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 20,00 excl. VAT: € 16.81 / $ 19.50 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 49,90 excl. VAT: € 41.93 / $ 48.64
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 51,90 excl. VAT: € 43.61 / $ 50.59
M-bt100-180 18.0 1.0 1.00 75 W 84x60x60 EUR 52,90 excl. VAT: € 44.45 / $ 51.57
M-bt100-220 22.0 1.1 1.00 74 W 84x60x60 EUR 53,90 excl. VAT: € 45.29 / $ 52.54
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 - not available
M-bt125-47 4.7 0.31 1.25 236 W 84x60x60 EUR 68,90 excl. VAT: € 57.90 / $ 67.16
*) 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 48,35 excl. VAT: € 40.63 / $ 47.13
M-bt140-12 1.2 0.08 1.4 728 W 84x60x60 EUR 49,35 excl. VAT: € 41.47 / $ 48.11
M-bt140-15 1.5 0.09 1.4 721 W 84x60x60 EUR 49,90 excl. VAT: € 41.93 / $ 48.64
M-bt140-18 1.8 0.10 1.4 682 W 84x60x60 EUR 62,90 excl. VAT: € 52.86 / $ 61.31
M-bt140-20 2.0 0.11 1.4 665 W 84x60x60 EUR 63,90 excl. VAT: € 53.70 / $ 62.29
M-bt140-22 2.2 0.12 1.4 651 W 84x60x60 EUR 64,90 excl. VAT: € 54.54 / $ 63.26
M-bt140-27 2.7 0.17 1.4 499 W 84x60x60 EUR 65,90 excl. VAT: € 55.38 / $ 64.24
M-bt140-30 3.0 0.19 1.4 464 W 84x60x60 EUR 66,90 excl. VAT: € 56.22 / $ 65.21
M-bt140-33 3.3 0.22 1.4 412 W 84x60x60 EUR 67,90 excl. VAT: € 57.06 / $ 66.19
M-bt140-39 3.9 0.25 1.4 439 W 96x73x76 EUR 84,90 excl. VAT: € 71.34 / $ 82.76
M-bt140-47 4.7 0.27 1.4 427 W 96x73x76 EUR 85,90 excl. VAT: € 72.18 / $ 83.73
M-bt140-56 5.6 0.30 1.4 402 W 96x73x76 EUR 86,90 excl. VAT: € 73.03 / $ 84.71
M-bt140-68 6.8 0.32 1.4 394 W 96x73x76 EUR 87,90 excl. VAT: € 73.87 / $ 85.68
M-bt140-82 8.2 0.35 1.4 376 W 96x73x76 EUR 88,90 excl. VAT: € 74.71 / $ 86.66
M-bt140-100 10.0 0.39 1.4 359 W 96x73x76 EUR 89,90 excl. VAT: € 75.55 / $ 87.63
M-bt140-120 12.0 0.45 1.4 332 W 96x73x76 EUR 91,90 excl. VAT: € 77.23 / $ 89.58
*) 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 20,00 excl. VAT: € 16.81 / $ 19.50 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 48,95 excl. VAT: € 41.13 / $ 47.72
M-t200-056 0.56 0.05 2.0 1297 W 84x60x60 EUR 49,35 excl. VAT: € 41.47 / $ 48.11
M-t200-068 0.68 0.06 2.0 1136 W 84x60x60 EUR 49,95 excl. VAT: € 41.97 / $ 48.69
M-t200-082 0.82 0.06 2.0 1220 W 84x60x60 EUR 50,10 excl. VAT: € 42.10 / $ 48.84
M-t200-10 1.0 0.07 2.0 1117 W 84x60x60 EUR 72,90 excl. VAT: € 61.26 / $ 71.06
M-t200-12 1.2 0.08 2.0 1060 W 84x60x60 EUR 75,90 excl. VAT: € 63.78 / $ 73.99
