Furutech FI-E11-N1 (G)

The Furutech FI-E11-N1(G) is a Schuko connector designed for high-fidelity audio applications. It features 24-karat gold plating and benefits from Furutech’s proprietary Alpha treatment. This model is built to accommodate large-gauge conductors and incorporates several mechanical improvements over the previous version.

A controlled evolution: the FI-11-N1 series

The FI-E11-N1 is a significant update to the popular FI-E11. Furutech used this redesign to introduce two major innovations that transform the connector’s performance without disrupting its proven architecture.

The first innovation concerns the plating technique itself. The N1 series benefits from an improved process that increases the finish’s durability while refining its sonic qualities. For the gold version, this results in an even more fluid and enveloping signature, with a particularly rich harmonic texture in the midrange. Masamitsu Fukuda, a Japanese audio commentator, notes that this new gold plating promotes a natural musical flow that is slightly warm and smooth.

The second improvement involves the cable clamp. Furutech replaced the previous system with a non-magnetic stainless-steel metal collar that serves two complementary functions. On one hand, it firmly secures the cable without any risk of slippage, even with large-diameter conductors. On the other hand, it acts as a mechanical damper, absorbing vibrations that could propagate along the cable and affect signal transmission. This approach reflects Furutech’s attention to mechanical phenomena in electrical quality.

The alchemy of materials: conductors and treatments

At the heart of the FI-E11-N1(G) are alpha phosphor bronze conductors. This material choice is no accident. Phosphor bronze, a copper alloy containing tin and phosphorus, exhibits exceptional mechanical properties: high strength, excellent resilience to repeated stress, satisfactory electrical conductivity, and remarkable resistance to wear and corrosion. In applications requiring elastic and durable contacts, such as mains connectors subjected to multiple insertions, phosphor bronze outperforms pure copper.

The “alpha” designation refers to Furutech’s exclusive treatment. This two-step process begins with deep cryogenic freezing of all metal parts. Using liquid nitrogen or helium as a refrigerant, Furutech reaches temperatures between -196 and -250°C. At these thermal extremes, the metal’s molecular structure reorganizes: internal stresses inherited from manufacturing relax, molecules bond more tightly, and the overall structure gains stability. This transformation improves electrical conductivity and facilitates power transfer.

The second phase exposes these same parts to Furutech’s patented ring demagnetization. Unlike conventional powerful magnets that can locally increase magnetic effects, this process uses controlled attenuation to completely eliminate residual magnetization. This demagnetization further refines conductivity and contributes to a quieter noise floor.

The treated conductors are then coated with 24-karat gold plating. Gold has slightly lower conductivity than copper or silver, but it offers a decisive advantage: absolute chemical stability. No oxidation will degrade the contact surfaces over the years. Sonically, gold imparts a particular coloration, often described as warm, slightly softened in the treble, with a full-bodied midrange and powerful bass. This signature is especially suitable for systems seeking musicality and tonal balance rather than clinical analysis.

The connector body combines a glass fiber-reinforced nylon front and a black polycarbonate rear shell. These thermoplastic materials offer high dimensional rigidity, good heat resistance, and excellent insulating properties. Fiber-reinforced nylon also absorbs part of the mechanical vibrations, helping reduce mechanically induced distortions.

A distinct sonic character

The gold version of the FI-E11-N1 has a clearly defined sonic identity that sets it apart from its rhodium-plated sibling. Where rhodium prioritizes resolution, transparency, and precision with a high signal-to-noise ratio and pronounced contrasts across the spectrum, gold focuses on harmonic continuity and coherence.

With gold plating, the bass gains body and authority, delivering a solid foundation without excessive emphasis. The midrange is particularly expressive, with a texture that highlights the natural timbre of instruments and vocal inflections. The treble retains its sparkle while avoiding any harshness, offering a silky smoothness that favors long listening sessions.

The soundstage is constructed with stability and naturalness, favoring musical immersion over analytical dissection. This connector therefore suits systems seeking balance, fluidity, and warmth, or those whose components tend towards sharpness and benefit from a harmonious counterpoint. In high-efficiency or analytically inclined setups, some listeners may nevertheless find the rendering too rounded or insufficiently punchy.

Technical Specifications

Electrical Specifications

• Type: CEE 7/7 (2 poles + earth)
• Rated voltage: 250 V AC
• Rated current: 16 A

Physical Dimensions

• Body length: 56.2 mm
• Diameter: 39.3 mm
• Total length: 89.3 mm

Materials and Construction

• Conductor: Non-magnetic α (Alpha) phosphor bronze
• Front body: Nylon / fiberglass
• Housing: Black polycarbonate
• Strain relief clamp: Non-magnetic stainless steel with M4 × 20 mm screws
• Finish: 24-carat gold plating

Compatibility

• Compatible cable diameter: 6.6 mm to 16.0 mm
  • Extendable up to 20 mm with extended screw

Sonic Characteristics

• Fluid, harmonious, and warm sound
• Smooth tonal balance with a stable, natural soundstage
• Powerful, dynamic bass
• Silky highs
• Perfect for systems prioritizing musicality and coherence

Highlights

• Stable, fluid transmission thanks to Pure Transmission technology
• 24-carat gold finish for a warm musical presentation
• Anti-resonance, non-magnetic structure
• Premium materials for optimal durability
• Suitable for large-diameter audiophile cables

General Information

The Furutech FI-E11-N1(G) is a high-performance SCHUKO connector that combines Japanese manufacturing excellence with refined musicality. With its 24-carat gold plating and Pure Transmission technology, this connector delivers smooth, balanced transmission while preserving the signal’s harmonic richness. Ideal for music lovers seeking a warm, stable, and expressive sound.