Components


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. 

The Wolf von Langa portfolio consists of items with strong personal character, forms and materials that merge into an unified whole, and which reinterpret our living space in a new and original way. 


A1 REALISTIC REPRODUCERS

The modern field-coil loudspeaker model A750 of the famous Western Electric WE755A


The modern field-coil loudspeaker model A750 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 ensures a consistent stimulus. 

We use this unit in our model AUDIO FRAME Chicago.

a750 specifications


A750

Frequency response: 70 - 13,000 Hz
Efficiency: 92 dB / 1 W / 1m
Resonance frequency: 70 Hz
Impedance: 8 Ω
Qts: 0.7 - 0.5 (our modern technology)
Power handling: 50 W sinus
Dimensions: W 260 x H 260 x D 190 mm
Weight: 6.3 kg



Similar to Altec’s 414 exceptional paper cone with textile suspension our 12 inch large A1200 is capable to reproduce all notes up to 2 kHz


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

Similar to Altec’s 414 exceptional paper cone with textile suspension our 12 inch large A1200 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 A1200 is high efficient and this transducer uses an underhung voice coil the maximum amplitude is confined meaningful.

a1200 specifications


A1200

Frequency response: 30 - 2,000 Hz
Efficiency: 96 dB / 1 W / 1m
Resonance frequency: 32 Hz
Impedance: 8 Ω
Qts: 0.7 - 0.2 (our modern technology)
Power handling: 200 W sinus
Dimensions: W 400 x H 400 x D 230 mm
Weight: 15.1 kg



Realistic extended range reproduction from 25 Hz up to 2,500 Hz from a single driver, this is A1500 and all its model varieties


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 A1500 and all its model varieties.

The pole pieces are manufactured from ≥99.85% pure iron stock. The NAWI paper cone has an extremely soft suspension 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.

a1500 specifications


A1500

Frequency response: 20 - 2,500 Hz
Efficiency: 96 dB / 1 W / 1m
Resonance frequency: 19 Hz
Impedance: 8 Ω
Qts: 0.7 - 0.2 (our modern technology)
Power handling: 200 W sinus
Dimensions: W 446 x H 416 x D 260 mm
Weight: 15.9 kg



In opposite of Altec’s 806 or 802 we use an annular phase plug so that all frequencies are kept in unvarying phase relationship in our A4000


The Wolf von Langa high frequency drivers A4000 are precision units, the edgewound aluminum ribbon voice coils pack maximum conductor length in the smallest possible space.

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 unit before nickel-plating, just out of the blistering oven. 

We use this unit in our late model DECORATOR, BLACK & WHITE, SWING und SALON.

a4000 a1.4000 specs


A4000

Frequency response: 650 - 22,000 Hz
Efficiency: 105 dB / 1 W / 1m
Resonance frequency: 490 Hz
Impedance: 8 Ω
Power handling: 100 W sinus
Dimensions: ø 136 x D 110 mm
Weight: 6.9 kg

In opposite of Altec’s 806 or 802 we use an annular phase plug so that all frequencies are kept in unvarying phase relationship



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!“

The A5000 is driven by a large field coil instead of a permanent magnet. You are listening to THE REAL THING!


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.  

We use this A5000 in our AUDIO FRAME London.

The encapsulated A5000 motor drive unit is made of ≥99.85% pure iron


A5000

Frequency response: 20 - 20,000 Hz
Efficiency: max. 108 dB / 1 W / 1m
Resonance frequency: 35 Hz
Impedance: 8 Ω
Qts: 0.5 - 0.3 (our modern technology)
Power handling: 50 W sinus
Dimensions: ø 227 x D 155 mm
Weight: 8.5 kg


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


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 called FCA/FCCS. They are available on order, specifying the required parameters make it possible to use whatever field coil speaker you want to use.

Wolf von Langa field coil power supply choke LUNDAHL. Only the current produces the magnetic field and not the voltage.


Give it a try and convince yourself. Tell us the needed current and voltage for your unit and order a FCA/FCCS power supply. You won’t regret it.

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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.