M-t200-15 1.5 0.09 2.0 1007 W 84x60x60 EUR 77,90 excl. VAT: € 65.46 / $ 75.94
M-t200-18 1.8 0.08 2.0 1406 W 96x73x76 EUR 86,90 excl. VAT: € 73.03 / $ 84.71
M-t200-20 2.0 0.09 2.0 1341 W 96x73x76 EUR 88,90 excl. VAT: € 74.71 / $ 86.66
M-t200-22 2.2 0.09 2.0 1433 W 96x73x76 EUR 90,90 excl. VAT: € 76.39 / $ 88.61
M-t200-27 2.7 0.10 2.0 1399 W 96x73x76 EUR 93,90 excl. VAT: € 78.91 / $ 91.53
M-t200-30 3.0 0.11 2.0 1359 W 96x73x76 EUR 96,90 excl. VAT: € 81.43 / $ 94.46
M-t200-33 3.3 0.10 2.0 903 W 106x78x88 EUR 106,00 excl. VAT: € 89.08 / $ 103.33
M-t200-39 3.9 0.11 2.0 915 W 106x78x88 EUR 109,00 excl. VAT: € 91.60 / $ 106.25
M-t200-47 4.7 0.14 2.0 756 W 106x78x88 EUR 112,00 excl. VAT: € 94.12 / $ 109.18
M-t200-56 5.6 0.15 2.0 757 W 106x78x88 EUR 115,00 excl. VAT: € 96.64 / $ 112.10
M-t200-68 6.8 0.18 2.0 674 W 106x78x88 EUR 117,00 excl. VAT: € 98.32 / $ 114.05
M-t200-82 8.2 0.20 2.0 658 W 106x78x88 EUR 120,00 excl. VAT: € 100.84 / $ 116.97
M-t200-100 10.0 0.22 2.0 639 W 106x78x88 EUR 123,00 excl. VAT: € 103.36 / $ 119.90
M-t200-120 12.0 0.19 2.0 820 W 130x95x105 EUR 154,00 excl. VAT: € 129.41 / $ 150.12
M-t200-150 15.0 0.28 2.0 585 W 130x95x105 EUR 164,00 excl. VAT: € 137.82 / $ 159.87
M-t200-180 18.0 0.33 2.0 533 W 130x95x105 EUR 174,00 excl. VAT: € 146.22 / $ 169.61
M-t200-220 22.0 0.37 2.0 508 W 130x95x105 EUR 184,00 excl. VAT: € 154.62 / $ 179.36
M-t200-270 27.0 0.41 2.0 497 W 130x95x105 EUR 193,00 excl. VAT: € 162.18 / $ 188.13
M-t200-330 33.0 0.48 2.0 454 W 130x95x105 EUR 203,00 excl. VAT: € 170.59 / $ 197.88
M-t200-390 39.0 0.48 2.0 391 W 150x111x107 EUR 251,00 excl. VAT: € 210.92 / $ 244.67
M-t200-470 47.0 0.58 2.0 345 W 150x111x107 EUR 271,00 excl. VAT: € 227.73 / $ 264.17
*) 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  

 

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 20,00 excl. VAT: € 16.81 / $ 19.50 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 96,90 excl. VAT: € 81.43 / $ 94.46
M-t250-12 1.2 0.04 2.5 3223 W 96x73x76 EUR 101,90 excl. VAT: € 85.63 / $ 99.33
M-t250-15 1.5 0.05 2.5 2798 W 96x73x76 EUR 102,90 excl. VAT: € 86.47 / $ 100.31
M-t250-18 1.8 0.05 2.5 2990 W 96x73x76 EUR 106,00 excl. VAT: € 89.08 / $ 103.33
M-t250-20 2.0 0.06 2.5 1677 W 106x78x88 EUR 120,00 excl. VAT: € 100.84 / $ 116.97
M-t250-22 2.2 0.07 2.5 1512 W 106x78x88 EUR 123,00 excl. VAT: € 103.36 / $ 119.90
M-t250-27 2.7 0.07 2.5 1622 W 106x78x88 EUR 126,00 excl. VAT: € 105.88 / $ 122.82
M-t250-30 3.0 0.08 2.5 1516 W 106x78x88 EUR 129,00 excl. VAT: € 108.40 / $ 125.75
