Components

Model overview 2019-05:

WVL A750
Premium Field Coil Loudspeaker, Frequency response: 70 - 13.000 Hz, Efficiency: 92 dB / 1 W / 1m, Resonance frequency: 70 Hz, Impedance: 8 Ω, Qts: 0,7 - 0,5 (WVL Field Coil Technology), Power handling: 50 Watts, Dimensions: W 260 x H 260 x D 190 mm, Weight: 6,3 kg.
WVL A6000
Premium Field Coil Loudspeaker, Frequency response: 20 - 20.000 Hz, Efficiency: max. 109 dB / 1 W / 1m, Resonance frequency: 35 Hz, Impedance: 8 Ω, Qts: 0,5 - 0,3 (WVL Field Coil Technology), Power handling: 50 Watts, Dimensions: ø 227 x D 155 mm, Weight: 8,5 kg.
WVL A2002
Premium Field Coil Loudspeaker, Frequency response: 375 - 12.000 Hz, Efficiency: 110 dB / 1 W / 1m, Resonance frequency: 375 Hz, Impedance: 8 Ω, Power handling: 150 Watts, Dimensions: ø 168 x D 162 mm, Weight: 16,5 kg.
WVL A4000
Premium Field Coil Loudspeaker Frequency response: 650 - 22.000 Hz, Efficiency: 105 dB / 1 W / 1m, Resonance frequency: 490 Hz, Impedance: 8 Ω, Power handling: 100 Watts, Dimensions: ø 136 x D 110 mm, Weight: 6,9 kg.
WVL A1200
Premium Field Coil Loudspeaker, Frequency response: 30 - 2.000 Hz, Efficiency: 95 dB / 1 W / 1m, Resonance frequency: 32 Hz, Impedance: 8 Ω, Qts: 0,7 - 0,2 (WVL Field Coil Technology), Power handling: 200 Watts, Dimensions: W 400 x H 400 x D 230 mm, Weight: 15,1 kg.
WVL A1500
Premium Field Coil Loudspeaker, Frequency response: 20 - 2.500 Hz, Efficiency: 96 dB / 1 W / 1m, Resonance frequency: 19 Hz, Impedance: 8 Ω, Qts: 0,7 - 0,2 (WVL Field Coil Technology), Power handling: 200 Watts, Dimensions: W 446 x H 416 x D 260 mm, Weight: 15,9 kg.





MADE IN GERMANY

Wolf von Langa products are all manufactured in Germany to exacting standards. We do have a great passion for controlling and optimizing processes, and incorporating refinements. 

Our craftsmanship is recognized and appreciated throughout the world. 

Our products represent the local mindset and they are far from being mass produced in an industrial operation; instead they are crafted in an environment where hand workmanship is a priority. 

And this makes a noticeable difference.


RESEARCH, DEVELOPMENT, AND PRODUCTION

Wolf von Langa products are assembled by experienced hands in the finest German tradition, without compromise, utilizing the latest technology, all the while embracing and taking into account the basic insights of the old masters whose designs are part of our culture, history, and tradition. Each piece has its own character and its own philosophy. 


WVL A750

Our modern field-coil loudspeaker version of the famous Western Electric WE755A (not to be confused with the later models using cloth suspension).

The all paper cone in its origin shape is attached to a new voice coil with symmetric grouped flexible connection wires, an extremely linear spring suspension induce uniform cone movement, the suspension treatment dampens the outer part of the cone effectively, and an all new field-coil motor and an extremely rigid but open frame construction ensures a consistent stimulus. 

Our modern field-coil loudspeaker version of the famous Western Electric WE755A (not to be confused with the later models using cloth suspension).


The all paper cone in its origin shape is attached to a new voice coil with symmetric grouped flexible connection wires, an extremely linear spring suspension induce uniform cone movement, the suspension treatment dampens the outer part of the cone effectively, and an all new field-coil motor and an extremely rigid but open frame construction ensures a consistent stimulus.



WVL A6000

An even higher achievable field strength now makes the brand new drive unit WVL A6000 horn-ready, together with our ultra-fast current source power supply these are the ultimate Single-Source team members. 

The development goal was an even higher efficiency and an absolutely homogeneous magnetic field for the CCA or Silver voice coil. The result will make you listen! 

