Mundorf Coils are often categorised in air core coils and core coils. Air core coils usually don't have a core (they might have a synthetic core without electromagnetic properties). Core coils have a core made of ferromagnetic material (ferrite, iron sheet etc.) to increase its inductance.

Air core coils are best since they don't show any loss due to reverse flux. They often have the disadvantage of being too large at a given inductance and DC resistance. In this case, a ferromagnetic core has to be added to reduce the size.

The reverse flux loss in core coils

Cores made of ferromagnetic materials to increase coil inductance show two types of loss:
- hysteresis loss, since the core material (with elementary magnets) aligns itself slowly and
- Eddy-current loss due to the conductivity of the material.
Both loss types result in sound degradation and not applicable to air core coils.

DC Loss

The wire used for the coil possesses a DC resistance. Reducing the DC resistance by employing a coil in series to a bass driver, results in tighter and cleaner bass. The DC resistance doesn't cause any harmonic distortion and, therefore, sound degradation.

Microphonics Effect

Besides the reverse flux loss, the microphonics effect also plays a role in all types of coils.

The microphonics effect (interaction of current flowing through the coil -> magnetic field -> -> mechanical movement of coil wires -> and the resulting induced voltage in the coil) adds information to the original signal. Details of the original signal are overlaid and alienated; the music lacks three-dimensionality and transparency. To avoid this, the wires should be more secured in place. This can be done by
a) manufacturing the coil with baked varnish wires and where the entire coil is then baked too,
b) impregnating the coil in a vacuum with special varnish down to the innermost wires and is then baked
c) using a foil coil.

The table below shows which coil works best for a specific driver type.

Coil type (partly with brand names) Size DC-
resistance
Power handling Application Core material / properties
air core coil 0.7mm or backed varnish air core coil 0.7mm relatively small high low in parallel to tweeters or in correction circuits air / without reverse flux loss
air core coil 1.0mm or backed varnish air core coil 1.0mm medium medium medium in parallel to powerful tweeters
in series to midrange and small bass drivers
air / without reverse flux loss
air core coil 1.4mm or backed varnish air core coil 1.4mm large medium to small medium to high in series to midrange and bass drivers air / without reverse flux loss
air core coil 2.0mm or larger .... very large low high in series to bass drivers air / without reverse flux loss
air core coils made of copper, silver or silver/gold foil
Tritec air core coils
large medium to small medium to high in series to midrange and bass drivers
for state-of-the-art speakers
air / without reverse flux loss
F core coils small low to medium medium everywhere, where an air core coil would be too large or too pricey ferrite / with reverse flux loss
H71 and H100 core coil medium to small medium medium everywhere, where an air core coil would be too large or too pricey ferrite / with reverse flux loss
H140 core coils ,
I core coils
medium low high to very high in series to bass drivers
for speakers with high power handling
ferrite / with reverse flux loss
transformer core coils, Zero Ohm Coils medium high to very high in series to bass drivers
for speakers with high power handling
ferrite / with reverse flux loss

Please note: the coil's polarity is of no importance! Mundorf

Preferred coil types

All above coils are made from copper varnished wire with a purity of > 99,99%. The bobbin is made of synthetic material. The wire ends are tin-plated and marked. The inductance is measured at 25 degrees Celsius, tolerance is +/- 5%. L denotes inductance, R is the DC resistance, D the diameter and H the height. All prices include German VAT.

Please note: the values for Pmax were determined at 25 degrees Celsius ambient temperature at 50 Hz and with free convection. These are just ballpark figures! Since we are not the manufacturer we cannot guarantee the coils' measurement results.

All coils supplied by us are made by Mundorf, Intertechnik and Monacor.