M-t250-33 3.3 0.08 2.5 1645 W 106x78x88 EUR 132,00 excl. VAT: € 110.92 / $ 128.67
M-t250-39 3.9 0.09 2.5 1563 W 106x78x88 EUR 135,00 excl. VAT: € 113.45 / $ 131.60
M-t250-47 4.7 0.08 2.5 1948 W 130x95x105 EUR 175,00 excl. VAT: € 147.06 / $ 170.59
M-t250-56 5.6 0.09 2.5 1821 W 130x95x105 EUR 184,00 excl. VAT: € 154.62 / $ 179.36
M-t250-68 6.8 0.12 2.5 1465 W 130x95x105 EUR 189,00 excl. VAT: € 158.82 / $ 184.24
M-t250-82 8.2 0.14 2.5 1342 W 130x95x105 EUR 194,00 excl. VAT: € 163.03 / $ 189.11
M-t250-100 10.0 0.16 2.5 1274 W 130x95x105 EUR 199,00 excl. VAT: € 167.23 / $ 193.98
M-t250-120 12.0 0.19 2.5 1146 W 130x95x105 EUR 203,00 excl. VAT: € 170.59 / $ 197.88
M-t250-150 15.0 0.17 2.5 977 W 150x111x107 EUR 242,00 excl. VAT: € 203.36 / $ 235.90
M-t250-180 18.0 0.22 2.5 794 W 150x111x107 EUR 256,00 excl. VAT: € 215.13 / $ 249.55
M-t250-220 22.0 0.25 2.5 750 W 150x111x107 EUR 271,00 excl. VAT: € 227.73 / $ 264.17
*) 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  

 

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 20,00 excl. VAT: € 16.81 / $ 19.50 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 125,00 excl. VAT: € 105.04 / $ 121.85
M-t300-12 1.2 0.03 3.0 4043 W 106x78x88 EUR 130,00 excl. VAT: € 109.24 / $ 126.72
M-t300-15 1.5 0.04 3.0 3290 W 106x78x88 EUR 135,00 excl. VAT: € 113.45 / $ 131.60
M-t300-18 1.8 0.04 3.0 3516 W 106x78x88 EUR 140,00 excl. VAT: € 117.65 / $ 136.47
M-t300-20 2.0 0.05 3.0 2638 W 130x95x105 EUR 174,00 excl. VAT: € 146.22 / $ 169.61
M-t300-22 2.2 0.05 3.0 2877 W 130x95x105 EUR 179,00 excl. VAT: € 150.42 / $ 174.49
M-t300-27 2.7 0.07 3.0 2226 W 130x95x105 EUR 183,00 excl. VAT: € 153.78 / $ 178.39
M-t300-30 3.0 0.06 3.0 2731 W 130x95x105 EUR 188,00 excl. VAT: € 157.98 / $ 183.26
M-t300-33 3.3 0.06 3.0 2931 W 130x95x105 EUR 193,00 excl. VAT: € 162.18 / $ 188.13
M-t300-39 3.9 0.07 3.0 2683 W 130x95x105 EUR 198,00 excl. VAT: € 166.39 / $ 193.01
M-t300-47 4.7 0.07 3.0 2912 W 130x95x105 EUR 203,00 excl. VAT: € 170.59 / $ 197.88
M-t300-56 5.6 0.09 3.0 2420 W 130x95x105 EUR 213,00 excl. VAT: € 178.99 / $ 207.63
M-t300-68 6.8 0.10 3.0 1662 W 150x111x107 EUR 271,00 excl. VAT: € 227.73 / $ 264.17
M-t300-82 8.2 0.10 3.0 1747 W 150x111x107 EUR 280,00 excl. VAT: € 235.29 / $ 272.94
M-t300-100 10.0 0.12 3.0 1562 W 150x111x107 EUR 290,00 excl. VAT: € 243.70 / $ 282.69
M-t300-120 12.0 0.13 3.0 1540 W 150x111x107 EUR 300,00 excl. VAT: € 252.10 / $ 292.44
