Loudspeaker components Loudspeaker
components
Coils Introduction Coils
Introduction
Coils sorted by inductivity Coils sorted
by inductivity
Audaphon coils Audaphon
coils
Mundorf air coil Mundorf
air coil
Baked varnish air coil Baked varnish
air coil
Hepta Strand coil Hepta
Strand coil
Mundorf CFC coil Mundorf
CFC coil
Mundorf VLCU coil Mundorf
VLCU coil
Silver/gold air coils Silver/gold
air coils
Aronit / P core coil Aronit / P
core coil
Drum / H core coil Drum / H
core coil
i-core coil/ BS coil i-core coil/
BS coil
Transformer core coil Transformer
core coil
Zero Ohm Coil Zero Ohm
Coil
Duelund coils Duelund
coils
Jantzen Wax coils Jantzen Wax
coils
Visaton coils Visaton
coils
more infos on coils more infos
on coils
Coilcalculator Coil-
calculator

T200 T300 Baked varnish BT140 vakuum impregnated VT125 VT140 VT180 VT236 VT300 VT390

Mundorf transformer core coils (Mcoil T)

Mundorf transformer core coils (Mcoil T)
Enlarge
For the transformer core coils 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. Coils treated like that start with the letter V, like VT236
 
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: The power values Pmax in the following tables were determined at 20 degrees Celsius ambient temperature and free convection. They are just a guideline and - since we are not the manufacturers - cannot be guaranteed by us.

T200 T300 Baked varnish BT140 vakuum impregnated VT125 VT140 VT180 VT236 VT300 VT390

Standard transformer core coil T200

L denotes inductance, R the DC resistance, D the diameter, Le the length, Wire-W the width of the wire, DxH the diameter and the height.

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 1372 W 84x60x60 EUR 49,20 excl. VAT: € 41.34 / $ 41.34
M-t200-15 1.5 0.07 2.0 1490 W 84x60x60 EUR 77,10 excl. VAT: € 64.79 / $ 64.79
M-t200-82 8.2 0.20 2.0 759 W 106x81x88 EUR 121,00 excl. VAT: € 101.68 / $ 101.68
M-t200-100 10.0 0.23 2.0 704 W 106x81x88 EUR 122,00 excl. VAT: € 102.52 / $ 102.52
M-t200-150 15.0 0.29 2.0 659 W 130x100x106 EUR 162,00 excl. VAT: € 136.13 / $ 136.13
*) 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.

T200 T300 Baked varnish BT140 vakuum impregnated VT125 VT140 VT180 VT236 VT300 VT390

Standard transformer core coil T300

L denotes inductance, R the DC resistance, D the diameter, Le the length, Wire-W the width of the wire, DxH the diameter and the height.

Product ID L/mH R/Ohm Wire-
D/mm
Pmax*)
8Ohm
Coil Size
(DxH/mm)
Price
M-T300-18 1.8 0.04 3.0 5103 W 106x81x88 EUR 132,00 excl. VAT: € 110.92 / $ 110.92
*) 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.

T200 T300 Baked varnish BT140 vakuum impregnated VT125 VT140 VT180 VT236 VT300 VT390

Baked varnish transformer core coil BT140

L denotes inductance, R the DC resistance, D the diameter, Le the length, Wire-W the width of the wire, DxH the diameter and the height.

Product ID L/mH R/Ohm Wire-
D/mm
Pmax*)
8Ohm
Coil Size
(DxH/mm)
Price
M-bt140-33 3.3 0.21 1.4 531 W 84x60x60 EUR 78,30 excl. VAT: € 65.80 / $ 65.80
M-bt140-39 3.9 0.23 1.4 469 W 96x69x77 EUR 94,00 excl. VAT: € 78.99 / $ 78.99
*) 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.

