Unitra KG-25 2 x 4m
Overview
The Unitra KG-25 embodies Polish expertise in high-fidelity speaker cable design. Designed for demanding audio systems, this 2.5 mm² oxygen-free copper cable combines proven manufacturing techniques with careful finishing, offering optimal signal transmission for your hi-fi equipment. Manufactured entirely in Poland using traditional machines and individually tested, the KG-25 perpetuates the tradition of quality that has made Unitra renowned since 1961.
Meticulous construction in service of sonic purity
The KG-25 stands out with its twisted parallel conductor structure, a technical configuration that minimizes electromagnetic interference while preserving audio signal integrity. The oxygen-free copper (OFC) conductors guarantee superior conductivity by drastically reducing impurities that could alter signal transmission. This purity of the conductive material translates to a particularly low linear resistance of 0.0049 Ω/m, enabling transmission without notable loss.
The outer sheath features a distinctive honey-colored Polish thread finish, achieved through a braiding process performed on vintage Polmatex-Majed machines installed in Łódź. These industrial braiding machines, used for decades in the Polish textile industry, give the cable not only a recognizable aesthetic but also additional mechanical protection. The flexible PVC compound used for the inner sheath and filling material ensures optimal flexibility while protecting the conductors from mechanical and environmental stress.
The gold-plated banana plugs terminating the cable represent a judicious technical choice for several reasons. The gold plating effectively prevents contact corrosion and oxidation, thus maintaining maximum conductivity over time. The flexible design of these connectors allows them to adapt to a wide range of terminal diameters, facilitating installation on different types of amplifiers and speakers.
Calibrated electrical and acoustic performance
The 2.5 mm² cross-section of the KG-25 represents an optimal compromise for most domestic hi-fi installations. This dimension allows comfortable handling of power up to 100 watts while maintaining sufficient flexibility for easy routing behind furniture and equipment. The operating temperature range, extending from 0°C to 80°C, guarantees stable performance regardless of usage conditions, whether in an air-conditioned room or near a heat-generating amplifier.
The twisted parallel conductor construction plays a crucial role in maintaining signal purity across the entire audio bandwidth. This particular geometric configuration helps balance the cable’s electrical parameters - capacitance, inductance, and resistance - across the entire audible frequency spectrum, from 20 Hz to 20,000 Hz. Bass frequencies retain their impact and definition, midrange maintains its natural presence, while treble preserves its finesse and extension without harshness.
An exceptional Polish manufacturing process
Each KG-25 cable demonstrates Unitra’s commitment to entirely Polish production, carried out in the brand’s Warsaw facilities. The manufacturing process combines preserved artisanal techniques with modern quality controls. The external braiding, performed on vintage Polmatex-Majed machines, requires specific expertise that Unitra operators have perfectly mastered. These machines, witnesses to the Polish industrial era, continue to operate with remarkable precision, giving each cable a braiding regularity difficult to achieve with modern equipment.
After assembly, each cable undergoes a battery of individual tests performed with a Kikusui tester, Japanese equipment recognized in the industry for its precision in continuity and resistance measurements. This systematic verification ensures that each KG-25 specimen strictly adheres to the announced electrical specifications. Tests include continuity verification along the entire cable length, precise resistance measurement, and validation of insulation between conductors.
Technical specifications
Dimensions and construction
- Cable length: 4 m
- Cross-sectional area: 2.5 mm²
- Conductor type: parallel twisted conductors
Electrical specifications
- Operating temperature: 0 °C to 80 °C
- Linear resistance: 0.0049 Ω/m
Materials and finishes
- Conductor material: oxygen-free copper (OFC)
- Connectors: flexible gold-plated banana plugs compatible with a wide range of terminals
- Inner jacket: PVC compound
- Filler material: flexible PVC compound
Frequently Asked Questions
Are the banana plugs compatible with all amplifiers?
The KG-25’s flexible gold-plated banana plugs offer extensive compatibility thanks to their adaptive design. They automatically adjust to terminal diameter variations, whether screw-type or spring-loaded. The gold plating ensures optimal contact and prevents oxide formation that could degrade the connection over time.
Why choose OFC copper over standard copper?
Oxygen-free copper contains less than 0.001% oxygen, compared to approximately 0.02% for standard electrolytic copper. This difference may seem minimal, but it directly influences the metal’s crystalline structure and therefore its conductivity. OFC copper presents longer grains and fewer inter-granular boundaries, reducing signal transmission resistance and minimizing micro-distortions, particularly perceptible in high-resolution systems.
Does the external braiding serve a technical function or is it purely aesthetic?
The Polish thread braiding serves multiple functions. Beyond its distinctive honey-colored appearance, it offers mechanical protection against abrasion and snags. The braiding also maintains constant internal conductor geometry, even during cable manipulation or bending, thus preserving optimal electrical characteristics. This traditional technique, performed on Polmatex-Majed machines, gives the cable controlled flexibility that facilitates installation.
Is the KG-25 suitable for high-power speakers?
With its 2.5 mm² cross-section, the KG-25 is ideally suited for systems up to 100 watts in normal use. For more powerful amplification or distances exceeding 4 meters, Unitra offers the KG-40 with a 4 mm² cross-section. The choice between the two models depends on your specific configuration: amplifier power, speaker sensitivity, and cabling distance.
- Eco-contribution included in the sale price.
- Manufacturer reference: KG25-02