Sennheiser HD 660S2 Open‑Back Wired Over‑Ear Headphones — Audiophile-Grade Open-Back Wired Headphones
The Sennheiser HD 660S2 Open-Back Wired Over-Ear Headphones are premium high-fidelity audiophile headphones designed for deep listening and studio-grade sound reproduction. As part of Sennheiser’s legendary HD 600 series lineage, the HD 660S2 brings refined natural sound, wide soundstage and precision audio performance to demanding listeners who want an immersive, detailed audio experience from wired headphones.
Audiophile-Tuned Open-Back Sound
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Open-back over-ear design delivers a spacious, natural soundstage with enhanced ambient detail and instrument separation — ideal for critical listening, home audio and studio monitoring.
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38 mm high-performance dynamic drivers engineered for neutral, precise sound with extended sub-bass, clear mids and smooth highs.
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Optimized airflow and vented magnet system reduce distortion and produce balanced audio that stays true across genres and dynamic ranges.
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Frequency response of 8 Hz – 41,500 Hz captures deep lows and crisp highs for immersive high-resolution listening.
Superior Sound Engineering & Performance
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300 Ω impedance and 104 dB sensitivity provide detailed, controlled sound suitable for use with high-quality headphone amplifiers or DACs for best performance.
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Ultra-light aluminum voice coils improve transient response and impulse fidelity, reducing distortion and delivering accurate detail.
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Low total harmonic distortion (<0.04%) ensures clean, uncoloured audio even at higher volumes.
Premium Craftsmanship & Comfort
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Ergonomic, lightweight build (~260 g) with plush velour ear pads and headband for long-session comfort.
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Designed and manufactured with high-quality components, including robust open-back housings and breathable materials.
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Detachable premium cables included for flexible connectivity:
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Balanced 4.4 mm cable for high-fidelity systems
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Unbalanced 6.3 mm cable with 3.5 mm adapter for broader compatibility
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