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Lundahl transformers

Lundahl Transformers is a world leading manufacturer of high performance transformers for audio applications. The company is located in the small town Norrtälje, just outside Stockholm, Sweden.

A significant difference between Lundahl Transformers and other transformer manufacturing companies is that in addition to controlling the entire manufacturing process (including C-cores, bobbins, pin plates and housings) we also develop and build most of our production machines.
Capacitors

Capacitors (lat. condensus) are capacitive, meaning they store electrical power. The physical value that designates the capacity [C] (lat. capacitas) is Farad [F] (in honor of the English physicist and chemist Michael Faraday). They are made from two electrodes (conductive material) that are placed close to each other and a dielectric (non-conductive material) placed in-between the electrodes. A capacitor (short: cap) is a frequency-dependent resistor. This property is of great interest for audio applications because they filter low frequencies (deep tones) out of the music signal. Due to the fact that filtering performance declines with rising frequencies it applies accordingly that lowering the capacity means to boost the filtering (viz. so higher is the crossover frequency).
Coils

The sound characteristics of a coil are not only determined by the coil core and the manufacturing quality but also by the wire type used. In order to be able to offer you the right coil for each application we use three types of wires made of three materials of highest purity. OFC copper Coils that use oxygen-free copper (99.997% purity) as conductor material are characterised by a harmonic, stereophonic reproduction of music, rich in detail, and an excellent price/performance ratio. Pure silver Due to their ability to reproduce voices and instruments in a more dynamic, detailed, spatial manner and with more timbres compared to copper coils, silver coils of highest purity (type 99.99%) are highly appreciated and preferred by a number of audio enthusiasts. SilverGold 99% silver + 1% gold = 100% music. This does not only add up for capacitors such as the MCap® SUPREME SilverGold.Oil and audio cables, but also for coils. The high-purity gold (type 99.99%) changes the crystalline structure of silver and maximises its very good electric conductivity. Instruments and voices unfold their full range of timbres and their character is illuminated and becomes perceivable in all shades. On the one hand `crystal clear,´ the reproduction is at the same time vibrant and warm, embedded in a finely differentiated, location-true image. Purity and fine elegance combined with a vibrant character distinguish this exquisite material from all others! SolidCore wires The reproduction of music by coils made of solid round wires (also referred to as SolidCore) excels by natural vibrancy and fineness as well as highest tonal neutrality. Another benefit of round wire coils are their highly compact dimensions. Like all Mundorf coils, they are wound and mounted by hand with highest accuracy and precision using special machines in Germany. OFC standard is the most cost-efficient, audio-compatible coil wire and available in diameters from 0.50 to 3.90mm. Coils made of this material, however, do not have an additional coil fixation and thus have a disadvantage with respect to sound compared to all other coil types manufactured by Mundorf: This is because electric current passing through a coil will always cause a vibration of the entire winding. Due to the microphonic effect (the conversion of mechanical oscillations to electric oscillations) these mechanical oscillations are added to the original signal as additional information. This results in an interference with and an alienation of the details of the original signal. On the one hand, this results in a loss of spatial quality and transparency of the music and on the other hand in an increase of distortions and tonal discolorations of the signal. This physically induced unwanted effect, however, can be eliminated completely by the use of baked varnish wire or by means of vacuum impregnation. Baked varnish coils have a special, solid OFC round wire with an additional layer of varnish. After the coil has been wound, it is heated up by means of an electric impulse causing the additional layer to melt. When cooling down, the individual windings are firmly bonded together by the baked varnish and are thus prevented from vibrating and the original signal remains uncorrupted. Unfortunately, self-bonding wires are only available in diameters from 0.50 to 1.40mm. Vacuum impregnation is another procedure, equally effective as heat bonding, which we offer for coils with larger wire diameters (2.00 to 3.90mm). In vacuum impregnation, the coil is first impregnated with a special lacquer up to the innermost windings under vacuum. Subsequently, the impregnated coil is dried at 130° Celsius. Thus the whole coil is baked into a very solid unit.
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Kits, DIY and Loudspeaker upgrade kits

Here you can find DIY kita and upgrade kits for factory-manufactures speakers by different manufactures.
Speaker Drivers

A speaker driver is an individual transducer that converts electrical energy to sound waves, typically as part of a loudspeaker, television, or other electronics device. Sometimes the transducer is itself referred to as a speaker, particularly when a single one is mounted in a speaker enclosure or as surface-mounted device (as in a wall-mounted speaker, car audio speaker, and so on). There are many different types of speaker drivers. The most common ones are the woofer, mid-range and high-range tweeter, as well as bass-range subwoofers, which are very common. Less common types of speaker drivers are supertweeters and rotary woofers. This article concentrates on this sort of driver, the electrodynamic type. There are others which are far less widely used: electrostatic drivers, planar magnetic drivers, Heil air motion drivers, ionization drivers (limited to high frequencies only), piezoelectric drivers, among others. See articles devoted to them for details.
Metrum Acoustics DACs

Metrum Acoustics manufacturers NOS DACs and DAC modules for DIY customers.Product range include DACs Metrum Pavane, Metrum Hex, Octave Mk II DACs, Different DIY modules (DAC motherboards, transformers, power modules, digital modules , etc) and headphone amplifier - Aurix.

Metrum Acoustics manufacturers NOS DACs and DAC modules for DIY customers.

The following products are availabe:
Metrum Pavane DAC

Metrum Hex DAC with USB module and optional AES/EBU module

Metrun Octave Mk II with USB module

NEW! Metrun Musette with USB module

Metrum Aurix Headphone amplifier

All models available in black or silver.

Different DIY modules (DAC motherboards, transformers, power modules, digital modules , etc): please contact for pricing.
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