Sennheiser Black HD 660S2 Hi-Res Over-Ear Headphones - 700240
which ends 07/05/2026
Sennheiser HD 660S2 Hi-Res Over-Ear Headphones
Listen like a pro with the Sennheiser HD 660S2 headphones. These high-res headphones produce intimate, relaxed sound for enjoyable listening, with a design that prioritizes comfort for long listening sessions. With natural, warm sound, your favorite albums, audiobooks and podcasts sound more lifelike in your ear. The Sennheiser HD 660S2 also features a new extended sub bass for deep, accurate bass you can feel, adding new depth to every song; double the sub bass means everything from bass-heavy genres to extreme low notes in classical music sound more detailed. These over-ear headphones are designed to produce sound that feels more intimate, allowing you to connect with your favorite songs for more meaningful listening.
A Tradition of Natural Sound
The latest in a series of high-end Sennheiser headphones, the Sennheiser HD 660S2 continues a tradition of enjoyable, neutral sound. A new aluminum coil offers higher impedance, resulting in superior impulse response and pro-level listening. Its vented magnet system minimizes distortion, further adding to that realistic playback. Improved precision lets you hear more detail, from each individual instrument to clearer vocals. The enhanced soundstage will make you want to listen longer.
Headphones That Feel as Great as They Sound
The Sennheiser HD 660S2 headphones offer superior comfort with plush ear cushions that let you listen longer. Their open-back design not only helps contribute to the realistic sound experience; it also allows for improved air flow to keep your ears cool and comfortable. They also come with a carrying pouch, so you can safely bring them on your work commute or cross-country flights. If you have questions about these Sennheiser headphones, get help from Abt's audio specialists at 800-860-3577. Our headphones buying guide is another resource to help you choose the right headphones for your listening preferences.
Key Features
- Uniquely powerful vented magnet system for minimized distortion
- Intimate sound with great timbre and deep, accurate sub bass
- Outstanding quality designed in Germany, made in Ireland
- Ultra-light aluminum voice coil with 300-ohm impedance for excellent impulse response
- Plush ear cushions and open design for maximum comfort
Features
Your new desert island headphone
- Every high-end headphone has its own unique personality. What if you could only own one?
Ever felt goosebumps from sound so real, it was as if the source was in the room with you? The non-fatiguing HD 660S2 gives people who love music an intimate way to connect more deeply with their favorite songs and artists. Breathtaking resolution and precision take you closer than ever to instruments and vocalists. Yet the sound is natural and balanced, never harsh or brash.
This warm, inviting signature combined with extended sub bass makes listening uniquely pleasant and rewarding. And with comfort this good, it practically begs you to keep going for endless sessions. That’s how HD 660S2 combines the best of many worlds to give you an intimate experience you won’t want to live without.
Sub bass expands the entire sound
- Double the sub bass heightens your listening experience.
Traditionally, audiophiles don’t get too excited about sub bass. It can easily get sloppy or boomy and become a distraction. And that’s a shame — because there’s so much more to experience here than just the gut punch of a kick drum. Did you know the low B of a 5-string bass vibrates at 30.9 Hz? Or that the lowest note on a concert piano comes in at 27.5 Hz? And of course, extended sub bass makes bass-heavy genres sound fantastic, too.
And that’s the magic trick here. In doubling the sound pressure at the very lowest frequencies, we’ve nevertheless retained extraordinary precision and balance throughout the sub bass, mid-bass, and beyond. Most impressive is how this affects the listening experience. Extension on the low end changes everything — by creating more space for the sound. Against a deeper backdrop, highs feel more brilliant, the soundstage deeper, emotions stronger.
They feel as great as they sound
- Comfy slippers, your favorite jeans, the HD 660S2. Some things just feel awesome to wear.
The velour earpads of the HD 660S2 can only be described as a tactile pleasure. With just the right amount of tension for proper acoustic positioning and supple padding, the headband won’t draw attention away from your music, either. As an open-back design, the HD 660S2 gives your ears an extremely comfortable climate, even for super-long sessions.
The low total weight and ergonomic headband rule out any potential discomfort on top of your head as well. Combined with excellent build quality made in Ireland, you’ll quickly grow attached to a listening experience that’s as physically pleasing as the warm, non-fatiguing sound at its heart.
How do you one-up a line of legends?
- Some of the most neutral headphones in the world are a tough act to follow.
As far back as the HD 580, high-end Sennheiser headphones have inspired generations with their balanced, natural reproduction. Recognized as benchmarks for neutral audiophile sound, the HD 600, HD 650, and HD 660S all share visible and audible DNA with the HD 660S2. The revised coil of the S2, for instance, now matches the 300-ohm impedance of the legendary HD 600 & HD 650. This new coil also provides higher magnetic force and electrical dampening for cleaner impulse response.
The surround is now more compliant, too, dropping the resonant frequency to 70 Hz. Considerable effort also went into optimizing the airflow around the transducer. There’s more sensitivity over the entire frequency spectrum because the magnet´s air gap works more efficiently now. Taken together, these measures result in even greater precision, speed, and resolution — with double the sound pressure at the lowest frequencies.
General
Warranty Information
Approximate Weight
Approximate Dimensions
Frequently Asked Questions
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Yes, these over-ear headphones feature plush velour earpads and a padded, ergonomic headband designed to provide maximum comfort during extended use. The open-back design allows for better airflow, keeping your ears comfortable and preventing heat buildup over long listening periods.
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These headphones provide a natural, warm sound with an extended sub-bass response, delivering detailed and balanced audio. They offer breathtaking resolution and precision, allowing you to hear instruments and vocals clearly without harshness, making them ideal for audiophiles seeking an intimate and immersive listening experience.
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These headphones use wired connections and come with a 6.3 mm cable, a 4.4 mm cable, and a 6.3 mm to 3.5 mm adapter included in the box. They do not support Bluetooth, NFC, or wireless connections, ensuring high-fidelity audio transmission via wired setups.
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The headphones have a 300-ohm impedance, meaning they require an appropriate amplifier or audio source capable of driving headphones with higher impedance. This results in cleaner audio reproduction and greater detail but may not be as loud when used with low-power devices like smartphones without amplification.
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No, these headphones are open-back and do not include noise cancelling or noise isolation features. The design focuses on providing a natural soundstage and minimal audio distortion rather than blocking out external noise.