An even higher achievable field strength now makes the brand new drive unit WVL A6000 horn-ready, together with our ultra-fast current source power supply these are the ultimate Single-Source team members.
Current and Pure Iron do make the music: WVL A6000 wideband transducer. This loudspeaker is one of the best fullrange speakers available in the world market!


Current and Pure Iron do make the music: WVL A6000 wideband transducer. This loudspeaker is one of the best fullrange speakers available in the world market! 


WVL A2002

The successor of our largest field coil unit A2000 as high current model and with optimized throat geometry. This is a superb midrange driver and complement to our WVL A1500.

Available mid 2019 (already in production).



WVL A4000

The WVL A4000 high frequency driver is a precision unit. The maximum conductor length of the edgewound aluminum ribbon voice coil is packed into the smallest possible air gap.

In opposite of Altec’s 806 or 802 we use an annular phase plug so that all frequencies are kept in unvarying phase relationship. Together with our field coil magnet, we hereby achieve an absolutely natural tonality. These drive units are able to reproduce the most complex transient waveforms and an impressive dynamic range.

Like all of our modern and adjustable field coil speakers they will recreate the most subtle nuances . The picture shows the bronze insert (sound guide) and all the standards of mounting.

In opposite of Altec’s 806 or 802 we use an annular phase plug so that all frequencies are kept in unvarying phase relationship. Together with our field coil magnet, we hereby achieve an absolutely natural tonality. These drive units are able to reproduce the most complex transient waveforms and an impressive dynamic range.


Like all of our modern and adjustable field coil speakers they will recreate the most subtle nuances . The picture shows the bronze insert (sound guide) and all the standards of mounting.

WVL A1200

The modern field-coil loudspeaker WVL A1200 compromises between dimensions and low frequency reproduction. 

Similar to Altec’s 414 exceptional paper cone with textile suspension our „12 inch“ speaker is capable to reproduce all notes up to 2 kHz without the ringing of it’s competitors.

Also our ventilated spider conforms to recent perceptions without the problem of loosing the restoring force due to excessive displacement. As the WVL A1200 is high efficient and this transducer uses an underhung voice coil the maximum amplitude is confined meaningful.

The modern field-coil loudspeaker WVL A1200 compromises between dimensions and low frequency reproduction. 

Similar to Altec’s 414 exceptional paper cone with textile suspension our „12 inch“ speaker is capable to reproduce all notes up to 2 kHz without the ringing of it’s competitors.
Also our ventilated spider conforms to recent perceptions without the problem of loosing the restoring force due to excessive displacement. As the WVL A1200 is high efficient and this transducer uses an underhung voice coil the maximum amplitude is confined meaningful.



WVL A1500

Realistic extended range reproduction from 25 Hz up to 2,500 Hz from a single driver. 

High efficiency design with less than 0.3% distortion measured on an IEC soundboard at a distance of 100 cm.

The pole pieces are shaped to a special form and are manufactured to the closest tolerances to allow true magnetic symmetry for the underhung voice coil.  This is WVL A1500 and all its model varieties.

We do use only the best material for our electro magnets. The pole pieces are manufactured from ≥99.85% pure iron stock. The NAWI paper cone has an extremely soft suspension to allow slightest cone movement and the cone apex is treated to ensure maximum stiffness. The field-coil has exceptionally low resistance and is designed for use with our precise current source.

The pole pieces are shaped to a special form and are manufactured to the closest tolerances to allow true magnetic symmetry for the underhung voice coil.  This is WVL A1500 and all its model varieties.


We do use only the best material for our electro magnets. The pole pieces are manufactured from ≥99.85% pure iron stock. The NAWI paper cone has an extremely soft suspension to allow slightest cone movement and the cone apex is treated to ensure maximum stiffness. The field-coil has exceptionally low resistance and is designed for use with our precise current source.



Count on Contents!

In search of the rediscovery of natural sound, Wolf von Langa has gone one step further. With respect to the old Jensen, Klangfilm, RCA, Voigt and Western Electric drivers, these type of transducers are now reviewed using a completely new technology.

Our speaker units are driven by a large field coil instead of a permanent magnet. In combination with our Power Supply Technology, the user is able to adjust the drivers to all installation conditions and playback requirements, and therefore to an unique and an extreme dynamic performance.