 

Mundorf
Air core coils,
Type L71

absolutely low distortion
air core coil with 0.71 mm wire Mundorf Luftspule 0,7mm

 
Baked Varnish Air Coils
and other values
at our Mundorf page
 
 

Mundorf-SpulenAir Coils L71 (wire with 0.71 mm diameter)

Product ID L/mH R/Ohm Wire-
D/mm
Pmax*)
8Ohm
Coil Size
(DxH/mm)
Price
M-L71-005 0.050 0.19 0.71 35 W 25 x 10 EUR 3,85
M-L71-010 0.10 0.23 0.71 31 W 25 x 10 EUR 3,85
M-L71-012 0.12 0.25 0.71 42 W 36 x 10 EUR 3,95
M-L71-015 0.15 0.28 0.71 39 W 36 x 10 EUR 4,05
M-L71-018 0.18 0.31 0.71 38 W 36 x 10 EUR 4,15
M-L71-022 0.22 0.34 0.71 37 W 36 x 10 EUR 4,25
M-L71-027 0.27 0.39 0.71 34 W 36 x 10 EUR 4,35
M-L71-033 0.33 0.43 0.71 33 W 36 x 10 EUR 4,45
M-L71-039 0.39 0.51 0.71 29 W 36 x 10 EUR 4,55
M-L71-047 0.47 0.58 0.71 21 W 30 x 20 EUR 4,65
M-L71-056 0.56 0.64 0.71 20 W 30 x 20 EUR 4,75
M-L71-068 0.68 0.71 0.71 20 W 30 x 20 EUR 4,95
M-L71-082 0.82 0.81 0.71 18 W 30 x 20 EUR 5,25
M-L71-100 1.0 0.91 0.71 17 W 30 x 20 EUR 5,55
M-L71-120 1.2 1.0 0.71 18 W 40 x 20 EUR 5,75
M-L71-150 1.5 1.1 0.71 17 W 40 x 20 EUR 6,05
M-L71-180 1.8 1.2 0.71 17 W 40 x 20 EUR 6,55
M-L71-220 2.2 1.4 0.71 16 W 40 x 20 EUR 7,25
M-L71-270 2.7 1.5 0.71 15 W 40 x 20 EUR 7,65
M-L71-330 3.3 1.8 0.71 14 W 40 x 20 EUR 8,25
M-L71-390 3.9 2.0 0.71 16 W 58 x 18 EUR 8,65
M-L71-470 4.7 2.2 0.71 16 W 58 x 18 EUR 9,65
M-L71-560 5.6 2.4 0.71 16 W 58 x 18 EUR 10,50
M-L71-680 6.8 2.7 0.71 15 W 58 x 18 EUR 11,40
M-L71-820 8.2 3.1 0.71 14 W 58 x 28 EUR 12,40
M-L71-1000 10.0 3.6 0.71 13 W 58 x 28 EUR 13,40
*) 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
Air core coils,
Type L100

absolutely low distortion
air core coil with 1.0 mm wire Mundorf Luftspule 0,7mm

 
Baked Varnish Air Coils
and other values
at our Mundorf page

Mundorf-SpulenAir Coils L100 (wire with 1.0 mm diameter)

Product ID L/mH R/Ohm Wire-
D/mm
Pmax*)
8Ohm
Coil Size
(DxH/mm)
Price
M-L100-010 0.10 0.14 1.00 82 W 30 x 20 EUR 4,35
M-L100-012 0.12 0.15 1.00 82 W 30 x 20 EUR 4,45
M-L100-015 0.15 0.17 1.00 77 W 30 x 20 EUR 4,65
M-L100-018 0.18 0.19 1.00 73 W 30 x 20 EUR 4,75
M-L100-022 0.22 0.21 1.00 70 W 30 x 20 EUR 4,95
M-L100-027 0.27 0.23 1.00 68 W 30 x 20 EUR 5,15
M-L100-033 0.33 0.26 1.00 77 W 40 x 20 EUR 5,45
M-L100-039 0.39 0.29 1.00 71 W 40 x 20 EUR 5,75
M-L100-047 0.47 0.32 1.00 67 W 40 x 20 EUR 6,05
M-L100-056 0.56 0.36 1.00 62 W 40 x 20 EUR 6,35
M-L100-068 0.68 0.39 1.00 60 W 40 x 20 EUR 6,65
M-L100-082 0.82 0.44 1.00 56 W 40 x 20 EUR 6,95
M-L100-100 1.0 0.49 1.00 61 W 58 x 18 EUR 7,55
M-L100-120 1.2 0.54 1.00 63 W 58 x 18 EUR 8,05
M-L100-150 1.5 0.62 1.00 60 W 58 x 18 EUR 8,65
M-L100-180 1.8 0.70 1.00 58 W 58 x 18 EUR 9,15
M-L100-220 2.2 0.83 1.00 53 W 58 x 22 EUR 10,10
M-L100-270 2.7 0.90 1.00 46 W 58 x 28 EUR 10,50
M-L100-330 3.3 1.1 1.00 44 W 58 x 28 EUR 12,40
M-L100-390 3.9 1.1 1.00 43 W 58 x 28 EUR 13,40
M-L100-470 4.7 1.3 1.00 46 W 70 x 29 EUR 14,40
M-L100-560 5.6 1.4 1.00 44 W 70 x 29 EUR 16,30
M-L100-680 6.8 1.6 1.00 42 W 70 x 29 EUR 18,20
M-L100-820 8.2 1.7 1.00 39 W 70 x 29 EUR 20,25
M-L100-1000 10.0 1.9 1.00 36 W 70 x 29 EUR 23,15
*) 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
Air core coils,
Type L140