T200 T300 Baked varnish BT140 vakuum impregnated VT125 VT140 VT180 VT236 VT300 VT390

Vacuum impregnated transformer core coil VT125

L denotes inductance, R the DC resistance, D the diameter, Le the length, Wire-W the width of the wire, DxH the diameter and the height.

Product ID L/mH R/Ohm Wire-
D/mm
Pmax*)
8Ohm
Coil Size
(DxH/mm)
Price
M-VT125-39 3.9 0.28 1.25 314 W 84x60x60 EUR 83,20 excl. VAT: € 69.92 / $ 69.92
M-VT125-47 4.7 0.31 1.25 303 W 84x60x60 EUR 84,10 excl. VAT: € 70.67 / $ 70.67
M-VT125-56 5.6 0.34 1.25 293 W 84x60x60 EUR 86,10 excl. VAT: € 72.35 / $ 72.35
M-VT125-68 6.8 0.37 1.25 286 W 84x60x60 EUR 88,10 excl. VAT: € 74.03 / $ 74.03
M-VT125-82 8.2 0.43 1.25 259 W 84x60x60 EUR 90,00 excl. VAT: € 75.63 / $ 75.63
*) 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.

T200 T300 Baked varnish BT140 vakuum impregnated VT125 VT140 VT180 VT236 VT300 VT390

Vacuum impregnated transformer core coil VT140

L denotes inductance, R the DC resistance, D the diameter, Le the length, Wire-W the width of the wire, DxH the diameter and the height.

Product ID L/mH R/Ohm Wire-
D/mm
Pmax*)
8Ohm
Coil Size
(DxH/mm)
Price
M-VT140-10 1.0 0.10 1.4 698 W 66x50x54 EUR 58,70 excl. VAT: € 49.33 / $ 49.33
M-VT140-12 1.2 0.11 1.4 671 W 66x50x54 EUR 60,60 excl. VAT: € 50.92 / $ 50.92
M-VT140-15 1.5 0.12 1.4 650 W 66x50x54 EUR 62,60 excl. VAT: € 52.61 / $ 52.61
M-VT140-18 1.8 0.11 1.4 800 W 84x60x60 EUR 73,40 excl. VAT: € 61.68 / $ 61.68
M-VT140-20 2.0 0.13 1.4 704 W 84x60x60 EUR 70,50 excl. VAT: € 59.24 / $ 59.24
M-VT140-22 2.2 0.15 1.4 626 W 84x60x60 EUR 78,30 excl. VAT: € 65.80 / $ 65.80
M-VT140-27 2.7 0.17 1.4 587 W 84x60x60 EUR 83,20 excl. VAT: € 69.92 / $ 69.92
M-VT140-33 3.3 0.21 1.4 531 W 84x60x60 EUR 88,10 excl. VAT: € 74.03 / $ 74.03
M-VT140-39 3.9 0.23 1.4 469 W 96x69x77 EUR 102,80 excl. VAT: € 86.39 / $ 86.39
M-VT140-47 4.7 0.25 1.4 464 W 96x69x77 EUR 105,70 excl. VAT: € 88.82 / $ 88.82
M-VT140-56 5.6 0.28 1.4 444 W 96x69x77 EUR 108,60 excl. VAT: € 91.26 / $ 91.26
M-VT140-68 6.8 0.32 1.4 415 W 96x69x77 EUR 112,60 excl. VAT: € 94.62 / $ 94.62
M-VT140-82 8.2 0.35 1.4 403 W 96x69x77 EUR 117,50 excl. VAT: € 98.74 / $ 98.74
M-VT140-100 10.0 0.38 1.4 393 W 96x69x77 EUR 122,40 excl. VAT: € 102.86 / $ 102.86
M-VT140-120 12.0 0.45 1.4 350 W 96x69x77 EUR 127,30 excl. VAT: € 106.97 / $ 106.97
*) 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.

T200 T300 Baked varnish BT140 vakuum impregnated VT125 VT140 VT180 VT236 VT300 VT390

Vacuum impregnated transformer core coil VT180

L denotes inductance, R the DC resistance, D the diameter, Le the length, Wire-W the width of the wire, DxH the diameter and the height.

