Sennheiser - HD 660S2 Wired Over-the-Ear Headphones - Black
Customers are saying
Customers admire the jaw-dropping sound quality of these headphones, which is frequently highlighted as a standout feature. Users also appreciate the high-quality, upgraded bass and the overall comfort provided during extended listening sessions. Additionally, many find the open-back design to be a worthwhile experience despite any initial hesitation.
Natural, relaxed, high-fidelity sound with extra sub bass
Optimized surround and diaphragm with voice coil with 300-ohm impedance
Exceptional comfort and build quality
The open-back design offers exceptional breathability for long listening sessions
38mm high-performance transducers built in Ireland
Steel mesh damping follows the driver’s geometry to control air displacement, while the magnetic yoke includes milled air vents for optimal ventilation, which minimizes distortion
Frequency response
8 Hz - 41,500 Hz
Detachable cables
6.3mm & 4.4mm, + 3.5mm adapter. 1.8m cable length for comfortable desktop use
- Sound ModeStereoConnection TypeWiredCarrying CaseNoHeadphone FitOver-the-EarAdjustable HeadbandNo
Reviews
Rating 4.7 out of 5 stars with 46 reviews
- Sound Quality (33)
- Bass (8)
- Comfort (7)
- Open Back (4)
Customer Images
The vast majority of our reviews come from verified purchases. Reviews from customers may include My Best Buy members, employees, and Tech Insider Network members (as tagged). Select reviewers may receive discounted products, promotional considerations or entries into drawings for honest, helpful reviews.
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Despite the HD 660S’s standing as one of the world’s popular audiophile headphones, some customers nevertheless wanted one very specific enhancement: even deeper bass. Because whether it’s a thunderous crescendo of timpani or the pulsating beat of electronic dance music, there is nothing like accurate, powerful sub bass to infuse your listening with drama. Audiophiles—and anyone looking for comfortable, non-fatiguing, high-end headphones—can now get even more impact and emotion from the HD 660S2. The headphone’s warm, relaxed tone is reflected by their timeless styling with elegant bronze accents. With its open-back design and outstanding comfort, the HD 660S2 is also destined to be a favorite for long listening sessions. This version builds on all the strengths of its formidable predecessor. The same world-class precision and resolution still let you pick out individual instruments like with no other headphone. Or experience the joy of discovering sonic details in recordings you’ve known for years—now underscored with more and deeper low end. Indeed, the standard-setter for extended listening has now become the standard-setter for extended bass as well. Enhancing this heralded audio design without detracting from its many strengths was, however, a daunting task. So, our engineers set out to systematically identify and exploit every opportunity in their quest to improve on the acclaimed HD 660S design. We adjusted the compliance of the surround, for instance, dropping the resonance frequency to 70 Hz. Considerable effort went into optimizing the airflow around the transducer. The coil in the HD 660S2 has also been revised to match the legendary HD 600 & 650, resulting in an impedance of 300 ohms. The coil offers a high magnetic force and electrical damping for a clean impulse response. It also increases sensitivity over the entire frequency spectrum by using the magnet’s air gap more efficiently. Taken together, these efforts and more have paid off in spades. Sound pressure at the lowest octaves has doubled. Now, you can feel the music more than ever before—with all the depth and weight that ultra-low frequencies invoke. The lowest A on the piano (27.5 Hz) or the pounding root note of a bass drum (45-60 Hz) are just as big, expansive, and imposing as if they were live. The unique combination of impactful bass combined with the warm tuning and smooth treble will be a revelation for audiophile listeners. It’s an even better way to lose yourself in comfortable, non-fatiguing, high-end sound—while feeling its full low-end power.
The HD 650 has all of the perks of a high-performance sports car and none of the quirks. This open-back headphone is beloved by audiophiles for its musical, non-fatiguing sound while still offering intimate levels of detail. Upon the first note, your favorite tracks reveal their true potential, and each moment of that performance becomes an opportunity to react all over again. For the hi-fi enthusiast that prioritizes engaging sound quality the HD 650 is an instant upgrade. The HD 650’s signature sound starts with our in-house acoustics. Audiophiles know that the best components perform at their peak when nothing stands in their way. The 42mm transducer deploys a 38mm diaphragm with aluminum voice coil specifically tuned for extended, critical listening: overall treble and low-frequency presence are effortless while midrange is reproduced with lifelike composure—none sacrificing their organic roots to get there. Made in Ireland at our state-of-the-art production facility, the HD 650 delivers more: more details discovered, more musicality, and definitely more time for blissful listening.
Enjoy your music on a completely new level. An intimate, relaxed sound signature combines with outstanding precision and exceptional comfort — and now, extended sub bass — for a deeply moving experience. The extremely precise yet non-fatiguing sound of the HD 660S2 delivers even more impact with extended sub bass. With an optimized surround, transducer airfl ow, and coil our engineers doubled the sound pressure at the lowest octaves. You can feel the lowest note on the piano (27.5 Hz) or the kick of the bass drum (45-60 Hz) as if you were there.
The HD 560S indulges the audiophile evaluating their music’s entire journey through the audio path. With linear acoustics and exceptional low-frequency performance the HD 560S was crafted for the analytical audio enthusiast. This open-back headphone is tuned to reveal every detail in your music without sacrificing the gratifying bass response. When combined with its ultralight chassis and luxurious comfort, it’s a breakthrough value in reference monitoring.
| Pros for Sennheiser - HD 660S2 Wired Over-the-Ear Headphones - Black | |||
|---|---|---|---|
| Sound Quality, Bass, Comfort, Open Back | There were no pros for this product— | There were no pros for this product— | Sound Quality, Comfort, Bass, Weight, Fit |
| Cons for Sennheiser - HD 660S2 Wired Over-the-Ear Headphones - Black | |||
| There were no cons for this product— | There were no cons for this product— | There were no cons for this product— | Cable Length, Clamping Force |
Specs
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