Sennheiser HD 660S review

The Sennheiser HD 660 S is a high-end open-back headphone designed for audiophiles seeking superior sound quality and comfort. It offers a balanced and natural sound with detailed bass, clear mids, and smooth highs. The open-back design enhances the soundstage, providing a spacious and immersive experience. However, its analytical sound may not appeal to those preferring a more exciting or bass-heavy profile.

Constructed with premium materials, the HD 660 S boasts excellent build quality, though its non-foldable design and non-detachable cable may limit portability. As a wired headphone, it doesn't require charging, which is convenient for uninterrupted listening. It's not suitable for noisy environments due to sound leakage and lack of noise isolation.

While lacking advanced features, the HD 660 S excels in sound performance. Its understated design and included accessories, such as a hard-shell case and detachable cable, add value. Compared to competitors, it offers a balanced sound, standing out for its detail and accuracy. Overall, it's a strong choice for those prioritizing sound quality.

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If you like this review, you might also like our review on the Sennheiser HD 490 Pro or Sennheiser RS 175 or Sennheiser HD 620S.

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The Sennheiser HD 660S is a pair of headphones that audiophiles have been buzzing about. Known for its stellar sound quality, this model is a hot topic for anyone serious about their audio experience. Whether you're a music producer or just a casual listener who appreciates high-quality sound, these headphones promise to elevate your audio game.

These cans are the follow-up to the well-loved HD 650, and they aim to deliver an even richer sound profile. Sennheiser has a solid reputation for crafting headphones that are both durable and performance-driven, and the HD 660S is no exception. However, they do come with a few quirks that might not suit everyone. So, are these headphones the right fit for you? Let's dig in and find out what makes them tick.

The design and build quality of the Sennheiser HD 660S is straight-up impressive. These headphones are crafted with a sleek, minimalistic design that stands out without being too flashy. They sport a classic black finish with silver accents, making them look as professional as they sound.

One of the first things you'll notice is the premium materials used throughout. The headband is reinforced with metal, providing durability while still being flexible enough to fit comfortably. The ear cups are made of high-quality plastic, which keeps the headphones lightweight yet sturdy. This combination ensures that they are built to last, even with daily use.

The ear pads are covered with a plush velour material, which feels soft against the skin. This choice is not just for comfort but also helps with breathability, making long listening sessions a breeze. However, if you're someone who treasures a more luxurious feel, you might find the velour a tad less premium than leather alternatives.

While the overall build is solid, the headphones do not fold, which can be a bit of a letdown for those looking for something more portable. They are designed more for home or studio use rather than being travel-friendly.

The open-back design is another standout feature, contributing to a more natural soundstage. However, it means that they aren't ideal for noisy environments or if you need to keep your music to yourself. Sound leakage is something to keep in mind, especially if you're around others who might not appreciate your taste in tunes.

In summary, the Sennheiser HD 660S boasts a robust build with a focus on durability and comfort. While they might not be the best choice for on-the-go use due to their size and open-back design, they are a fantastic option for anyone prioritizing sound quality and comfort in a home or studio setting.

The sound performance of the Sennheiser HD 660S is something that will make any audiophile's ears perk up. These headphones are built to deliver an incredibly detailed and natural sound experience. Thanks to their open-back design, they offer an expansive soundstage that makes you feel like you're sitting in a live concert. The separation of instruments is clear, and you can easily distinguish between different elements of the music.

One of the most striking features is the clarity of the mids. Vocals are crisp and lifelike, making them perfect for genres like jazz and classical music. The highs are smooth without being harsh, so even at higher volumes, they remain pleasant to the ears. Bass lovers might find the low end a bit restrained compared to more bass-heavy models, but it's tight and precise, making it ideal for those who prefer a more balanced sound signature.

However, if you're into genres that rely heavily on thumping bass, these might not fully satisfy your cravings. The HD 660S focuses more on delivering an authentic and accurate audio experience rather than artificially boosting bass frequencies.

Another point worth mentioning is the low impedance of 150 ohms, which makes these headphones relatively easy to drive. While they sound great with most devices, pairing them with a good quality amplifier can really make them shine, revealing nuances in tracks you might have missed before.

Overall, if you're looking for headphones that prioritize sound fidelity and detail over exaggerated bass, the HD 660S could be your perfect companion. Just remember, they're designed for those who appreciate a more refined listening experience.

The comfort and fit of a pair of headphones can make or break your listening experience, and the HD 660S does a pretty solid job in this department. The ear cups are generously padded with soft velour cushions, which feel gentle against the skin, even during extended listening sessions. If you've ever worn headphones that felt like a vice on your head, you'll appreciate the moderate clamping force here. It's snug enough to stay put but not so tight that it becomes uncomfortable.

The adjustable headband is also well-padded, distributing weight evenly across the top of your head. This helps reduce pressure points, making long listening sessions more enjoyable. However, if you have a particularly large head, you might find the fit a bit tight initially. Don't worry, though; the band tends to loosen up a bit over time.

One aspect that might not be everyone's cup of tea is the open-back design. While it enhances soundstage and audio quality, it does mean that sound leaks out and ambient noise can seep in. This design isn't ideal if you're planning to use them in noisy environments or need privacy. But in a quiet room, they offer an immersive listening experience like no other.

Overall, if you're looking for headphones that provide comfort without compromising on fit, the HD 660S is a great choice, especially for home use. Just keep in mind the open-back nature if you plan to use them in varied settings.

The connectivity options on the Sennheiser HD 660S are straightforward, as these headphones are designed for audiophiles prioritizing a direct listening experience. The HD 660S uses a wired connection to ensure stable, high-quality audio.

