HD 660 S2

  • New

HD 660 S2

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.

Hurry up! only 1 items left in stock!
€599.00
VAT included
Last items in stock

  Authorized Dealer

By original manufacturer or local distributor

  terms of delivery

Free shipping and free returns

  return conditions

30 days money-back guarantee

  Visa, Mastercard, Google Pay, Apple Pay & PayPal

even in multiple rates!

Features

  • Unique vented magnet system for minimal distortion
  • An immersive listening experience with vivid timbre and deep, precise sub-bass
  • Outstanding quality developed in Germany and manufactured in Ireland
  • Lightweight aluminum voice coil with an impedance of 300 ohms and optimal response
  • Soft, snug ear pads and an open design ensure maximum wearing comfort


Your new headphones for the desert island

Every pair of high-end headphones 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.

Feature Description
Article number (SKU) 700240
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 4.5mT

Measurements:

What does this mean?

The black line is something that could be called the „ideal“ curve of what a headphone should sound like. The Harman Research Group has a range of scientific studies around audio and the human perception of it - one of which was, how should a headphone sound like to be favored by a majority of people, no matter the age or other demographic variables? This result is called the Harman target.

From left to right we have the sub bass, bass, mids and then the curve finally tilts upward where the treble begins - this part of the frequency spectrum gets amplified naturally by the shape of the human ear. 

Now I know that the bass rolloff, typical for open dynamic driver headphones, is still there - but compared to the HD650, it really is twice as loud. This means, if you want to  boost the bass even further with EQ, you can do so at lower risk of getting distortion from too much of it.

Midrange is excellent, even and resolving; Treble is relaxed but still airy and detailed. A very rounded presentation and very enjoyable listen. 

Harman Research:

The Perception and Measurement of Headphone Sound Quality- What Do Listeners Prefer?