Sennheiser HD 660 S: Symphony of Precision in Sound

Sennheiser HD 660 S: Symphony of Precision in Sound

Written by Kenneth Sawyer, In Headset, Published On
December 18, 2023

With the Sennheiser HD 660 S, you will get headphones with exceptional sound quality.  Additionally, the HD 660 S boasts an excellent design. The attractive design skillfully blends modern and traditional Sennheiser components.

The open-back over-ear design provides an aesthetically beautiful, roomy, and realistic soundstage. With their silky ear cushions and well-cushioned headrest, Sennheiser ensures comfort even during long listening sessions. The Sennheiser HD 660 S is detailed in the following text.

Specifications Of Sennheiser HD 660 S

Sennheiser HD 660 S

Transducer PrincipleDynamic, open-back
Frequency Response10 Hz – 41,000 Hz
Impedance150 ohms
Sound Pressure Level104 dB (1 kHz/1Vrms)
Total Harmonic Distortion (THD)<0.04% (1 kHz, 100 dB)
Ear CouplingOver-ear
Connector6.35 mm / 1/4″ stereo plug
Transducer TypeDynamic drivers, wired
ColorMatte black

The Great Sound Quality

Sennheiser HD 660 S

A primary factor of the HD 660 S is its well-balanced sound. The lows are full-bodied and wealthy, while the highs are vivid without being abrasive, and the mids are articulate and precise. This equilibrium faithfully replicates each constituent of a composition, thereby mirroring the artist’s intention. The HD 660 S provides an audiophile-grade experience that surpasses the limitations of headphones, whether you’re listening to the expressive vocals of a singer-songwriter, a bass-heavy recording, or a classical piece.

Amplification and Adaptability:

Although numerous devices are capable of driving the HD 660 S, its maximum potential is only unlocked by a headphone amplifier. Sennheiser designed the headphones to operate optimally with high-quality audio equipment, given the importance of amplification. The HD 660 S is versatile enough to be used in both professional studios and residential listening environments. Individuals with a penchant for amp nuances will appreciate how the headphones dynamically modify in response to amplification adjustments, enabling personalized listening.

Sennheiser HD 660 S Transducers

Sennheiser HD 660 S

Sennheiser’s exceptional transducer technology powers the HD 660 S. Transducers have been set in the headphones to create the excellent audio quality of the headphones. The sound profile is perfect and precise, capturing the nuances of musical notes with unparalleled clarity. With the help of the open-back design, the headphones produce a vast and immersive ambiance. Fans of music and audiophiles who desire an accurate representation of their preferred melodies adore this feature.

Also read – Sennheiser HD 600: An Honest Review

Open-Back Design:

The open-back design of the HD 660 S improves soundstage and spatial imaging. This design allows for unrestricted airflow, which eliminates reflections and improves hearing quality. Due to the sound leakage they permit, they are ideal for peaceful areas.

Quality Construction and Comfort:

Sennheiser HD 660 S

Signature features of the Sennheiser include a comfortable harness and replaceable ear cushions upholstered in velvet. Ear receptacles that are well-fitting for extended listening sessions: The durability of the headphones under regular use is ensured by their high construction quality.

Neutral Sound Feature:

An impartial and well-balanced sound contributes to the HD 660 S’s popularity. It is, therefore, excellent for professionals and audiophiles who place a premium on acoustic accuracy. The headphones reproduce the original recording with precision, thereby illuminating intricate musical details. The HD 660 S is equipped with dedicated headphone amplification and a 150-ohm impedance. Portable devices can power it, but its performance is enhanced by a high-quality headphone amplifier, which reveals audio signal details.

Pros and Cons Of  Sennheiser HD 660 S?

Sennheiser HD 660 S

Audiophile Sound QualityLimited Noise Isolation
Comfortable DesignAmplification Recommended:
Detachable Cable
Replaceable Ear Cushions

Should I Buy  Sennheiser HD 660 ?

The Sennheiser HD 660 S is great than other headphones; it allows you to access to an audio sound where aesthetic excellence combines with perfection. The HD 660 S is at the forefront of high-fidelity audio due to its exceptional construction, acoustic engineering, and commitment to authentic sound. Those who place a premium on the auditory experience will find the Sennheiser HD 660 S to be the epitome of audio craftsmanship; it allows users to become completely engrossed in the sound.


  1. What differentiates closed-back headphones from open-back headphones?

Open-back headphones allow air and sound to pass through perforated ear cushions, resulting in a more authentic sound environment. Although closed-back headphones with airtight ear receptacles provide superior noise isolation, they may diminish the soundstage.

  1. Does an amplifier accompany the Sennheiser HD 660 S?

Although portable devices may be used to power the HD 660 S, headphone amplification enhances performance. Employ a high-quality headphone amplifier in order to optimize their capabilities.

  1. Can replacement ear coverings be obtained?

Ear cushions for the HD 660 S are interchangeable. Headphones manufactured by Sennheiser typically include replaceable components, such as ear cushions.

  1. Can the Sennheiser HD 660 S be used for gaming?

Gaming is possible with the HD 660 S, mainly when audio fidelity is critical. Open-back designs might not afford players the desired level of seclusion and immersion.

  1. Are headphones suitable for use in noisy environments?

 The uncovered rear of the HD 660 S allows ambient noise to enter and exit. They function optimally in calm, non-isolating environments.

  1. Can cables be separated?

The HD 660 S features detachable cables for portability and ease of replacement. A wide range of adapters for headphone jacks is compatible with the 6.35mm stereo connector.

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