Supra Classic 2.5 blue

Name: Classic 2.5 blue
Brand: Supra
SKU: 7330060000010
Price: 4.5 EUR
Availability: InStock
Rating: 4.9 (101 reviews)

(101 customer reviews)

Overview

The Supra Classic 2.5 blue embodies over four decades of Swedish expertise in the art of hi-fi cabling. This speaker cable with a 2 × 2.5 mm² cross-section, sold by the meter, continues the legacy of the brand that revolutionized the industry in 1976 by creating the very first cable specifically designed for high fidelity. Intended for discerning enthusiasts seeking unbeatable value for money, the Classic 2.5 combines proven technologies with affordable pricing.

The Art of Multi-Strand Construction

The design of the Classic 2.5 is based on an architecture of 511 concentric strands per conductor, a remarkably high number that reflects attention to detail even in the entry-level range. Each strand of OFC (Oxygen Free Copper) boasts a purity greater than 99.999%—a level known as “5N” in technical jargon. This exceptional purity eliminates micro-oxygen bubbles responsible for electrical discontinuities and sound degradation.

All these strands benefit from full tin-plating, a process in which each copper filament receives a tin coating. This technique presents a fascinating paradox: although tin is less conductive than copper, it paradoxically improves overall performance. By minimizing the skin effect, which concentrates high frequencies at the conductor’s periphery, tin-plating promotes electrical conduction at the very core of the copper. At the same time, this metallic protection forms an effective barrier against the natural oxidation of copper over the years.

Electrical Performance and Stabilized Insulation

The electrical characteristics of the Classic 2.5 reveal a carefully studied balance. Its resistance of 0.0068 Ω per meter at 20°C ensures faithful transmission even over significant lengths, while its inductance of 0.45 µH per meter at 1 kHz maintains the frequency linearity essential for musical reproduction.

The PVC insulation stabilized with chloride ions is a less visible but crucial innovation for longevity. This specially formulated polymer significantly slows down corrosion processes, preserving the integrity of the tinned conductors over the long term. The external dimensions of 3.6 × 7.4 mm offer an optimal compromise between ease of handling and electrical performance.

Versatility and Compatibility

The Classic 2.5 excels in its ability to adapt to the most varied configurations. In stereo hi-fi, it is perfectly suited for medium-power systems, from bookshelf speakers to mid-sized floorstanders. Its 2.5 mm² cross-section allows for the passage of substantial currents without excessive heating, even during dynamic musical passages.

In home theater setups, this cable naturally finds its place powering effect and surround speakers, where its multi-strand construction provides the flexibility needed for discreet installations. For front channels requiring more power, the option to double the conductors (bi-wiring) significantly extends its capabilities.

Compatibility extends to all amplifiers on the market, from tube models to modern digital amplifiers. The cable’s low inductance preserves the stability of amplifiers sensitive to capacitive loads, while its moderate resistance maintains an acceptable damping factor.

Swedish Manufacturing Excellence

100% Swedish manufacturing in the Ljungskile factories guarantees a consistent level of quality according to Supra’s “No Nonsense” standards. Each cable length undergoes rigorous controls, including precise electrical measurements and batch number marking for complete traceability of the production process.

This manufacturing expertise results in remarkable consistency of electrical characteristics from one meter to the next. The assembly of the 511 strands in each conductor follows strict procedures inherited from the aerospace industry, a field in which Supra also applies its technical expertise.

Technical Specifications

Construction

511 concentric strands × 2
Oxygen-free copper (OFC)

Physical Specifications

Insulation: PVC (chloride ion stabilized)
Outer dimensions: 3.6 × 7.4 mm

Electrical Characteristics

Inductance: 0.45 µH / m at 1 kHz
Resistance: 0.0068 Ω / m at 20 °C

Commercialization

Sold by the meter

Frequently Asked Questions

What is the maximum length I can use without audible degradation?

The Classic 2.5 maintains its qualities up to 15–20 meters for most home applications. Beyond that, the increased resistance becomes noticeable with low-efficiency speakers. For longer distances, consider moving up to a 4 mm² cross-section or using doubled cables.

Can I mix the Classic 2.5 with other cables in my setup?

There are no technical contraindications, but optimal sound homogeneity is achieved by using the same model throughout the system. If you must mix, preferably reserve the Classic 2.5 for the less critical speakers (surrounds, height) and keep higher-end cables for the front channels.

How do I distinguish the positive from the negative conductor on this cable?

Supra generally marks one of the conductors with a discreet marking or a color variation in the insulation. If in doubt, adopt a consistent convention throughout your system and note it down to facilitate any future modifications.

Does tin-plating require any special maintenance?

Tin-plating does not require any specific maintenance. It retains its protective properties for decades. Simply avoid aggressive cleaning products that could attack the PVC insulation. A slightly damp cloth is sufficient for dusting.

Is this cable suitable for bi-amped or tri-amped systems?

The Classic 2.5 is perfectly suited for bi-amped configurations, especially appreciated for separating bass and mid-treble channels. In tri-amping, reserve it for the mid and treble channels, which are less current-hungry than the bass, which typically requires a larger cross-section.

Can I bury this cable or use it outdoors?

The Classic 2.5 is not designed for direct burial. Its PVC insulation withstands occasional weather but requires protection (sheath, conduit) for permanent outdoor use. For buried installations, choose cables specifically certified for this purpose.

How does this cable compare to higher-end Supra models?

The Classic 2.5 shares the fundamental technologies (OFC 5N, tin-plating) with the high-end models but in a simplified construction. The higher-end cables offer more complex geometries, more sophisticated insulators, and sometimes alternative surface treatments (silver), justifying their higher price positioning.