.5   130x95x105 EUR 235,90 excl. VAT: € 203.36 / $ 237.93
M-n250-220 22.0 0.21 2.5   130x95x105 EUR 239,80 excl. VAT: € 206.72 / $ 241.87
M-n250-270 27.0 0.21 2.5   130x95x105 EUR 244,67 excl. VAT: € 210.92 / $ 246.78
M-n250-330 33.0 0.22 2.5   130x95x105 EUR 254,42 excl. VAT: € 219.33 / $ 256.61
*) Pmax 8 Ohm is the maximum power that this coil is able to deliver to the bass driver.
The values are valid for free air convection and 20°C. For 4 Ohm speakers this value has to be halved.
Transformer Coils BT100 BT125 BT140 T200 T250 T300 cfc CFT Zero-Ohm-Coil (ZOC) N250 N300 N390 cfc CFN SFN SGFN  

 

Mundorf-Spulen Zero Ohm coil N300 with 3.0 mm wire

Baked varnish coils are only available with winding diameters from 0.71mm - 1.40mm. These series are identified with a "B" prefix.

Beside the baked varnish air coil we offer vacuum impregnated coils.

additional charge for vacuum impregnation     EUR 19,50 excl. VAT: € 16.81 / $ 19.67 per coil

 

Product ID L/mH R/Ohm Wire-
D/mm
Pmax*)
8Ohm
Coil Size
(DxH/mm)
Price
M-n300-10 1.0 0.02 3.0   96x73x76 EUR 136,47 excl. VAT: € 117.65 / $ 137.65
M-n300-12 1.2 0.03 3.0   96x73x76 EUR 133,55 excl. VAT: € 115.13 / $ 134.70
M-n300-15 1.5 0.03 3.0   96x73x76 EUR 135,50 excl. VAT: € 116.81 / $ 136.67
M-n300-18 1.8 0.03 3.0   96x73x76 EUR 137,45 excl. VAT: € 118.49 / $ 138.63
M-n300-20 2.0 0.03 3.0   96x73x76 EUR 139,39 excl. VAT: € 120.16 / $ 140.59
M-n300-22 2.2 0.03 3.0   96x73x76 EUR 141,34 excl. VAT: € 121.84 / $ 142.56
M-n300-27 2.7 0.03 3.0   96x73x76 EUR 160,55 excl. VAT: € 138.41 / $ 161.93
M-n300-30 3.0 0.04 3.0   96x73x76 EUR 162,50 excl. VAT: € 140.09 / $ 163.90
M-n300-33 3.3 0.04 3.0   96x73x76 EUR 164,45 excl. VAT: € 141.77 / $ 165.87
M-n300-39 3.9 0.05 3.0   106x78x88 EUR 166,35 excl. VAT: € 143.41 / $ 167.78
M-n300-47 4.7 0.05 3.0   106x78x88 EUR 169,27 excl. VAT: € 145.92 / $ 170.73
M-n300-56 5.6 0.05 3.0   106x78x88 EUR 218,35 excl. VAT: € 188.23 / $ 220.23
M-n300-68 6.8 0.06 3.0   130x95x105 EUR 226,15 excl. VAT: € 194.96 / $ 228.10
M-n300-82 8.2 0.06 3.0   130x95x105 EUR 235,56 excl. VAT: € 203.07 / $ 237.59
M-n300-100 10.0 0.07 3.0   130x95x105 EUR 240,77 excl. VAT: € 207.56 / $ 242.85
M-n300-120 12.0 0.08 3.0   130x95x105 EUR 254,42 excl. VAT: € 219.33 / $ 256.61
M-n300-150 15.0 0.09 3.0   130x95x105 EUR 264,17 excl. VAT: € 227.73 / $ 266.45
M-n300-180 18.0 0.10 3.0   130x95x105 EUR 273,92 excl. VAT: € 236.14 / $ 276.28
M-n300-220 22.0 0.12 3.0   150x111x107 EUR 358,72 excl. VAT: € 309.24 / $ 361.81
M-n300-270 27.0 0.14 3.0   150x111x107 EUR 368,47 excl. VAT: € 317.65 / $ 371.65
M-n300-330 33.0 0.14 3.0   150x111x107 EUR 377,24 excl. VAT: € 325.21 / $ 380.49
*) Pmax 8 Ohm is the maximum power that this coil is able to deliver to the bass driver.
The values are valid for free air convection and 20°C. For 4 Ohm speakers this value has to be halved.
Transformer Coils BT100 BT125 BT140 T200 T250 T300 cfc CFT Zero-Ohm-Coil (ZOC) N250 N300 N390 cfc CFN SFN SGFN  

