Sennheiser HD 660S2 Wired Over-Ear Headphones

Sennheiser HD 660S2 Open-Back Headphones – Deep, Detailed Sound for True Audiophiles

Elevate your listening experience with the Sennheiser HD 660S2 open-back over-ear headphones, a powerful upgrade to the iconic HD 660S. Built for passionate audiophiles, the HD 660S2 delivers enhanced sub-bass response, refined acoustic performance, and superior comfort for extended sessions.

Whether you're exploring delicate classical compositions or bass-rich electronic music, the HD 660S2 lets you hear and feel every detail, with exceptional clarity and emotional depth.

Discover More Depth in Every Note

The HD 660S2 is engineered for immersive, high-fidelity sound, with noticeable improvements in low-end performance. Its updated design doubles the sound pressure at sub-bass frequencies, allowing you to clearly hear the lowest piano tones and the deepest bass drums without compromising balance or natural tonality.

By extending the bass response while preserving midrange accuracy and treble clarity, these headphones create a deeper, more spacious soundstage. Highs sound more brilliant, and the overall experience feels more dynamic and emotionally engaging.

Premium Components for Audiophile-Grade Sound

At the core of the HD 660S2 are 38mm dynamic transducers surrounded by an optimized steel mesh baffle, designed to increase acoustic pressure in the low end while maintaining natural resonance.

Improved transducer airflow reduces unwanted air leakage, boosting bass precision and impact. The use of lightweight Duofol aluminum voice coils, now with a higher 300-ohm impedance, provides better electrical damping and greater detail retrieval. This revised coil also improves impulse response and transient accuracy, giving you crisp, clean sound with every note.

The result is more powerful bass, smoother treble, and extraordinary overall balance.

Built for Long Listening Sessions

Comfort is just as important as sound, and the HD 660S2 delivers on both fronts. The open-back design offers natural airflow and a wide, open soundstage, while the ultrasoft velour earcups and ergonomic headband ensure a secure, comfortable fit for long hours of uninterrupted listening.

With a low total weight and precisely engineered clamping force, these headphones stay comfortable even during extended use. The Irish-made build quality ensures durability, attention to detail, and a premium feel throughout.

A Modern Take on Legendary Sound

Drawing inspiration from classic models like the HD 600, HD 650, and HD 660S, the HD 660S2 continues Sennheiser’s legacy of natural, neutral sound reproduction. The revised coil design mirrors the 300-ohm impedance of its legendary predecessors, while introducing upgrades for enhanced bass depth, speed, and accuracy.

A more compliant surround lowers the resonant frequency to 70 Hz, contributing to even tighter, more extended bass with incredible resolution. This modern tuning brings new life to the iconic Sennheiser HD 600 series sound signature.

Accessories and Connectivity

The HD 660S2 includes everything you need for a flexible listening experience. It comes with:

• Two detachable cables: one with a 1/4-inch (6.3 mm) unbalanced plug and another with a 4.4 mm balanced plug

• 1/4-inch to 3.5 mm adapter

• Protective storage pouch

These options make it easy to connect to a wide range of headphone amps, DACs, and high-end audio players.

Why Choose the Sennheiser HD 660S2?

If you're looking for audiophile open-back headphones with extended bass, natural imaging, and all-day comfort, the HD 660S2 stands out as one of the best in its class. It blends emotionally rich sound, engineering precision, and ergonomic design into one compelling package.