Sennheiser HD 660S2 Wired Audiophile Headphone

Sennheiser HD 660S2 Redefined

For audiophiles who crave detail, balance, and a touch of warmth in their sound signature, the Sennheiser Consumer AudioSennheiser HD 660S2 is a true masterpiece. Designed to deliver a natural and high-fidelity sound experience, these open-back headphones bring together top-tier transducer technology, deep sub-bass response, and ergonomic comfort for hours of fatigue-free listening. Whether you’re critically analyzing music or simply enjoying your favorite playlist, the HD 660S2 see all our tech review proves that Sennheiser continues to set the standard in the audiophile world.

Engineered in Germany and crafted in Ireland, the Sennheiser HD 660S2 builds upon the legacy of the legendary HD 600 series, introducing refined upgrades such as an ultra-light aluminum voice coil, vented magnet system, and balanced cable options, making it ideal for desktop DAC/amp setups and studio monitors.

Audiophile Sound Signature

At the core of the Sennheiser HD 660S2 is its 42mm high-performance transducer, engineered with airflow optimization for superior sound reproduction. The result is an incredibly detailed, balanced, and intimate soundstage with an enhanced sub-bass response—a feature many audiophiles missed in previous HD models.

The 300-ohm impedance and ultra-light aluminum voice coil ensure fast transient response, allowing you to hear every subtle change in dynamics with pristine clarity. This makes the HD 660S2 ideal for:

• Classical and orchestral music
  
• Acoustic and instrumental tracks
  
• Studio monitoring and professional audio production
  
• High-resolution streaming from services like TIDAL, Qobuz, and Amazon Music HD

Deep Sub-Bass

While the original Sennheiser HD 660S2 was known for its neutrality, the Sennheiser HD 660S2 takes it a step further by doubling the sound pressure at the lowest octaves. Whether it’s the lowest note of a grand piano at 27.5 Hz or the tight punch of a kick drum at 45-60 Hz, this headphone delivers deep, controlled bass that you can both hear and feel—without overwhelming the mids or highs.

This balanced bass makes the HD 660S2 a dream for both casual listening and professional work, providing the full spectrum of sound without distortion or coloration.

Airflow-Optimized Transducers & Vented Magnet System

Sennheiser HD 660S2 Premium headphoone sound performance is greatly enhanced by a vented magnet system and airflow-optimized transducers, which minimize distortion and allow precise air displacement. This improves the tonal accuracy and overall harmonic structure of your music.

The steel mesh damping system helps maintain control over airflow, giving the headphone an open and clean presentation that is uniquely natural to the ear. These enhancements make the Sennheiser HD 660S2 a worthy upgrade over the original HD 660S and a direct competitor to some of the best in its class.

Open-Back Design for a Soundstage

As with any true audiophile headphone, the open-back design of the HD 660S2 headphone collection allows sound to interact naturally with the environment, creating a realistic soundstage with excellent instrument separation and stereo imaging. This makes these headphones exceptional for:

• Live concert recordings
  
• Ambient, cinematic, or binaural audio
  
• Detailed mixing and mastering

Balanced Connectivity Options

Sennheiser HD 660S2 supports balanced audio connectivity, offering detachable long cables compatible with both standard unbalanced (6.3mm) and balanced outputs (4.4mm Pentaconn). This ensures clean signal transmission and minimal interference when used with a DAC, headphone amplifier, or studio interface.

Balanced output is ideal for audiophiles who demand reduced crosstalk and distortion for the purest listening experience.

Exceptional Build Quality and Comfort

Sennheiser’s German engineering shines through the robust and lightweight design of the HD 660S2. The headphones are built for extended listening sessions with:

• Plush velour ear cushions that offer breathable comfort
  
• Low clamping force for fatigue-free wear
  
• Durable plastic and metal frame for long-term use
  

Detachable cable system for easy upgrades and replacements

Designed in Germany. Made in Ireland

Sennheiser HD 660S2 continues Sennheiser’s tradition of precision German engineering, with manufacturing carried out in Ireland to meet the brand’s high-quality standards. Every component is designed for performance, longevity, and timeless appeal, giving audiophiles peace of mind that they’re investing in a top-tier product.

Pros of Sennheiser HD 660S2

Open-Back Design delivers a wide, natural soundstage.

Deep Bass Response improved over the original HD 660S.

Balanced & Detailed Sound great for critical listening.

High Comfort with plush ear pads for long sessions.

Detachable Cables for flexibility and easy replacement.

Durable Build with premium Sennheiser craftsmanship.

Audiophile-Grade Performance at a reasonable price point.

Conclusion

The Sennheiser HD 660S2 is a refined upgrade to the classic HD 660S, offering richer bass, natural mids, and smooth treble in an open-back design that audiophiles love. With its comfort-focused build and reference-level sound quality, it’s an excellent choice for critical listening, home studios, and immersive music enjoyment. If you want a true high-fidelity experience without venturing into extremely high-end pricing, the HD 660S2 is a smart investment.

 

 

Top 5 FAQs for Sennheiser Consumer Audio HD 660S2

What’s the difference between the Sennheiser HD 660S2 and Sennheiser HD 660S2?

Sennheiser HD 660S2 improves upon the original with deeper sub-bass, vented magnet system, and airflow-optimized transducers, offering enhanced dynamic range and a more immersive listening experience.

Do I need an amplifier to use the HD 660S2?

Yes. With a 300-ohm impedance, Sennheiser HD 660S2 performs best when paired with a dedicated headphone amplifier or DAC to unlock its full potential and dynamic range.

 Is the Sennheiser HD 660S2 good for mixing and mastering?

Absolutely. Thanks to its neutral and accurate sound profile, detailed mids, and natural imaging, Sennheiser HD 660S2 is ideal for professional audio work, including mixing and mastering.

Does the Sennheiser HD 660S2 support balanced connections?

Yes, it includes a 4.4mm balanced cable and a 6.3mm standard cable, making it compatible with balanced headphone amps and high-end DACs for superior sound separation and lower distortion

Can I replace the ear pads or cables?

Yes. Both the ear cushions and cables are detachable and user-replaceable, making it easy to maintain or upgrade your headphones over time.