 

Mundorf-Spulen Zero Ohm coil N390 with 2 x 6 mm wire

Baked varnish coils are only available with winding diameters from 0.71mm - 1.40mm. These series are identified with a "B" prefix.

Beside the baked varnish air coil we offer vacuum impregnated coils.

additional charge for vacuum impregnation     EUR 19,50 excl. VAT: € 16.81 / $ 19.67 per coil

 

Product ID L/mH R/Ohm Wire-
D/mm
Pmax*)
8Ohm
Coil Size
(DxH/mm)
Price
M-n390-10 1.0 0.02 6x2   106x78x88 EUR 192,03 excl. VAT: € 165.54 / $ 193.69
M-n390-12 1.2 0.02 6x2   106x78x88 EUR 192,03 excl. VAT: € 165.54 / $ 193.69
M-n390-15 1.5 0.02 6x2   106x78x88 EUR 193,01 excl. VAT: € 166.39 / $ 194.67
M-n390-18 1.8 0.02 6x2   106x78x88 EUR 193,98 excl. VAT: € 167.22 / $ 195.65
M-n390-20 2.0 0.02 6x2   106x78x88 EUR 194,96 excl. VAT: € 168.07 / $ 196.64
M-n390-22 2.2 0.02 6x2   106x78x88 EUR 193,01 excl. VAT: € 166.39 / $ 194.67
M-n390-27 2.7 0.02 6x2   106x78x88 EUR 197,88 excl. VAT: € 170.59 / $ 199.59
M-n390-30 3.0 0.02 6x2   106x78x88 EUR 246,33 excl. VAT: € 212.35 / $ 248.45
M-n390-33 3.3 0.02 6x2   106x78x88 EUR 256,13 excl. VAT: € 220.80 / $ 258.34
M-n390-39 3.9 0.04 6x2   130x95x105 EUR 263,88 excl. VAT: € 227.48 / $ 266.15
M-n390-47 4.7 0.04 6x2   130x95x105 EUR 272,60 excl. VAT: € 235.00 / $ 274.95
M-n390-56 5.6 0.04 6x2   130x95x105 EUR 282,35 excl. VAT: € 243.41 / $ 284.78
M-n390-68 6.8 0.04 6x2   130x95x105 EUR 340,59 excl. VAT: € 293.61 / $ 343.53
M-n390-82 8.2 0.04 6x2   130x95x105 EUR 350,39 excl. VAT: € 302.06 / $ 353.41
M-n390-100 10.0 0.05 6x2   150x111x107 EUR 358,09 excl. VAT: € 308.70 / $ 361.18
M-n390-120 12.0 0.05 6x2   150x111x107 EUR 367,84 excl. VAT: € 317.10 / $ 371.01
M-n390-150 15.0 0.05 6x2   150x111x107 EUR 377,58 excl. VAT: € 325.50 / $ 380.84
M-n390-180 18.0 0.05 6x2   150x111x107 EUR 386,02 excl. VAT: € 332.78 / $ 389.35
M-n390-220 22.0 0.05 6x2   150x111x107 EUR 395,76 excl. VAT: € 341.17 / $ 399.17
*) Pmax 8 Ohm is the maximum power that this coil is able to deliver to the bass driver.
The values are valid for free air convection and 20°C. For 4 Ohm speakers this value has to be halved.
Transformer Coils BT100 BT125 BT140 T200 T250 T300 cfc CFT Zero-Ohm-Coil (ZOC) N250 N300 N390 cfc CFN SFN SGFN  