absolutely low distortion
air core coil with 1.4 mm wire Mundorf Luftspule

Baked Varnish Air Coils
and other values
at our Mundorf page

Mundorf-SpulenAir Coils L140 (wire with 1.4 mm diameter)

Product ID L/mH R/Ohm Wire-
D/mm
Pmax*)
8Ohm
Coil Size
(DxH/mm)
Price
M-L140-010 0.10 0.07 1.4 267 W 40 x 20 EUR 5,55
M-L140-012 0.12 0.08 1.4 265 W 40 x 20 EUR 6,05
M-L140-015 0.15 0.10 1.4 237 W 40 x 20 EUR 6,55
M-L140-018 0.18 0.11 1.4 251 W 58 x 18 EUR 7,15
M-L140-022 0.22 0.12 1.4 248 W 58 x 18 EUR 7,65
M-L140-027 0.27 0.13 1.4 245 W 58 x 18 EUR 8,05
M-L140-033 0.33 0.15 1.4 227 W 58 x 18 EUR 8,65
M-L140-039 0.39 0.16 1.4 239 W 58 x 18 EUR 9,15
M-L140-047 0.47 0.19 1.4 213 W 58 x 18 EUR 9,65
M-L140-056 0.56 0.20 1.4 192 W 58 x 22 EUR 10,50
M-L140-068 0.68 0.23 1.4 197 W 58 x 28 EUR 11,40
M-L140-082 0.82 0.26 1.4 184 W 58 x 28 EUR 12,40
M-L140-100 1.0 0.30 1.4 168 W 58 x 28 EUR 13,40
M-L140-120 1.2 0.34 1.4 164 W 70 x 29 EUR 14,40
M-L140-150 1.5 0.38 1.4 156 W 70 x 29 EUR 15,30
M-L140-180 1.8 0.43 1.4 146 W 70 x 29 EUR 16,30
M-L140-220 2.2 0.46 1.4 152 W 70 x 29 EUR 18,20
M-L140-270 2.7 0.51 1.4 133 W 77 x 28 EUR 19,20
M-L140-330 3.3 0.58 1.4 131 W 77 x 28 EUR 23,15
M-L140-390 3.9 0.65 1.4 123 W 77 x 28 EUR 25,05
M-L140-470 4.7 0.80 1.4 103 W 70 x 59 EUR 27,95
M-L140-560 5.6 0.89 1.4 98 W 70 x 59 EUR 30,85
M-L140-680 6.8 1.1 1.4 86 W 70 x 59 EUR 33,85
M-L140-820 8.2 1.1 1.4 89 W 70 x 59 EUR 37,65
M-L140-1000 10.0 1.2 1.4 94 W 88x75x61 EUR 41,55
*) 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 Drum-core coils (H coils) with ferrite


Mundorf Rollenkernspule
The design of this coil type is similar to the air core coil, except that it contains a ferrite core. The vertical bar is resting partly inside the coil while the horizontal bar is covering the labelled side. The magnetisation curve is linear at small to medium volumes, meaning that distortion is low.
 

