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Your cart is empty.From thundering timpani, to the melodic sound of a guitar, the impressive singing voice of your favorite artist, or the beat of electronic dance music, nothing creates drama like powerful bass. Ideal for music lovers, the non-fatiguing, high-end HD 660S2 now delivers even more impact and emotion. Our engineers optimized the HD 660S's surround, transducer airflow, and coil to double 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 at the recording studio, allowing you to pick out individual instruments and discover new sonic details.The relaxed sound and open-black design make it an extremely comfortable headphone that is also suitable for long listening sessions. The headphone's warm, relaxed sound is reflected in its timeless design and elegant bronze accents. With warm tuning, smooth treble and strong bass, the standard-setter for extended listening is now also the standard for extended bass.
Phil
Reviewed in Australia on March 28, 2025
Had a pair of hd650s for 15 years before getting these. To my ear they bring everything I love about the 650s plus some really great expanded bass. The mids don’t feel as prominent but are still clear as day, definitely worth that small trade off. Highly recommend especially if your old 6 series pair have died and you’re looking for a replacement.
Abdulla Abdurakhmanov
Reviewed in Sweden on February 24, 2025
The sound is quite balanced for my taste (so no screaming basses and highs, which I wouldn't like).I had before those Bower & Wilkins (yeah, I know, I just followed the hype many years ago, don't hate me for that).In comparison, even though B&W were more expensive, those are just much better. I'm not a audiophile, yet I hear the difference pretty convincing that these headphones are good.The only problem with these headphones, I think Sennheiser kind of competing with this and other models: 6xx, 650 are really good for a bit better price. Perhaps, this may not be the best value in that comparison, just don't throw away the idea of other models and you may get better deal.
steelrat
Reviewed in Germany on February 20, 2025
Ich habe einige KH probiert!unter anderem:Fiiio FT1 Pro -> Konstruktion und Stabilität fragwürdig, im Tiefbass hört man tw das flappen der Membran. Sonst Planartypisch zurückhaltendere Mitten, hohe Auflösung, aber auf Grund der Qualitätsanmutung und dem Tiefbass-Problem nicht mein FallAnanda NANO - Planartypisch zurückhaltendere Mitten, hohe Auflösung, guter Bass, etwas zischend in den Höhen. KO Kriterium - PASSFORM (keine Swivel Funktion der Muscheln)Arya Stealth - Planartypisch sehr zurückhaltendere Mitten, hohe Auflösung, guter Bass, etwas zischend in den Höhen. Um Dialoge besser zu hören ist eine Lautstärke erforderlich, die die Höhen extrem ermüdend macht. Die Bühne empfand ich als unnatürlich gross, das Imaging war dadurch für micht etwas erschwert. Vor allem beim Spielen. Daher auch der Retour.HD660S2 - gute Auflösung, gutes Imaging, gute Mitten, eher kleinere Bühne, schnell und detailliert in der Abbildung (nix gegen die Planaren, die ich vorher getestet habe. In der Beziehung waren die überlegen), einzelne Instrumente oder Audiocues lassen sich gut zuordnen. Extrem bequem, sehr leicht, gut verarbeitet, auch wenn er "nur Plastik" ist. Leicht anzutreiben! Fiio K11 reicht. Man hat nicht das Gefühl auf Grund eines zu schwachen AMP etwas zu verpassen. Alles in Allem ein guter Allrounder, extrem bequem und daher gern getragen. Was nutzt der beste Klang, wenn man sich dabei nicht wohlfühlen kann? Und hier punktet Sennheiser mit allen 3 KH, welche ich von Ihnen besitze (660S2, 620S und Momentum 4) Alle 3 sehr bequem, und werden gern getragen.
Victor
Reviewed in France on January 5, 2025
Excellent casque d'une qualité exceptionnelle à coupler avec une amplificateur. Une merveille avec un Ifi Hip DAC 3. Basses profondes, médium neutres, et aiguës précis
Laurence Naude
Reviewed in the United Kingdom on July 31, 2024
So glad I bought these, they were a treat and wondered if I should spend the money. Worth the price and value for money.The fit is very comfortable, does have not excessive clamp and light weight. I forget I have them on sometimes and even that they have a cable.Sound wise they sound pretty neutral to me, but I’m not an expert. You can hear more detail in the mix and instruments. Sound stage is not impressive but not bad either. I have a pair of Sony WH-1000XM4s and although they are fairly easy to listen to they are far to bassy the point of being harsh and sound muddy, if you have been listening to these. Better frequency-wise, and more comfortable than a pair of oldish Grado SR225s.Yes they are open, yes there are other more practical headphones with noise cancelling and wireless features, and apps etc. But these are old school, no fuss and make you appreciate the music again.. easy to understand why they are fan favourites. Always surprised when I put them on.Only gripe is that the cable catches my nose and mouth when taking them off in a hurry. Theyre a bit underpowered on my iPhone, so you’ll need a dac or amp of some sorts. Works perfectly well on my MacBook Pro without extra amplification.Decent build quality, but sadly no decent case for your money.
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