Product ID L/mH R/Ohm Wire-
D/mm
Pmax*)
8Ohm
Coil Size
(DxH/mm)
Price
M-VT180-10 1.0 0.08 1.8 1218 W 84x60x60 EUR 84,10 excl. VAT: € 70.67 / $ 70.67
M-VT180-12 1.2 0.08 1.8 1218 W 84x60x60 EUR 86,10 excl. VAT: € 72.35 / $ 72.35
M-VT180-15 1.5 0.09 1.8 1148 W 84x60x60 EUR 88,10 excl. VAT: € 74.03 / $ 74.03
M-VT180-18 1.8 0.10 1.8 1092 W 84x60x60 EUR 91,00 excl. VAT: € 76.47 / $ 76.47
M-VT180-22 2.2 0.11 1.8 1131 W 96x69x77 EUR 107,70 excl. VAT: € 90.50 / $ 90.50
M-VT180-27 2.7 0.12 1.8 1106 W 96x69x77 EUR 112,60 excl. VAT: € 94.62 / $ 94.62
M-VT180-33 3.3 0.14 1.8 1007 W 96x69x77 EUR 117,50 excl. VAT: € 98.74 / $ 98.74
M-VT180-39 3.9 0.15 1.8 995 W 96x69x77 EUR 122,40 excl. VAT: € 102.86 / $ 102.86
M-VT180-47 4.7 0.17 1.8 927 W 96x69x77 EUR 127,30 excl. VAT: € 106.97 / $ 106.97
M-VT180-56 5.6 0.19 1.8 792 W 106x81x88 EUR 146,90 excl. VAT: € 123.45 / $ 123.45
M-VT180-68 6.8 0.21 1.8 767 W 106x81x88 EUR 151,80 excl. VAT: € 127.56 / $ 127.56
M-VT180-82 8.2 0.25 1.8 688 W 106x81x88 EUR 156,70 excl. VAT: € 131.68 / $ 131.68
M-VT180-100 10.0 0.27 1.8 676 W 106x81x88 EUR 161,60 excl. VAT: € 135.80 / $ 135.80
M-VT180-120 12.0 0.31 1.8 624 W 106x81x88 EUR 166,50 excl. VAT: € 139.92 / $ 139.92
M-VT180-56 5.6 0.36 1.8 567 W 106x81x88 EUR 146,90 excl. VAT: € 123.45 / $ 123.45
M-VT180-68 6.8 0.39 1.8 576 W 130x100x106 EUR 151,80 excl. VAT: € 127.56 / $ 127.56
M-VT180-82 8.2 0.45 1.8 535 W 130x100x106 EUR 156,70 excl. VAT: € 131.68 / $ 131.68
M-VT180-100 10.0 0.50 1.8 513 W 130x100x106 EUR 161,60 excl. VAT: € 135.80 / $ 135.80
M-VT180-120 12.0 0.57 1.8 478 W 130x100x106 EUR 166,50 excl. VAT: € 139.92 / $ 139.92
M-VT180-100 10.0 0.63 1.8 458 W 130x100x106 EUR 161,60 excl. VAT: € 135.80 / $ 135.80
M-VT180-120 12.0 0.71 1.8 429 W 130x100x106 EUR 166,50 excl. VAT: € 139.92 / $ 139.92
*) 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.

T200 T300 Baked varnish BT140 vakuum impregnated VT125 VT140 VT180 VT236 VT300 VT390

Vacuum impregnated transformer core coil VT236

L denotes inductance, R the DC resistance, D the diameter, Le the length, Wire-W the width of the wire, DxH the diameter and the height.

