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Sennheiser HD 660S2 Open-back Audiophile Headphone is Now Available

Sennheiser recently released its new HD 660S2 headphone, and based on its description, the HD 660S2 sounds like a warm-leaning headphone offering deep sub-bass reproduction. According to Sennheiser, it is “an upgrade for audiophiles seeking exceptional detail with engaging low-frequency performance”. The HD 660S2 features 38mm dynamic transducers and a 300 Ω impedance with an ultra-light voice coil for outstanding detail retrieval. It will start shipping on February 21st with an MSRP of $599.95. You can get one from here. For more information about its features and specifications, including the frequency graph, check out its official news release below.

Sennheiser HD 660S2 Open-back Audiophile Headphone is Now Available

Sennheiser HD 660S2 Headphones Released – Emotive Bass and Powerful Range

Sennheiser’s updated HD 660S2 expands the capabilities of the 600-series family, the longstanding benchmark for high-performance audiophile headphones. Sennheiser responded to the hi-fi community’s feedback, crafting a headphone that skillfully 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. The updated acoustics offer a delightful new way to experience music all over again.

Jermo Koehnke, Sennheiser Audiophile Product Manager:
“Our new Sennheiser HD 660S2 offers listeners what they requested most from the headphones’ predecessor,”. “With precision and power like no other and new sensitivity across all frequencies, listeners will hear details they’ve never heard before, especially at the lower end of the spectrum.”

The depth and drama audiophiles crave

​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. From thunderous timpani crescendos to pulsating EDM rises, even the most discerning audiophiles will notice the depth and nuance of low-frequency passages, adding dramatic flair to any type of music.

Sennheiser HD 660S2 diaphragm driver transducer

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 that, it 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.

Sennheiser HD 660S2 frequency graph vs hd660s

A fit for the long haul

​Designed in Germany and manufactured at Sennheiser’s state-of-the-art Ireland production facility, the HD 660S2 continues the series’ emphasis on quality and 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.

Versatile enough to connect to vintage classics and modern solutions alike, the HD 660S2 ships with two 1.8 meters (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.

Sennheiser HD 660S2 Open-back Headphone

Pricing and Availability

The Sennheiser HD 660S2 will be available to (pre) order starting February 7th and will go on sale beginning February 21st. It comes with a manufacturer’s suggested retail price of $599.95. For the latest pricing and availability, kindly follow the link below.

Sennheiser HD 660S2 open-back headphone is available on here.

Sennheiser HD 660S2 Features and Specs:

  • Intimate sound with warm, deep sub-bass reproduction
  • 38mm (diaphragm; 42mm overall) dynamic transducers matched to ultra-tight tolerances
  • 300 Ω impedance and ultra-light voice coil for outstanding detail retrieval
  • Open-back design for rich, detailed imaging and a spacious stereo field
  • Retuned transducer surround (70 Hz) for the ideal balance of impact and clarity
  • Ultra-fine steel acoustic mesh baffle and ventilated magnet negate turbulence around the transducer
  • Plush, velour ear padding and adjustable headband for long listening sessions
  • 8 Hz – 41,500 Hz frequency response
  • Includes two cables; 1.8m single-ended cable with a 6.3mm plug, and a 1.8m balanced with a 4.4mm plug
  • Includes 6.3mm to 3.5mm stereo plug adapter with strain relief
  • Total Harmonic Distortion: <0.04% (1 kHz at 100 dB) 104 dB SPL sensitivity (@1 kHz / 1 Vrms) Cinched storage pouch for low-profile storage and protection from dust Crafted at our state-of-the-art factory in Ireland
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Peter Paul
Peter is a PC enthusiast and avid gamer with several years of hands-on experience in testing and reviewing PC components, audio equipment, and various tech devices. He offers a genuine, no-nonsense perspective, helping consumers make informed choices in the ever-changing world of technology.

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