Sennheiser HD 660S2 Over-Ear Headphones

Sennheiser HD 660S2 Over-Ear Headphones — image 1
Sennheiser HD 660S2 Over-Ear Headphones — image 2
Sennheiser HD 660S2 Over-Ear Headphones — image 3
Sennheiser HD 660S2 Over-Ear Headphones — image 4
Sennheiser HD 660S2 Over-Ear Headphones — image 5
Sennheiser HD 660S2 Over-Ear Headphones — image 6
Sennheiser HD 660S2 Over-Ear Headphones — image 7
Sennheiser HD 660S2 Over-Ear Headphones — image 8
Sennheiser HD 660S2 Over-Ear Headphones — image 9
Sennheiser HD 660S2 Over-Ear Headphones — image 10
Sennheiser HD 660S2 Over-Ear Headphones — image 11
86%
94%
Sound Quality
92%
Bass Performance
88%
Comfort for Extended Use
85%
Build Quality
70%
Noise Isolation
80%
Impedance Compatibility
90%
Design & Aesthetics
78%
Durability
86%
Fit & Comfort for Long Sessions
89%
Connectivity
92%
Value for Money
84%
User Experience
More

Overview

The Sennheiser HD 660S2 Over-Ear Headphones are designed for audiophiles seeking an immersive listening experience. These over-ear headphones feature an open-back design that creates a natural and expansive soundstage. The updated model in the HD 660 series offers significant improvements in bass performance, making it ideal for users who value deep, resonant lows alongside crystal-clear mids. Whether you're enjoying classical music, jazz, or modern electronic, these headphones are tailored to deliver a precise and balanced sound. With comfort-focused features, they provide a premium option for serious listeners looking for high-fidelity audio.

Features & Benefits

These audiophile headphones come equipped with 42mm airflow-optimized transducers that ensure accurate sound reproduction. The open-back design enhances the listening experience, allowing sound to flow freely for an immersive and expansive feel. Additionally, the 300-ohm impedance offers high sensitivity, making them compatible with a variety of high-end audio equipment. The wide frequency range of 8 Hz to 41,500 Hz means they capture the finest details across the full spectrum of sound. The plush ear pads provide exceptional comfort, ensuring that users can enjoy long listening sessions without discomfort.

Best For

The HD 660S2 headphones are best suited for audiophiles who demand precise sound and rich, full-range audio. They're also an excellent choice for music producers and sound engineers who rely on accurate, high-quality sound for mixing and mastering. With their ergonomic over-ear design, these headphones are ideal for long listening sessions, making them a top pick for users who value comfort. Those with high-end audio setups, such as DACs and amplifiers, will benefit most from the headphones’ 300-ohm impedance, which optimizes performance when paired with powerful audio sources.

User Feedback

Users are consistently impressed with the deep bass response and the clarity of midrange frequencies, which makes these headphones perfect for a wide range of genres. The comfortable design is another highlight, with many mentioning that they remain comfortable even during extended listening periods. However, some users note that the open-back design can be less effective in noisy environments, as it doesn't offer strong noise isolation. Additionally, a few users find that the 300-ohm impedance requires a powerful audio source to fully realize the headphones' potential, which could be a consideration for those without high-end equipment.

#Over-Ear Headphones
#Headphones & Earbuds
#Headphones, Earbuds & Accessories
#Electronics

Pros

  • The open-back design delivers a natural, immersive sound experience with clear highs and deep bass.
  • Comfortable plush ear pads make this headphone ideal for long listening sessions without discomfort.
  • The 300-ohm impedance ensures high sensitivity and compatibility with high-end audio equipment.
  • Wide frequency response (8 Hz - 41.5 kHz) provides detailed sound reproduction across all audio ranges.
  • Enhanced sub-bass performance offers a rich, deep low-end that audiophiles will appreciate.
  • The detachable cable design allows for easy replacement and customization based on user preferences.