Mundorf-coilsFerrite Coils

Mundorf Mundorf H Core Coil H100 (wire with 1.0 mm diameter)

Product ID L/mH R/Ohm Wire-
D/mm
Pmax*)
8Ohm
Coil Size
(DxH/mm)
Price
M-h100-068 0.68 0.11 1.00 177 40 x 38 EUR 6,35
M-h100-082 0.82 0.12 1.00 167 40 x 38 EUR 6,35
M-h100-100 1.0 0.13 1.00 159 40 x 38 EUR 9,65
M-h100-120 1.2 0.15 1.00 142 40 x 38 EUR 11,10
M-h100-150 1.5 0.17 1.00 129 40 x 38 EUR 11,40
M-h100-180 1.8 0.19 1.00 118 40 x 38 EUR 12,00
M-h100-200 2.0 0.20 1.00 115 40 x 38 EUR 12,40
M-h100-220 2.2 0.21 1.00 111 40 x 38 EUR 13,00
M-h100-270 2.7 0.24 1.00 100 40 x 38 EUR 13,40
M-h100-300 3.0 0.25 1.00 99 40 x 38 EUR 14,40
M-h100-330 3.3 0.27 1.00 93 40 x 38 EUR 15,30
M-h100-390 3.9 0.30 1.00 88 40 x 38 EUR 16,30
M-h100-470 4.7 0.34 1.00 82 40 x 38 EUR 17,30
M-h100-560 5.6 0.39 1.00 74 40 x 38 EUR 18,20
M-h100-680 6.8 0.46 1.00 64 40 x 38 EUR 19,20
M-h100-820 8.2 0.54 1.00 57 40 x 38 EUR 20,25
M-h100-1000 10.0 0.64 1.00 58 56 x 35 EUR 24,15
M-h100-1200 12.0 0.71 1.00 59 56 x 35 EUR 25,05
M-h100-1500 15.0 0.83 1.00 53 56 x 35 EUR 26,05
M-h71-1800 18.0 1.3 0.71 21 40 x 38 EUR 15,90
M-h71-2200 22.0 1.5 0.71 18 40 x 38 EUR 16,30
M-h71-2700 27.0 1.7 0.71 17 40 x 38 EUR 16,90
M-h71-3300 33.0 1.9 0.71 15 40 x 38 EUR 17,30
*) 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.

More H core coils (H71, H100, H140, BH71, BH100 and BH140) are on the H core page.

 

PA transformer core coils

Monacor transformer core coil with high power handling. The coil has OFC wire turns and is vacuum impregnated.PA-Spule These characteristics are available at an amazingly low price.

This coil is also suited for subwoofers and bass drivers in hi-fi loudspeakers.

Product ID
Type
L/mH R/Ohm wire
D/mm
Pmax     
8Ohm
dimensions
(DxH/mm)
Price
mo-125410 2.2 0.10 1.2 500 W 6050x42 EUR 18,00
mo-125420 2.7 0.12 1.2 500 W 60x50x42 EUR 18,80
mo-125430 3.3 0.13 1.2 500 W 60x50x42 EUR 19,20
mo-125440 3.9 0.16 1.2 500 W 60x50x42 EUR 19,70
mo-125450 4.7 0.14 1.4 500 W 68x58x55 EUR 25,80
mo-125460 5.6 0.15 1.4 480 W 68x58x55 EUR 26,60
mo-125470 6.8 0.16 1.4 480 W 68x58x55 EUR 27,70
mo-125480 8.2 0.17 1.4 370 W 68x58x55 EUR 28,70
mo-125490 10 0.19 1.4 330 W 68x58x55 EUR 30,00
mo-123190 12 0.14 1.6 480 W 76x65x92 EUR 63,10
mo-123200 15 0.12 1.8 1000 W 96x82x102 EUR 87,80
*) Pmax 8 Ohm is the maximum power that this coil is able to deliver to the bass driver (at 4 Ohm this value has be halved).

to other coils:

Mundorf large Mundorf air core coils.

Mundorf CFC coils (copper foil capacitor)
with excellent three-dimensionality and attention to detail; they belong to the group of exceptionally neutral capacitors.

Mundorf Aronit core coils

Mundorf Feron i core coils

Mundorf Feron transformer core coils

Mundorf Zero Ohm Coils

Further coils upon request
 
 
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