The Wolf von Langa field coil devices are completely shielded to avoid a radiation field and to improve their performance. The supply current conforms to all modern security and energy conservation issues to perform in your living room without complains.

What about the sound?
„This is not an upgrade in comparison to permanent magnet units. It is not more of something that already is there. This is something entirely different. There is only one possibility to describe the sound:
You are listening to THE REAL THING!“

Wolf von Langa A5000

The encapsulated A5000 motor drive unit is made of ≥99.85% pure iron. The edgewound copper field-coils provide the ultimate high current field-coil unit for use with our ultra fast current source power supplies. 

When we developed our motor drive we checked all 3rd party cone assemblies in the market and found one original Lowther UK cone assembly to be the very best. Tone color and distribution of harmonics are all second to none, and significantly without harshness.  


Field Coil Netzteil | Versorgung für fremd erregte Lautsprecher | Feldspulen Netzteil | Field Coil Power Supply

Myth and facts.

Field Coil Netzteil | Versorgung für fremd erregte Lautsprecher | Feldspulen Netzteil | Field Coil Power Supply

Myth and facts.


Only the current produces the magnetic field and not the voltage (Lorentz force).

F = B l i

F is the force 
B is the magnetic flux density (Tesla)
l is the length of the wire (coils)
i is the current flowing through the wire (excitation)

Therefore – and often misunderstood, even from professionals – a current source is the only type of power supply for every field coil speaker.

Typically a voltage source (transformer, rectifier (tube), a choke and a capacitor) is used for fashion reasons (we heard that Selen rectifiers are hip). More complex power supplies use filters with additional coils/inductors. But one thing remains variable: the current.

Some technicians argue that the BEMF (back electro motive force) must be shortened to dampen cone movement. This approach is interesting but does not meet latest insights of the field coil technology. 

With an appropriate current source we do control cone movement on the magnetic side, and this is where the music originates. Of course this does only function perfect if the speaker is constructed/built correspondingly (like ours).

Almost every existing amplifier in the market works as voltage source. A voltage source has a low internal impedance. The voice coil is connected to it. The field coil in opposite is not connected to the amplifier directly, but can be used to stabilize the magnetic force. 

In addition the field coil resistance increases during the process of warm up (like every conductor in this world). Therefore the current decreases at constant voltage until a balance of losses occur. Therefore magnetic flux density changes with constant voltage power supplies. This is significant because of the specific resistance of the field coil. Even small amounts of current changes alter the field strengths. This can be multiple 1000 Gauss (from let’s say a flux density of 10,000 Gauss). The overall quality of the speaker and every Thiele Small parameter changes inadvertently. This is not what we want.

Since the regulation properties of existing power sources are technically not perfect, we felt it imperative to design a new and customizable field coil power supply. These power supplies are working with High-Speed Controllers and partly with Lundahl filters. They are available on order, specifying the required parameters make it possible to use whatever field coil speaker you want to use.

Almost every existing amplifier in the market works as voltage source. A voltage source has a low internal impedance. The voice coil is connected to it. The field coil in opposite is not connected to the amplifier directly, but can be used to stabilize the magnetic force.


Convince yourself. Tell us the needed current and voltage for your field coil unit and order a FCA/FCCS power supply.

In addition the field coil resistance increases during the process of warm up (like every conductor in this world). Therefore the current decreases at constant voltage until a balance of losses occur. Therefore magnetic flux density changes with constant voltage power supplies. This is significant because of the specific resistance of the field coil. Even small amounts of current changes alter the field strengths. This can be multiple 1000 Gauss (from let’s say a flux density of 10,000 Gauss). The overall quality of the speaker and every Thiele Small parameter changes inadvertently. This is not what we want.
Since the regulation properties of existing power sources are technically not perfect, we felt it imperative to design a new and customizable field coil power supply. These power supplies are working with High-Speed Controllers and partly with Lundahl filters. They are available on order, specifying the required parameters make it possible to use whatever field coil speaker you want to use.



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Wolf von Langa produces worldwide unique field coil loudspeakers and drive units. Made in Bavaria, Germany.
WOLFVONLANGA® is a registered trademark, and is used with permission.