The headphones include two detachable cables: one with a 6.35mm stereo plug and another with a 4.4mm Pentaconn balanced plug. A 6.35mm-to-3.5mm adapter is also provided for compatibility with standard devices like smartphones or laptops.

Regarding compatibility, the HD 660S works with any device featuring a headphone jack. However, its 150-ohm impedance means optimal performance requires pairing with a dedicated headphone amplifier or high-quality DAC, particularly for lower-powered devices.

While lacking wireless connectivity, the HD 660S delivers a robust wired solution tailored for audiophiles. Its focus on sound fidelity over convenience makes it ideal for listeners prioritizing audio quality.

When you crack open the box of the Sennheiser HD 660S, you're greeted with a pretty straightforward setup. Sennheiser keeps it simple, focusing on the essentials without any unnecessary frills. Here's what you can expect to find:

• Headphones: Of course, the star of the show is the headphones themselves, neatly packed and ready to deliver top-notch sound.
• Detachable Cables: You get two detachable cables. One is a 6.35mm (1/4") cable pre-attached for traditional stereo setups, and there's also a balanced 4.4mm Pentaconn cable included. This gives you flexibility depending on your audio gear.
• Adapter: A 6.35mm (1/4") to 3.5mm adapter is included, which is handy if you're planning to use these headphones with portable devices like smartphones or laptops.
• Manual: A user manual is included to help you get started, although the setup is pretty intuitive.

One thing to note is the inclusion of a storage box rather than a carrying case or pouch. While the HD 660S are designed for home or studio use, the provided storage box helps keep your gear pristine. Overall, the box contents are practical, with a focus on delivering high-quality audio right out of the gate.

When it comes to high-end headphones, the Sennheiser HD 660S isn't alone in the market. Let's see how it stacks up against some of its main competitors.

1. Beyerdynamic DT 1990 Pro: The DT 1990 Pro is a strong contender with its robust build and detailed sound. It offers a more neutral sound profile, which is fantastic for professionals needing accuracy for mixing and mastering. However, it can be a bit too analytical for casual listeners. The HD 660S, on the other hand, provides a warmer and more engaging sound, making it more suitable for music enjoyment.
   
   
2. Audeze LCD-2: Known for their planar magnetic technology, the LCD-2 offers a rich and immersive sound experience. It excels in bass depth and soundstage but comes at a higher price point. Additionally, the LCD-2 is notably heavier, which may not be ideal for extended listening sessions. The HD 660S is lighter and more comfortable, making it a better option for long-term use.
   
   
3. AKG K712 Pro: This model is renowned for its expansive soundstage and clarity. It's great for genres like classical and jazz, where instrument separation is key. However, the bass response might feel lacking to some users. The HD 660S offers a more balanced sound with a slight emphasis on the mids, which can be more versatile across different music genres.
   
   
4. Philips Fidelio X2HR: For those on a budget, the Fidelio X2HR provides an excellent alternative with its impressive sound quality at a lower price. It delivers a punchy bass and wide soundstage, but its build quality isn't on par with the HD 660S. If durability and premium materials are important, the HD 660S is the better choice.

Overall, while the Sennheiser HD 660S faces stiff competition, it holds its own with a blend of comfort, sound quality, and build that appeals to both audiophiles and casual listeners alike. Each competitor has its unique strengths, and the choice often boils down to personal preference and specific needs. But if you're looking for a balanced and immersive listening experience, the HD 660S is definitely worth considering.

When it comes to price and value, the Sennheiser HD 660S sits in the higher range, which might make you wonder if it's worth the investment. Priced around the mid to high-end spectrum for audiophile headphones, these aren't your bargain-bin option. However, you're paying for serious quality here.

The sound clarity and detailed performance of the HD 660S truly stand out, making it a worthwhile purchase for those who value exceptional audio experiences. If you're a music enthusiast or someone who spends significant time listening to high-resolution tracks, the investment can be justified. The superior sound quality, combined with a solid build, offers a package that's hard to beat.

However, if you're looking for casual listening or something portable, you might find the price steep. More affordable options suit less demanding needs. But for those prioritizing sound fidelity and comfort, the HD 660S pays off long-term.

It's worth noting that while these headphones excel in sound, they lack modern features like active noise cancellation or wireless connectivity, available in similarly priced competitors. If those features are priorities, explore other options.

In summary, the Sennheiser HD 660S offers substantial value for those who appreciate high-quality audio and are willing to pay for it. The price reflects premium quality and performance, making it a strong contender for anyone serious about sound.

Video by: The Headphone Show

In conclusion, the Sennheiser HD 660S delivers an impressive listening experience that will satisfy many audiophiles. Its sound performance is outstanding, offering a rich and immersive audio profile. The headphones excel in providing clear and detailed sound, making them a great choice for anyone who wants to experience music in its full glory. However, they are not without their drawbacks. The lack of noise cancellation might be a dealbreaker for those who frequently listen in noisy environments. Additionally, the open-back design, while beneficial for sound quality, may not be ideal for everyone, especially if you need to keep your music to yourself. The build quality is solid, and they feel durable, but some users might find them a bit too bulky for on-the-go use.

Their comfort is generally good, though prolonged use might require occasional adjustments for optimal fit. When considering the price and value, these headphones sit in a premium segment. They are a worthwhile investment for those who prioritize exceptional sound quality and are willing to overlook some of the minor limitations. Overall, they are a strong contender in the high-end headphone market, though it's always wise to weigh your personal needs and preferences before making a purchase.

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