 
Null Ohm mit cfc Wickel

Mundorf-Spulen Zero Ohm coil CFN with copper foil

Mundorf also delivers Zero Ohm coils with copper foil produced in its own factory. It is extremely pure, and it has a special crystal lattice structure. The outstanding audio characteristics of this precious material are further enhanced by the electrical benefits of the coil design: In contrast to conventional coils, where the individual turns of the windings lie side by side, the windings in these units are directly on top of one another, bringing them significantly closer to the theoretically ideal coil.

CFC-OFC coils are available in four diameters from AWG 10 to AWG 16 (corresponds to round wire with diameters of 1.25 to 2.6mm).

Product ID L/mH R/Ohm Wire-
D/mm
Pmax*)
8Ohm
Coil Size
(DxH/mm)
Price
M-cfn14-27 2.7 0.15 28x0.075   84x60x60 EUR 94,16 excl. VAT: € 81.17 / $ 94.97
M-cfn14-33 3.3 0.15 28x0.075   84x60x60 EUR 98,45 excl. VAT: € 84.87 / $ 99.30
M-cfn14-39 3.9 0.18 28x0.075   84x60x60 EUR 100,40 excl. VAT: € 86.55 / $ 101.27
M-cfn14-47 4.7 0.18 28x0.075   84x60x60 EUR 102,35 excl. VAT: € 88.23 / $ 103.23
M-cfn14-56 5.6 0.18 28x0.075   84x60x60 EUR 104,30 excl. VAT: € 89.91 / $ 105.20
M-cfn14-68 6.8 0.18 28x0.075   84x60x60 EUR 105,28 excl. VAT: € 90.76 / $ 106.19
M-cfn12-82 8.2 0.21 44x0.075   106x78x88 EUR 173,51 excl. VAT: € 149.58 / $ 175.01
M-cfn12-100 10.0 0.21 44x0.075   106x78x88 EUR 173,51 excl. VAT: € 149.58 / $ 175.01
M-cfn12-120 12.0 0.25 44x0.075   106x78x88 EUR 178,39 excl. VAT: € 153.78 / $ 179.93
M-cfn12-150 15.0 0.25 44x0.075   106x78x88 EUR 183,26 excl. VAT: € 157.98 / $ 184.84
M-cfn12-180 18.0 0.25 44x0.075   106x78x88 EUR 188,13 excl. VAT: € 162.18 / $ 189.75
M-cfn12-220 22.0 0.25 44x0.075   106x78x88 EUR 194,96 excl. VAT: € 168.07 / $ 196.64
M-cfn12-270 27.0 0.25 44x0.075   106x78x88 EUR 201,78 excl. VAT: € 173.95 / $ 203.52
*) Pmax 8 Ohm is the maximum power that this coil is able to deliver to the bass driver.
The values are valid for free air convection and 20°C. For 4 Ohm speakers this value has to be halved.
Transformer Coils BT100 BT125 BT140 T200 T250 T300 cfc CFT Zero-Ohm-Coil (ZOC) N250 N300 N390 cfc CFN SFN SGFN  

 

Mundorf-Spulen Zero Ohm coil SFN with silver foil

The advantages of foil coils are easy to explain: In comparison with other forms of construction, the slightest vibrations are clearly measured during the operation with foil coils. In practical terms, this means: The slightest possible signal distortions through any microphonic effects.

Mundorf now offers coils made of pure silver foil or of silver/gold foil. As everybody knows, pure silver conductors are highly valued by many audio enthusiasts due to their superior ability to reproduce voices and instruments in their timbres in an extremely differentiated and neutral manner, and - if possible - are preferable to copper conductors. Silver/gold foil - Mundorfs state of the art foil - ultimately combines the entire variety of multifaceted timbres with the natural, tonal warmth of gold.