M-t300-150 15.0 0.15 3.0 1449 W 150x111x107 EUR 310,00 excl. VAT: € 260.50 / $ 302.18
*) 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 56,90 excl. VAT: € 47.82 / $ 55.47
M-cft12-27 2.7 0.13 44x0.075 695 W 106x78x88 EUR 120,00 excl. VAT: € 100.84 / $ 116.97
M-cft12-33 3.3 0.15 44x0.075 645 W 106x78x88 EUR 130,00 excl. VAT: € 109.24 / $ 126.72
M-cft12-39 3.9 0.17 44x0.075 607 W 106x78x88 EUR 135,00 excl. VAT: € 113.45 / $ 131.60
M-cft12-47 4.7 0.19 44x0.075 577 W 106x78x88 EUR 145,00 excl. VAT: € 121.85 / $ 141.34
M-cft12-56 5.6 0.21 44x0.075 553 W 106x78x88 EUR 154,00 excl. VAT: € 129.41 / $ 150.12
M-cft12-68 6.8 0.22 44x0.075 557 W 106x78x88 EUR 164,00 excl. VAT: € 137.82 / $ 159.87
*) 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 20,00 excl. VAT: € 16.81 / $ 19.50 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 135,00 excl. VAT: € 113.45 / $ 131.60
M-n250-47 4.7 0.05 2.5   96x73x76 EUR 140,00 excl. VAT: € 117.65 / $ 136.47
M-n250-56 5.6 0.07 2.5   96x73x76 EUR 144,00 excl. VAT: € 121.01 / $ 140.37
M-n250-68 6.8 0.10 2.5   106x78x88 EUR 149,00 excl. VAT: € 125.21 / $ 145.24
M-n250-82 8.2 0.10 2.5   106x78x88 EUR 154,00 excl. VAT: € 129.41 / $ 150.12
M-n250-100 10.0 0.10 2.5   106x78x88 EUR 159,00 excl. VAT: € 133.61 / $ 154.99
M-n250-120 12.0 0.14 2.5   130x95x105 EUR 232,00 excl. VAT: € 194.96 / $ 226.15
M-n250-150 15.0 0.14 2.5   130x95x105 EUR 237,00 excl. VAT: € 199.16 / $ 231.03
M-n250-180 18.0 0.14 2.5   130x95x105 EUR 242,00 excl. VAT: € 203.36 / $ 235.90
M-n250-220 22.0 0.21 2.5   130x95x105 EUR 246,00 excl. VAT: € 206.72 / $ 239.80
M-n250-270 27.0 0.21 2.5   130x95x105 EUR 251,00 excl. VAT: € 210.92 / $ 244.67
M-n250-330 33.0 0.22 2.5   130x95x105 EUR 261,00 excl. VAT: € 219.33 / $ 254.42
*) 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 20,00 excl. VAT: € 16.81 / $ 19.50 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 140,00 excl. VAT: € 117.65 / $ 136.47
M-n300-12 1.2 0.03 3.0   96x73x76 EUR 142,00 excl. VAT: € 119.33 / $ 138.42
M-n300-15 1.5 0.03 3.0   96x73x76 EUR 144,00 excl. VAT: € 121.01 / $ 140.37
M-n300-18 1.8 0.03 3.0   96x73x76 EUR 146,00 excl. VAT: € 122.69 / $ 142.32
M-n300-20 2.0 0.03 3.0   96x73x76 EUR 148,00 excl. VAT: € 124.37 / $ 144.27
M-n300-22 2.2 0.03 3.0   96x73x76 EUR 150,00 excl. VAT: € 126.05 / $ 146.22
M-n300-27 2.7 0.03 3.0   96x73x76 EUR 155,00 excl. VAT: € 130.25 / $ 151.09
M-n300-30 3.0 0.04 3.0   96x73x76 EUR 157,00 excl. VAT: € 131.93 / $ 153.04