Cons

  • The open-back design means sound leakage, making these headphones less ideal for use in noisy environments.
  • The 300-ohm impedance requires a powerful audio source, limiting performance with basic devices.
  • Not the best choice for those seeking portable headphones, as they are not compact or lightweight.
  • The headphone's high sensitivity may lead to distortion if not paired with high-quality audio gear.
  • Some users may find the open-back design uncomfortable for public or shared spaces.
  • Lack of active noise cancellation makes it unsuitable for use in loud or crowded areas.

Ratings

After analyzing verified user feedback from multiple platforms and languages worldwide, the scores for the Sennheiser HD 660S2 Over-Ear Headphones reflect genuine user experiences. We filtered out any spam, bot-generated, incentivized, and exaggerated reviews to ensure an accurate picture of the product. Both strengths and pain points are highlighted, offering a well-rounded view of how this headphone performs in real-world conditions, based on extensive user input across diverse sources.

Sound Quality
94%
Users rave about the exceptional sound reproduction provided by these audiophile headphones. The natural soundstage, combined with clear mids and deep bass, makes them ideal for serious music lovers seeking accuracy and detail in their audio experience. Many mention the well-balanced output that handles everything from classical music to modern genres with ease.
While the sound quality is impressive, some users feel the bass could be more impactful for certain types of music, like electronic or hip-hop. A few listeners also note that the open-back design might not suit everyone, particularly those who enjoy a more pronounced bass boost or noise isolation.
Bass Performance
92%
The deep bass performance of this headphone is often highlighted as a standout feature. Many users appreciate how the sub-bass frequencies are rich and detailed without overpowering the rest of the sound spectrum. This makes it particularly suitable for audiophiles who enjoy a clear, controlled low-end that doesn't compromise clarity.
A handful of users find that while the bass is present and detailed, it may not be as punchy as they would prefer for more bass-heavy music genres. Additionally, the 300-ohm impedance may require a higher-quality amplifier to reach the full bass potential, which can be inconvenient for those without premium audio equipment.
Comfort for Extended Use
88%
Many users highlight the comfort of these over-ear headphones during long listening sessions. The plush ear pads and breathable design provide a snug fit that prevents discomfort, even after hours of use. The lightweight build and ergonomically designed headband also contribute to the overall comfort, making these headphones a favorite for extended listening periods.
While most find them comfortable, a few users mention that the fit may not be perfect for everyone. People with larger head sizes or those who wear glasses may find the headphones a bit too tight around the ears. The open-back design also allows for some external noise, which could be distracting in noisy environments.
Build Quality
85%
The build quality of these audiophile headphones is solid and feels durable, with a high-end finish that reflects their premium pricing. Users appreciate the combination of metal and plastic elements, giving them a sturdy but not overly heavy feel. The detachable cable is also a practical feature, offering flexibility and reducing the risk of wear over time.
Despite the generally positive feedback on build quality, some users report that the headphones feel a little fragile, especially around the headband. A few reviewers also noted that the ear pads, while comfortable, might show signs of wear after extended use, particularly with frequent adjustments.
Noise Isolation
70%
30%
The open-back design of these headphones provides a wide soundstage and an immersive listening experience. For users who prioritize a natural, airy sound, this design is an advantage, providing a more open, less confined feel compared to closed-back headphones.
However, the open-back design significantly reduces noise isolation, making these headphones less ideal for use in noisy environments. Users in louder spaces or public areas may find themselves distracted by ambient noise, which could detract from the overall listening experience.
Impedance Compatibility
80%
20%