Product ID L/mH R/Ohm Wire-
D/mm
Pmax*)
8Ohm
Coil Size
(DxH/mm)
Price
M-VT236-10 1.0 0.05 2.4 2653 W 96x69x77 EUR 112,60 excl. VAT: € 94.62 / $ 94.62
M-VT236-12 1.2 0.05 2.4 2819 W 96x69x77 EUR 115,50 excl. VAT: € 97.06 / $ 97.06
M-VT236-15 1.5 0.06 2.4 2488 W 96x69x77 EUR 119,40 excl. VAT: € 100.34 / $ 100.34
M-VT236-18 1.8 0.06 2.4 2626 W 96x69x77 EUR 125,30 excl. VAT: € 105.29 / $ 105.29
M-VT236-22 2.2 0.08 2.4 1880 W 106x81x88 EUR 146,90 excl. VAT: € 123.45 / $ 123.45
M-VT236-27 2.7 0.09 2.4 1791 W 106x81x88 EUR 151,80 excl. VAT: € 127.56 / $ 127.56
M-VT236-33 3.3 0.10 2.4 1719 W 106x81x88 EUR 156,70 excl. VAT: € 131.68 / $ 131.68
M-VT236-39 3.9 0.11 2.4 1660 W 106x81x88 EUR 166,50 excl. VAT: € 139.92 / $ 139.92
M-VT236-47 4.7 0.12 2.4 1611 W 106x81x88 EUR 176,30 excl. VAT: € 148.15 / $ 148.15
M-VT236-56 5.6 0.13 2.4 1570 W 106x81x88 EUR 186,10 excl. VAT: € 156.39 / $ 156.39
M-VT236-68 6.8 0.14 2.4 1604 W 130x100x106 EUR 235,10 excl. VAT: € 197.56 / $ 197.56
M-VT236-82 8.2 0.16 2.4 1503 W 130x100x106 EUR 249,80 excl. VAT: € 209.92 / $ 209.92
M-VT236-100 10.0 0.18 2.4 1425 W 130x100x106 EUR 264,50 excl. VAT: € 222.27 / $ 222.27
M-VT236-120 12.0 0.21 2.4 1298 W 130x100x106 EUR 284,10 excl. VAT: € 238.74 / $ 238.74
M-VT236-150 15.0 0.24 2.4 1203 W 130x100x106 EUR 303,70 excl. VAT: € 255.21 / $ 255.21
M-VT236-180 18.0 0.26 2.4 1172 W 130x100x106 EUR 323,30 excl. VAT: € 271.68 / $ 271.68
M-VT236-220 22.0 0.28 2.4 1284 W 150x115x121 EUR 391,90 excl. VAT: € 329.33 / $ 329.33
M-VT236-270 27.0 0.32 2.4 1190 W 150x115x121 EUR 416,40 excl. VAT: € 349.92 / $ 349.92
M-VT236-330 33.0 0.36 2.4 1117 W 150x115x121 EUR 440,90 excl. VAT: € 370.50 / $ 370.50
*) 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.

T200 T300 Baked varnish BT140 vakuum impregnated VT125 VT140 VT180 VT236 VT300 VT390

Vacuum impregnated transformer core coil VT300

L denotes inductance, R the DC resistance, D the diameter, Le the length, Wire-W the width of the wire, DxH the diameter and the height.