M-n300-33 3.3 0.04 3.0   96x73x76 EUR 159,00 excl. VAT: € 133.61 / $ 154.99
M-n300-39 3.9 0.05 3.0   106x78x88 EUR 161,00 excl. VAT: € 135.29 / $ 156.94
M-n300-47 4.7 0.05 3.0   106x78x88 EUR 164,00 excl. VAT: € 137.82 / $ 159.87
M-n300-56 5.6 0.05 3.0   106x78x88 EUR 224,00 excl. VAT: € 188.24 / $ 218.35
M-n300-68 6.8 0.06 3.0   130x95x105 EUR 227,00 excl. VAT: € 190.76 / $ 221.28
M-n300-82 8.2 0.06 3.0   130x95x105 EUR 232,00 excl. VAT: € 194.96 / $ 226.15
M-n300-100 10.0 0.07 3.0   130x95x105 EUR 242,00 excl. VAT: € 203.36 / $ 235.90
M-n300-120 12.0 0.08 3.0   130x95x105 EUR 251,00 excl. VAT: € 210.92 / $ 244.67
M-n300-150 15.0 0.09 3.0   130x95x105 EUR 261,00 excl. VAT: € 219.33 / $ 254.42
M-n300-180 18.0 0.10 3.0   130x95x105 EUR 271,00 excl. VAT: € 227.73 / $ 264.17
M-n300-220 22.0 0.12 3.0   150x111x107 EUR 349,00 excl. VAT: € 293.28 / $ 340.20
M-n300-270 27.0 0.14 3.0   150x111x107 EUR 359,00 excl. VAT: € 301.68 / $ 349.95
M-n300-330 33.0 0.14 3.0   150x111x107 EUR 368,00 excl. VAT: € 309.24 / $ 358.72
*) 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 20,00 excl. VAT: € 16.81 / $ 19.50 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 174,00 excl. VAT: € 146.22 / $ 169.61
M-n390-12 1.2 0.02 6x2   106x78x88 EUR 175,00 excl. VAT: € 147.06 / $ 170.59
M-n390-15 1.5 0.02 6x2   106x78x88 EUR 177,00 excl. VAT: € 148.74 / $ 172.54
M-n390-18 1.8 0.02 6x2   106x78x88 EUR 180,00 excl. VAT: € 151.26 / $ 175.46
M-n390-20 2.0 0.02 6x2   106x78x88 EUR 183,00 excl. VAT: € 153.78 / $ 178.39
M-n390-22 2.2 0.02 6x2   106x78x88 EUR 188,00 excl. VAT: € 157.98 / $ 183.26
M-n390-27 2.7 0.02 6x2   106x78x88 EUR 193,00 excl. VAT: € 162.18 / $ 188.13
M-n390-30 3.0 0.02 6x2   106x78x88 EUR 243,00 excl. VAT: € 204.20 / $ 236.87
M-n390-33 3.3 0.02 6x2   106x78x88 EUR 253,00 excl. VAT: € 212.61 / $ 246.62
M-n390-39 3.9 0.04 6x2   130x95x105 EUR 261,00 excl. VAT: € 219.33 / $ 254.42
M-n390-47 4.7 0.04 6x2   130x95x105 EUR 270,00 excl. VAT: € 226.89 / $ 263.19
M-n390-56 5.6 0.04 6x2   130x95x105 EUR 280,00 excl. VAT: € 235.29 / $ 272.94
M-n390-68 6.8 0.04 6x2   130x95x105 EUR 330,00 excl. VAT: € 277.31 / $ 321.68
M-n390-82 8.2 0.04 6x2   130x95x105 EUR 340,00 excl. VAT: € 285.71 / $ 331.43
M-n390-100 10.0 0.05 6x2   150x111x107 EUR 348,00 excl. VAT: € 292.44 / $ 339.23
M-n390-120 12.0 0.05 6x2   150x111x107 EUR 358,00 excl. VAT: € 300.84 / $ 348.97