Foil coils are available in different diameters from AWG 10 to AWG 16 (corresponds to round wire with diameters of 1.25 to 2.6mm). The coil below is AWG14 with 2.08 mm².

Product ID L/mH R/Ohm Wire-
D/mm
Pmax*)
8Ohm
Coil Size
(DxH/mm)
Price
M-sfn14-27 2.7 0.14 28x0.075   84x60x60 EUR 1687,36 excl. VAT: € 1454.62 / $ 1701.91
M-sfn14-33 3.3 0.14 28x0.075   84x60x60 EUR 1687,36 excl. VAT: € 1454.62 / $ 1701.91
M-sfn14-39 3.9 0.17 28x0.075   84x60x60 EUR 2294,66 excl. VAT: € 1978.16 / $ 2314.44
M-sfn14-47 4.7 0.17 28x0.075   84x60x60 EUR 2294,66 excl. VAT: € 1978.16 / $ 2314.44
M-sfn14-56 5.6 0.17 28x0.075   84x60x60 EUR 2294,66 excl. VAT: € 1978.16 / $ 2314.44
M-sfn14-68 6.8 0.17 28x0.075   84x60x60 EUR 2294,66 excl. VAT: € 1978.16 / $ 2314.44
*) Pmax 8 Ohm is the maximum power that this coil is able to deliver to the bass driver.
The values are valid for free air convection and 20°C. For 4 Ohm speakers this value has to be halved.
Transformer Coils BT100 BT125 BT140 T200 T250 T300 cfc CFT Zero-Ohm-Coil (ZOC) N250 N300 N390 cfc CFN SFN SGFN  

 

Mundorf-Spulen Zero Ohm coil SGFN with Silver/Gold foil

Foil coils are available in different diameters from AWG 10 to AWG 16 (corresponds to round wire with diameters of 1.25 to 2.6mm). The coil below is AWG14 with 2.08 mm².
 
Product ID L/mH R/Ohm Wire-
D/mm
Pmax*)
8Ohm
Coil Size
(DxH/mm)
Price
M-sgfn14-27 2.7 0.14 28x0.075   84x60x60 EUR 2757,68 excl. VAT: € 2377.31 / $ 2781.45
M-sgfn14-33 3.3 0.14 28x0.075   84x60x60 EUR 2757,68 excl. VAT: € 2377.31 / $ 2781.45
M-sgfn14-39 3.9 0.17 28x0.075   84x60x60 EUR 3356,20 excl. VAT: € 2893.28 / $ 3385.13
M-sgfn14-47 4.7 0.17 28x0.075   84x60x60 EUR 3356,20 excl. VAT: € 2893.28 / $ 3385.13
M-sgfn14-56 5.6 0.17 28x0.075   84x60x60 EUR 3356,20 excl. VAT: € 2893.28 / $ 3385.13
M-sgfn14-68 6.8 0.17 28x0.075   84x60x60 EUR 3356,20 excl. VAT: € 2893.28 / $ 3385.13
*) Pmax 8 Ohm is the maximum power that this coil is able to deliver to the bass driver.
The values are valid for free air convection and 20°C. For 4 Ohm speakers this value has to be halved.
Transformer Coils BT100 BT125 BT140 T200 T250 T300 cfc CFT Zero-Ohm-Coil (ZOC) N250 N300 N390 cfc CFN SFN SGFN  

 
Coils overview
Mundorf coils Properties
Air core coils good price/performance ratio; low distortion
Baked varnish air core coils good price/performance ratio; low distortion
Copper foil coil (cfc) with excellent three-dimensionality and attention to detail; they belong to the group of exceptionally neutral .
Air-core coils made from silver/gold wire
Ferrit core coils good price/performance ratio; high inductivity
H Core Coils small impedance; high power handling
Aronit core coils
Feron i core coils small impedance; very high power handling
Zero Ohm Coils very small impedance; very high power handling