Sennheiser’s updated HD 660S2 headphones expand the capabilities of the 600-series family. Sennheiser responded to the hi-fi community’s feedback, crafting a headphone that balances reference-level detail with engaging frequency response. The headphone features a more dramatic listen with greater intensity from enhanced sub-bass tuning, extracting dynamic impact, and emotion from audio enthusiasts’ favorite recordings.
Improving on a beloved classic while retaining its best traits was a challenging task, starting with the lowest end of the frequency plot. The HD 660S2’s warm bass characteristics pair perfectly with its silky-smooth treble performance and trademark vocal presence, allowing the timbre and uniqueness of any instrument part to stand out.
Across the entire frequency spectrum, the HD 660S2 delivers a refined listening experience thanks to improved transducer airflow and a refined voice coil. Ultimately, listeners are treated to deeper, clearer bass without sacrificing the expansive detail the series is known for. By reducing the voice coil’s weight, impulse response improves, bringing hyper-realistic textures to the forefront of any performance reproduction. The overall experience is smoother and warmer than the original HD 660S, thanks to a tuning that reduces the distances between select peaks and troughs. The overall impedance matches that of the HD 600 and HD 650, at an audiophile-friendly 300 ohms, for punchy dynamics and impressively low distortion.
Designed in Germany and manufactured at Sennheiser’s state-of-the-art Ireland production facility, the HD 660S2 continues the series’ emphasis on quality, functional design using materials that contribute to the hi-fi experience. Plush earpads and cushy headband padding place the revised 300-ohm transducers at the optimal distance from the ear, resulting in a spacious soundstage with an abundance of detail — even for extended musical exploration. The transducer surround drops the resonant frequency from 110 Hz (original HD 660S) down to 70 Hz for hefty kick drums that move with ease. Even the outer mesh grilles are crafted to manage airflow at the ideal impedance for exquisite open-back listening sessions.
The HD 660S2 ships with two 1.8 meter (5.8 ft) user-detachable cables that terminate to 6.3 mm (1/4-inch) single-ended stereo and 4.4 mm balanced stereo jack plugs, respectively. A 6.3 mm to 3.5 mm (1/8-inch) adapter is also included, for use with popular hi-fi gear from DAC-amps, DAPs, and dedicated amplifiers such as the Sennheiser HDV 820. Distinguishing bronze accents complement the elegant jet-black finish, all of which is protected by a storage pouch.
The Sennheiser HD 660S2 is now available for pre-order and will go on sale February 21, 2023, with an MSRP of €599/$599.64 USD.
For more information, visit www.sennheiser-hearing.com.