Product ID L/mH R/Ohm Wire-
D/mm
Pmax*)
8Ohm
Coil Size
(DxH/mm)
Price
M-VT300-10 1.0 0.03 3.0 5730 W 106x81x88 EUR 142,00 excl. VAT: € 119.33 / $ 119.33
M-VT300-12 1.2 0.03 3.0 6088 W 106x81x88 EUR 146,90 excl. VAT: € 123.45 / $ 123.45
M-VT300-15 1.5 0.04 3.0 4834 W 106x81x88 EUR 156,70 excl. VAT: € 131.68 / $ 131.68
M-VT300-18 1.8 0.04 3.0 5103 W 106x81x88 EUR 166,50 excl. VAT: € 139.92 / $ 139.92
M-VT300-20 2.0 0.05 3.0 4683 W 130x100x106 EUR 189,90 excl. VAT: € 159.58 / $ 159.58
M-VT300-22 2.2 0.05 3.0 4811 W 130x100x106 EUR 225,30 excl. VAT: € 189.33 / $ 189.33
M-VT300-27 2.7 0.07 3.0 3665 W 130x100x106 EUR 235,10 excl. VAT: € 197.56 / $ 197.56
M-VT300-30 3.0 0.06 3.0 4383 W 130x100x106 EUR 204,90 excl. VAT: € 172.18 / $ 172.18
M-VT300-33 3.3 0.06 3.0 4544 W 130x100x106 EUR 244,90 excl. VAT: € 205.80 / $ 205.80
M-VT300-39 3.9 0.07 3.0 4124 W 130x100x106 EUR 259,60 excl. VAT: € 218.15 / $ 218.15
M-VT300-47 4.7 0.07 3.0 4353 W 130x100x106 EUR 274,30 excl. VAT: € 230.50 / $ 230.50
M-VT300-56 5.6 0.09 3.0 3564 W 130x100x106 EUR 293,90 excl. VAT: € 246.97 / $ 246.97
M-VT300-68 6.8 0.10 3.0 3173 W 150x115x121 EUR 352,70 excl. VAT: € 296.39 / $ 296.39
M-VT300-82 8.2 0.10 3.0 3385 W 150x115x121 EUR 372,30 excl. VAT: € 312.86 / $ 312.86
M-VT300-100 10.0 0.12 3.0 2997 W 150x115x121 EUR 391,90 excl. VAT: € 329.33 / $ 329.33
M-VT300-120 12.0 0.13 3.0 2929 W 150x115x121 EUR 421,30 excl. VAT: € 354.03 / $ 354.03
M-VT300-150 15.0 0.15 3.0 2680 W 150x115x121 EUR 450,70 excl. VAT: € 378.74 / $ 378.74
*) 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.

T200 T300 Baked varnish BT140 vakuum impregnated VT125 VT140 VT180 VT236 VT300 VT390

Vacuum impregnated transformer core coil VT390

L denotes inductance, R the DC resistance, D the diameter, Le the length, Wire-W the width of the wire, DxH the diameter and the height.

Product ID L/mH R/Ohm Wire-
D/mm
Pmax*)
8Ohm
Coil Size
(DxH/mm)
Price
M-VT390-10 1.0 0.03 3.9 8018 W 130x100x106 EUR 293,90 excl. VAT: € 246.97 / $ 246.97
M-VT390-12 1.2 0.03 3.9 8553 W 130x100x106 EUR 313,50 excl. VAT: € 263.45 / $ 263.45
M-VT390-15 1.5 0.03 3.9 9087 W 130x100x106 EUR 333,10 excl. VAT: € 279.92 / $ 279.92
M-VT390-18 1.8 0.04 3.9 7216 W 130x100x106 EUR 352,70 excl. VAT: € 296.39 / $ 296.39
M-VT390-20 2.0 0.04 3.9 7617 W 130x100x106 EUR 264,00 excl. VAT: € 221.85 / $ 221.85
M-VT390-22 2.2 0.04 3.9 7934 W 150x115x121 EUR 431,10 excl. VAT: € 362.27 / $ 362.27
M-VT390-27 2.7 0.04 3.9 8462 W 150x115x121 EUR 460,50 excl. VAT: € 386.97 / $ 386.97
M-VT390-30 3.0 0.05 3.9 6939 W 150x115x121 EUR 348,00 excl. VAT: € 292.44 / $ 292.44
M-VT390-33 3.3 0.05 3.9 7193 W 150x115x121 EUR 489,90 excl. VAT: € 411.68 / $ 411.68
M-VT390-39 3.9 0.06 3.9 6347 W 150x115x121 EUR 529,10 excl. VAT: € 444.62 / $ 444.62
*) 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.