With a 300-ohm impedance, these headphones are designed to work well with high-end audio equipment. Many audiophiles appreciate the headphone's ability to provide detailed sound when paired with powerful amplifiers and DACs. The high impedance allows for better sensitivity, ensuring these headphones can reach their full potential when driven by the right gear.
A downside for some users is the need for a powerful amplifier to drive the 300-ohm impedance. Without the right audio source, the headphones may not reach their full potential, leading to a less dynamic sound. Some users mention that they had to upgrade their audio equipment just to get the most out of these headphones.
Design & Aesthetics
90%
The design of these headphones is sleek and modern, with a minimalist look that appeals to those who value aesthetics. The black color scheme, paired with the open-back ear cups, gives them a professional yet stylish appearance. Many users find the overall design to be both attractive and practical for home listening setups.
While the design is generally well-received, some users find the aesthetics too basic for a product at this price point. A few also note that the size of the ear cups may be too large for smaller heads, which can make the headphones feel bulkier than expected.
Durability
78%
22%
The headphones are generally well-built, with durable materials that hold up to regular use. The detachable cables add to their longevity, allowing users to easily replace or upgrade the cables if needed. Many users feel confident that these headphones will last for a long time with proper care.
Some users report concerns about the long-term durability of certain parts, particularly the headband and ear pads. After several months of use, a few users noticed slight wear and tear, which could be a concern for those looking for a pair that will hold up under frequent adjustments.
Fit & Comfort for Long Sessions
86%
The lightweight nature of these over-ear headphones, along with the plush, breathable ear pads, ensures comfort during extended listening. Many users who enjoy long sessions find the HD 660S2 comfortable to wear for several hours at a time without feeling too much pressure or heat around the ears.
Despite the overall comfort, a few users with larger heads or those who wear glasses feel that the headphones are too tight. This can cause discomfort over time, particularly during prolonged listening sessions. The open-back design also contributes to a slight sense of exposure to external sounds.
Connectivity
89%
The detachable cables and multiple connector options (6.3mm and 4.4mm) make it easy to integrate these headphones into various audio setups. Whether used with an amplifier or portable DAC, users appreciate the flexibility of connecting to different devices and configurations. The secure, high-quality connectors also ensure a stable connection for uninterrupted listening.
Some users feel that the lack of wireless connectivity is a drawback, especially for those looking for a more portable solution. Additionally, the headphone's design does not include any in-line controls, which may be inconvenient for users who prefer to adjust volume or playback directly on the headphones.
Value for Money
92%
These headphones offer exceptional sound quality and comfort, which many users feel justifies the price. The combination of high-end audio performance, durable build, and sleek design makes them a great investment for serious audiophiles. Users often mention that while they are on the pricier side, the value they provide is undeniable for those seeking top-tier sound.
For some, the price may be a bit high compared to other headphones with similar features. A few users feel that, while the sound quality is outstanding, the headphones could be more versatile for the price, especially considering the lack of wireless features and noise isolation.
User Experience
84%
Many users mention the enjoyable experience when using these headphones, with seamless integration into their audio setups. The comfort and sound quality are frequently cited as key factors that enhance their overall satisfaction, particularly for those who value precision and clarity in their listening experience.
However, a few users note that getting the most out of the headphones requires additional equipment like an amplifier or DAC. The open-back design also limits their use in noisy environments, and some users prefer headphones with more isolation for better focus during listening sessions.