M-n390-150 15.0 0.05 6x2   150x111x107 EUR 368,00 excl. VAT: € 309.24 / $ 358.72
M-n390-180 18.0 0.05 6x2   150x111x107 EUR 377,00 excl. VAT: € 316.81 / $ 367.50
M-n390-220 22.0 0.05 6x2   150x111x107 EUR 387,00 excl. VAT: € 325.21 / $ 377.24
*) 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 88,90 excl. VAT: € 74.71 / $ 86.66
M-cfn14-33 3.3 0.15 28x0.075   84x60x60 EUR 92,90 excl. VAT: € 78.07 / $ 90.56
M-cfn14-39 3.9 0.18 28x0.075   84x60x60 EUR 94,90 excl. VAT: € 79.75 / $ 92.51
M-cfn14-47 4.7 0.18 28x0.075   84x60x60 EUR 96,90 excl. VAT: € 81.43 / $ 94.46
M-cfn14-56 5.6 0.18 28x0.075   84x60x60 EUR 98,90 excl. VAT: € 83.11 / $ 96.41
M-cfn14-68 6.8 0.18 28x0.075   84x60x60 EUR 101,00 excl. VAT: € 84.87 / $ 98.45
M-cfn12-82 8.2 0.21 44x0.075   106x78x88 EUR 159,00 excl. VAT: € 133.61 / $ 154.99
M-cfn12-100 10.0 0.21 44x0.075   106x78x88 EUR 164,00 excl. VAT: € 137.82 / $ 159.87
M-cfn12-120 12.0 0.25 44x0.075   106x78x88 EUR 169,00 excl. VAT: € 142.02 / $ 164.74
M-cfn12-150 15.0 0.25 44x0.075   106x78x88 EUR 174,00 excl. VAT: € 146.22 / $ 169.61
M-cfn12-180 18.0 0.25 44x0.075   106x78x88 EUR 178,00 excl. VAT: € 149.58 / $ 173.51
M-cfn12-220 22.0 0.25 44x0.075   106x78x88 EUR 183,00 excl. VAT: € 153.78 / $ 178.39
M-cfn12-270 27.0 0.25 44x0.075   106x78x88 EUR 188,00 excl. VAT: € 157.98 / $ 183.26
*) 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 1731,00 excl. VAT: € 1454.62 / $ 1687.36
M-sfn14-33 3.3 0.14 28x0.075   84x60x60 EUR 1731,00 excl. VAT: € 1454.62 / $ 1687.36
M-sfn14-39 3.9 0.17 28x0.075   84x60x60 EUR 2354,00 excl. VAT: € 1978.15 / $ 2294.66
M-sfn14-47 4.7 0.17 28x0.075   84x60x60 EUR 2354,00 excl. VAT: € 1978.15 / $ 2294.66
M-sfn14-56 5.6 0.17 28x0.075   84x60x60 EUR 2354,00 excl. VAT: € 1978.15 / $ 2294.66
M-sfn14-68 6.8 0.17 28x0.075   84x60x60 EUR 2354,00 excl. VAT: € 1978.15 / $ 2294.66
*) 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 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 2829,00 excl. VAT: € 2377.31 / $ 2757.68
M-sgfn14-33 3.3 0.14 28x0.075   84x60x60 EUR 2829,00 excl. VAT: € 2377.31 / $ 2757.68
M-sgfn14-39 3.9 0.17 28x0.075   84x60x60 EUR 3443,00 excl. VAT: € 2893.28 / $ 3356.20
M-sgfn14-47 4.7 0.17 28x0.075   84x60x60 EUR 3443,00 excl. VAT: € 2893.28 / $ 3356.20
M-sgfn14-56 5.6 0.17 28x0.075   84x60x60 EUR 3443,00 excl. VAT: € 2893.28 / $ 3356.20
M-sgfn14-68 6.8 0.17 28x0.075   84x60x60 EUR 3443,00 excl. VAT: € 2893.28 / $ 3356.20
*) 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