Sennheiser HD 660 S2

Open Hi-Fi Headphone for Discerning Music Enjoyment!

The Sennheiser HD 660S2 is an open, over-ear Hi-Fi headphone for discerning listeners who demand high resolution, natural spatial imaging and controlled, deep bass reproduction. With premium dynamic driver technology, an open acoustic design and a 300 Ohm impedance, this model is engineered for top-tier playback on quality headphone amplifiers, DACs and Hi-Fi components. The HD 660S2 pairs precision with a musical tuning to deliver an intense, authentic and long-lasting listening experience at home.

Finely Tuned Sound With High Resolution

The HD 660S2 was developed for high-end music reproduction and impresses with a precise, clean and balanced voicing. The wide frequency range of 8 - 41,500 Hz enables detailed reproduction from deep bass fundamentals to the finest treble textures. Voices, instruments and dynamic shifts are clearly resolved and richly nuanced. Thanks to the optimized driver tuning, the sound never comes off as analytically cold; instead it’s precise and musical.

Open Design for Natural Spatial Imaging

The open construction supports an airy, expansive and realistic soundstage. Individual instruments and voices are reproduced very naturally in the stereo image. Especially with high-quality productions, live recordings, classical, jazz, rock or acoustic music, the headphone reveals its strengths in spatial layering and authentic reproduction of fine details. The open design also reduces disturbing enclosure resonances and promotes a free, uncolored sound.

Powerful Low-End and Controlled Dynamics

A key characteristic of the HD 660S2 is its extended low-frequency response. Compared with traditionally tuned open headphones, this model delivers especially deep and controlled bass without masking mids or highs. The result is a punchy, precise and cleanly structured sound character that conveys music with emotional impact and high fidelity.

Designed for High-End Hi-Fi Systems

With a 300 Ohm impedance, the HD 660S2 is aimed at users who will run it from powerful headphone amplifiers, DAC/headphone amps, high-end receivers or stationary audio sources. In that environment the headphone displays its sonic qualities with particular authority, delivering fine detail, dynamic range and control across the entire frequency spectrum.

Comfort for Extended Listening Sessions

The HD 660S2 remains comfortable even during long listening sessions. Large ear cups, soft velour ear pads and a well-balanced headband provide a comfortable fit. That makes the headphone ideal for extended music sessions, focused listening and enjoyable evenings with high-quality recordings.

Enjoy Your Music With Natural Spatial Imaging and the Finest Resolution!