Sennheiser HD 660S2 Wired Audiophile Stereo Headphones with Natural, Relaxed, high-Fidelity Sound with Extra sub bass, Airflow-optimised 42mm high-Performance transducers, Designed in Germany

The Sennheiser HD 660S2 solves the common trade-off between energetic low-end and natural midrange clarity, delivering relaxed, high-fidelity listening with extra-sub-bass impact for a fuller, immersive experience. Whether you’re rediscovering studio masters, commuting with a portable amp, or enjoying quiet home critical listening, these open-back headphones provide precise imaging, airy treble and controlled bass without fatigue. Backed by Sennheiser’s 2-year manufacturer warranty and ’s genuine-product guarantee, fast shipping and dependable after-sales support, you get premium sound, trusted reliability and service you can count on.

Top Features

• Natural, relaxed sound signature — long listening comfort without fatigue
• Enhanced sub-bass impact — feels deeper and more musical, not boomy
• Airflow-optimised 42mm transducers — faster transient response and clarity
• Open-back design — expansive soundstage and precise instrument placement
• High-resolution detail retrieval — hear nuances and micro-dynamics
• Comfort-focused ergonomics — soft earpads and balanced clamping force
• Durable build quality — premium materials for daily use and longevity
• Wide compatibility — pairs with desktop DACs, headphone amps and high-end portables
• Detachable cable design — easy to replace or upgrade for different setups
• Designed in Germany — engineering-led tuning and consistent performance

Technical Specifications

Why Buy From ?

• 100% genuine Sennheiser products with authorised sourcing and serial verification
• Fast, insured delivery across India and careful packaging to protect premium gear
• Clear warranty support — we assist with manufacturer service claims and spare parts
• Dedicated customer care for setup advice, returns and follow-up service
• Secure payment options and transparent pricing with no hidden fees

Who Should Buy This?

• Audiophiles who want a natural, non-fatiguing tonal balance with deep sub-bass
• Home listeners and critical music fans seeking a wide, airy soundstage
• Mixing engineers and mastering professionals needing accurate midrange and detail
• Owners of DACs/headphone amps who want to unlock the headphone’s full potential
• Anyone prioritising build quality, comfort and long-session listening

Smart FAQs

Are the HD 660S2 headphones closed-back or open-back?

They are open-back headphones, designed to provide a wide soundstage and natural imaging. They leak sound and are best used in quiet environments.

Will these work with a smartphone without an amp?

They will work, but due to the 150 Ω impedance, pairing with a dedicated DAC/headphone amp will significantly improve dynamics, control and volume headroom.

Can I replace the cable or use a balanced cable?

Yes. The detachable cable allows for replacement and upgrades; check connector type and pinout for balanced options compatible with HD 660S2.

Do these headphones isolate noise?

No — as open-back headphones they do not provide passive isolation. They are intended for critical listening in low-noise settings rather than noisy commutes.

Is the bass too heavy for critical listening?

No — the HD 660S2 offers enhanced sub-bass fullness without muddiness, maintaining clear mids for accurate tonal balance suited to analytical and musical listening.

What if I have an issue under warranty?

supports warranty claims and will guide you through manufacturer service channels. We also verify product authenticity to streamline any repairs.

Are earpads replaceable?

Yes, earpads are replaceable. Use Sennheiser-approved pads for best fit and sound retention.