inakustik : S25 Speaker 425 Singlewire BFA (3.0M)

• Multicore structure: minimizes inductance, preserves details
• Tight bass control with precise punch
• OFC copper & gold-plated connectors for minimal transmission loss
• Elegant design, high flexibility despite large cross-section
• Conductor cross-section: 2 x 5.0 mm²

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The S25 Speaker 425 is the most powerful model in the series, designed for audiophile setups with high power reserves and long cable runs. The large conductor cross-section and low-inductance multicore design ensure exceptionally low-loss transmission – even under high load or long cable lengths. The sound benefits from a particularly controlled, deep-reaching bass with precise punch, clearly defined mids, and an open, detailed high-frequency reproduction. The spatial presentation is stable and wide. Thanks to high-quality materials such as fine-stranded OFC copper, solid crimp contacts, and gold-plated connectors, the signal remains unaltered along the entire length. Its discreet, functionally elegant design and surprisingly high flexibility despite the large cross-section allow for neat, unobtrusive installation – even in complex rack setups or close to walls.

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Sound doesn't start at the speaker

Speaker cables are much more than just wires between the amplifier and the speaker – they help determine how much of the music actually reaches you. Electrically, every cable acts like a filter made up of resistance, inductance, and capacitance. These properties influence whether details are preserved or whether highs lose brilliance and bass loses precision. Especially for speaker cables, conductor cross-section, copper quality, and construction are crucial for low-loss, dynamic signal transmission. The S25 series relies on high-purity OFC copper, thoughtful multicore designs, and flexible, durable materials. This keeps the music signal clear, true to impulse, and authentic – so you hear what’s really on the recording. A good cable doesn’t color the sound, it transmits it: It is the stable bridge between your components and musical expression. 

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Multicore technology: More control, more sound

A technical core feature of the S25 speaker cables is their multicore construction. Unlike conventional conductors, several fine-stranded individual wires run parallel to each other – this reduces cable inductance, improves high-frequency characteristics, and preserves the signal structure even during fast transients. The symmetrical distribution of the conductors also helps minimize interference, as magnetic fields partially cancel out. This is especially evident in the Speaker 415 and 425 models, resulting in tight, well-defined bass reproduction, precise soundstage imaging, and brilliant high-frequency detail resolution. The result: high impulse fidelity, greater control, and spatial sound that remains stable – even during complex passages.

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OFC copper: Pure material for pure music

For the S25 series, we use only high-purity, oxygen-free copper (OFC) with a purity level of at least 99.95%. This material offers excellent electrical conductivity and reduces transmission losses – even over long cable runs or with high current flow. OFC copper is also highly resistant to corrosion, ensuring long-term sound stability. Combined with high-quality insulation materials and gold-plated connectors, the signal remains unaltered – from the amplifier output to the speaker terminals. S25 cables deliver music with high transparency and authentic dynamics – honest, direct, and without artificial coloration.

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Crimp technology & gold-plated contacts

Connector joints are critical points in any signal path – they determine whether sound quality remains consistent. The S25 series uses professional crimp technology: fine-stranded copper conductors are gas-tight pressed under high pressure, effectively preventing corrosion and ensuring lasting contact stability. Gold-plated plugs provide consistently low contact resistance and are resistant to oxidation – even with frequent plugging and unplugging. This combination guarantees a reliable, sonically clean connection that neither swallows details nor slows down dynamics. For lasting sound fidelity – completely maintenance-free.