NorStone CL400

The CL400 Classic represents the perfect balance between technical performance and affordability in the world of speaker cables. Designed by Norstone, a renowned French manufacturer with over two decades of experience, this 2×4 mm² conductor is aimed at enthusiasts of authentic sound and installations requiring high power. Its high-purity OFC copper construction and intelligent design make it a benchmark choice for efficiently connecting amplifiers and speakers in both home and professional setups.

Detailed Physical and Technical Description

The CL400 Classic features meticulous construction that reflects Norstone’s expertise in audio connectivity. Its transparent sheath, measuring 10×4 mm, immediately reveals the quality of the copper conductors inside. This transparency is not just aesthetic: it allows for visual inspection of the wire strands and facilitates quality control during installation.

The 2×4 mm² conductors are made from OFC (Oxygen-Free Copper) with an impressive purity of 99.997%. This near-absolute purity results from a specific smelting process that eliminates traces of oxygen, which are responsible for micro-bubbles and oxidation that degrade electrical properties. The finely twisted multi-strand wires optimize flexibility while maintaining conductive performance.

The most notable feature lies in the differentiated shape of the two conductors: one has a round cross-section, the other rectangular. This intentional asymmetry allows for instant identification of polarity without additional markings, reducing wiring errors and speeding up installation.

Electrical Performance and Built-in Technologies

With a linear resistance of only 0.006 Ω per meter, the CL400 ranks among the most conductive cables in its class. This low resistance is a direct result of the OFC copper’s purity and the generous 4 mm² cross-section per conductor. In practice, this allows for significant cable lengths—up to 60 meters—without noticeable signal degradation.

The capacitance of 73.480 pF/m remains within acceptable values for most amplifiers, even those most sensitive to capacitive loads. This measurement reflects the optimization of the internal geometry and the careful selection of insulating materials.

The OFC copper used offers superior conductivity compared to standard copper thanks to the near-total absence of oxygen. This purity results in better transmission of fast transients and a reduction in micro-distortions. Electrons flow more freely in this optimized crystalline structure, preserving the dynamics and nuances of the musical signal.

Advantages and Distinctive Features

The transparent sheath design is a major asset of the CL400. Beyond the practical aspect of polarity identification, this transparency allows for ongoing visual inspection of the conductors’ condition. Unlike opaque sheaths that can hide potential defects, the CL400 displays its quality openly.

The value for money is particularly attractive in the high-performance cable segment. Norstone manages to offer a high-purity OFC conductor at an accessible price, democratizing access to technologies usually reserved for premium ranges.

The remarkable flexibility makes installation easy in tight spaces. The multi-strand wires retain their suppleness even after numerous manipulations, a significant advantage when modifying installations or during moves.

French manufacturing guarantees strict quality control and complete traceability. Norstone relies on French expertise to maintain high standards while offering short delivery times.

Technical Specifications

Physical Specifications

• Sheath (W × H): 10 × 4 mm
• Transparent sheath

Conductor

• Oxygen-free copper (OFC) conductor 2 × 4 mm²

Packaging

• Sold by the meter