(Open Box) Sennheiser HD660S2 Open Back Headphones
(Open Box) Sennheiser - HD660S2 Dynamic Open Back Headphones
Audiophile Open-Back Headphones
Sennheiser - HD 660S2
(Open Box)
Please note: This is an open box product, packaging has been opened and demonstrated to a customer, but product is in as-new condition.
'Dive deeper into legendary sound.'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.
104dB(1 V)Sound Pressure Level
8 – 41,500 HzFrequency Response
300 ΩImpedance
At a glance
• Uniquely powerful vented magnet system for minimized distortion
• Ultra-light aluminum voice coil with 300-ohm impedance for excellent impulse response
• Intimate sound with great timbre and deep, accurate sub bass
• Plush ear cushions and open design for maximum comfort
• Outstanding quality designed in Germany, made in Ireland
What's included
• HD 660S2 headphones
• 6.3 mm cable (1.8 m), 4.4 mm cable (1.8 m)
• 6.3mm to 3.5mm adapter
• Carry pouch
Your New Desert Island Headphone
stunning resolutionEver 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
extraordinary precision and balanceTraditionally, 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.
'Some Things Just Feel Awesome To Wear'
They feel as great as they soundThe 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.
How do you one-up a line of legends?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.
The Tech Spec
| Features | Specification | Transducer principle | dynamic, open |
|---|---|
| Transducer size | 38 mm |
| Frequency response | 8 – 41,500 Hz |
| Impedance | 300 Ω |
| Sound pressure level (SPL) | 104 dB (1 kHz, 1 Vrms) |
| Total harmonic distortion (THD) | <0.04% (1 kHz, 100 dB) |
| Ear coupling | Over-Ear |
| Weight | 260g |
| Adapter | 6.3 mm (1⁄4 inch) to 3.5 mm |
| Connector | 6.3 mm (1⁄4 inch) jack plug, 4.4 mm balanced plug |
| Cable length | 1.8m |
| Country of origin | Ireland |
| Magnetic field | 2.5mT |
