The Sennheiser HD 660S2 – Diving Deeper Into Legendary Sound

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. 

“Our new Sennheiser HD 660S2 offers listeners what they requested most from the headphones’ predecessor,” says  Jermo Koehnke, Sennheiser Audiophile Product Manager. “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.”

Image source: Sennheiser

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. 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. 

Image source: Sennheiser

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, 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 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.

Image source: Sennheiser

Pricing and availability 

The Sennheiser HD 660S2 will be available at Sennheiser Consumer Hearing webstore and authorised retailers at MSRP SGD899 come 24 March 2023. Check it out at the Sennheiser Consumer Hearing Webstore.

I’ve had the chance to try out the Sennheiser HD660S2 at CanJam over the weekend and I was blown away by the amazing soundstage that the HD660S2 had. It had one the most amazing clarity and vibrancy of all the audio products that I tried while I was there. It also won’t suck your wallet into a blackhole as compared to the others. If you ever get the chance to try one for yourself, I highly recommend you to try. This is my new benchmark for all headsets in the future.

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