Suitable for:

The Sennheiser HD 660S2 Over-Ear Headphones are ideal for audiophiles, music producers, and sound engineers who demand precise, high-fidelity sound for both casual and professional use. Their open-back design and accurate sound reproduction make them an excellent choice for listeners who value clarity across all frequency ranges. With a wide frequency response and enhanced sub-bass performance, they are perfect for extended listening sessions, especially for users who have high-end audio gear like DACs and amplifiers. Whether you're mixing tracks in a studio or simply enjoying an immersive listening experience at home, this headphone excels in providing detail and depth that will satisfy the most discerning ears.

Not suitable for:

However, the Sennheiser HD 660S2 may not be suitable for users who need headphones with strong noise isolation or portability. The open-back design allows for significant sound leakage, which could be distracting in noisy environments or for those seeking privacy during use. Additionally, the 300-ohm impedance requires a powerful audio source, making it less ideal for casual listeners who want a quick plug-and-play experience with mobile devices. Users who do not have access to high-quality amplifiers or audio equipment might find the headphone underperforming unless paired with the right setup. It's also not the best option for people looking for a lightweight, travel-friendly option.

Specifications

  • Impedance: The headphones feature a 300-ohm impedance, ideal for high-end audio gear and ensuring high sensitivity for accurate sound reproduction.
  • Transducer: Equipped with 42mm airflow-optimized transducers, these headphones deliver precise and natural sound with improved accuracy across frequencies.
  • Frequency Response: The headphones offer a wide frequency response range from 8 Hz to 41.5 kHz, ensuring detailed sound across both low and high frequencies.
  • Design: These headphones feature an open-back design, providing a natural, immersive listening experience with a spacious soundstage.
  • Headphone Type: These are over-ear headphones, designed for comfort with plush ear pads for long listening sessions.
  • Cable: The headphones come with a detachable cable, offering flexibility and easy replacement if needed.
  • Connector: They support connectors of 6.3mm and 4.4mm, allowing compatibility with high-end audio equipment.
  • Weight: The headphones weigh 10.6 oz, offering a balanced design that is comfortable for extended use without feeling too heavy.
  • Color: The headphones come in a classic black finish, providing a sleek and professional aesthetic.
  • Comfort Features: These headphones feature plush ear pads and a breathable design, ensuring comfort during extended listening sessions.
  • Use Case: Ideal for audiophiles, music producers, and sound engineers, the headphones are suited for critical listening and professional audio work.
  • Sound Quality: The headphones are optimized for deep bass and clear midrange frequencies, offering rich low-end performance without compromising clarity.
  • Noise Isolation: Due to their open-back design, these headphones offer minimal noise isolation, which is better for home or studio environments rather than public settings.
  • Power Requirements: With a 300-ohm impedance, these headphones require a powerful source, such as an amplifier or DAC, to reach their full potential.
  • Durability: The detachable cable adds durability by allowing for easy replacement, reducing the risk of wear and tear on the main unit.
  • Packaging: The headphones come in a well-protected box with an included cable, offering both safety during shipping and an easy unboxing experience.
  • Compatibility: These headphones are compatible with high-end audio equipment such as DACs, amplifiers, and professional studio gear.

FAQ

The Sennheiser HD 660S2 features an open-back design, offering a natural, immersive sound experience with a focus on deep bass and clear midrange frequencies. Its 300-ohm impedance ensures compatibility with high-end audio equipment, making it ideal for audiophiles seeking high-fidelity sound reproduction.

To get the best performance, connect the HD 660S2 to a high-quality audio source, like a dedicated headphone amplifier or DAC, due to its 300-ohm impedance. Avoid using basic devices like smartphones without a powerful audio source to ensure it reaches its full potential. Ensure you're listening in a quiet, noise-free environment to fully appreciate the open-back design.

While the Sennheiser HD 660S2 can be used with most devices that have a 3.5mm or 6.3mm output, their 300-ohm impedance makes them less ideal for basic devices like phones or laptops without additional amplification. For optimal performance, use them with a dedicated headphone amplifier or DAC.

Yes, the HD 660S2 features a detachable cable, which allows for easy replacement or customization. This feature also ensures that you can swap out cables for different connectors depending on your equipment or preferences.

The HD 660S2 is designed primarily for music lovers and audiophiles, with a focus on natural sound and accurate reproduction. While they can be used for gaming or movie watching, their open-back design may not be ideal in noisy environments, and the soundstage may not be as immersive for gaming compared to other models designed specifically for that purpose.

To maintain the HD 660S2, keep the ear pads clean and free from dust by using a soft cloth. Avoid pulling or twisting the cables, as the detachable nature makes it easy to replace them if damaged. Store them in a protective case when not in use to prevent accidental damage.

Yes, these over-ear headphones are well-suited for professional audio work. The 42mm airflow-optimized transducers and wide frequency response provide precise, accurate sound reproduction, making them ideal for mixing, mastering, or critical listening in a professional studio environment.

The open-back design allows sound to leak both in and out, which means these headphones are not ideal for use in noisy environments or for private listening in public spaces. They also offer limited noise isolation, making them unsuitable for use in loud areas or for commuting.

The HD 660S2 is known for its exceptional comfort. The plush ear pads and over-ear design are specifically designed for long listening sessions, ensuring that users can enjoy hours of use without discomfort. The breathable design also helps to keep your ears cool during extended periods of wear.

The HD 660S2 features enhanced sub-bass performance that delivers richer low-end frequencies compared to many other audiophile headphones. This makes it ideal for users who appreciate deep, impactful bass without sacrificing the clarity of midrange and treble frequencies.