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SENNHEISER HD 660 S - HiRes Audiophile Open Back Headphone
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|Connectivity Technology||Wired 6.35 mm / 4.4 mm Pentaconn|
|Model Name||HD 660 S|
|Form Factor||Over Ear|
About this item
- Make sure this fits by entering your model number.
- Reference class open back, dynamic headphone employing new and improved transducers delivering low harmonic distortion
- Transducers are hand selected for precise (1 dB) left / right matching tolerance insure exceptional accuracy and presentation of stereo spatial characteristics
- 150 ohm nominal impedance allows direct connection to home and mobile Hires audio devices. Contact pressure: 6.0 N - 1 N
- Para aramid reinforced, detachable cables employ high conductive OFC copper to insure signal integrity with very low handling noise
- Supplied with two connection cables: One with a 6.35 millimeter stereo plug, the other a 4.4 millimeter Pentaconn balanced stereo plug. Also included is a 6.35 millimeter to 3.5 millimeter adaptor. Connectivity Technology: Wired 6.35 millimeter / 4.4 millimeter Pentaconn
- Frequency response 10 to 41,000 Hz ( 10 dB), Impedance 150 ohm
- Note: Kindly refer to the user manual provided as a PDF manual in the product description section
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From the manufacturer
Sennheiser is shaping the Future of Audio – a vision built on a 75-year history of innovation and a continued drive for excellence that is woven into our company’s DNA and culture. Around the world, our employees share this passion in the pursuit of the perfect sound, creating products that exceed expectations and set new benchmarks in audio.
Meet the Sennheiser HD 660 S
The new HD 660 S is the successor to the legendary HD 650. This open-back, dynamic headphone features new lower (150-ohm) impedance transducers producing reference-class sound when connected to both Hi-Res home or mobile audio systems. An elegantly designed piece of German engineering, the HD 660 S delivers exceptionally accurate and transparent sound, with an expressiveness that immerses the listener in every emotion and nuance of the music.
- Did you know? The HD 660 S is designed and engineered in Germany, then manufactured to exacting standards in Sennheiser’s Tulamore, Ireland factory.
- Every HD 660 S undergoes rigorous, multi-parameter testing to insure performance essential to the most demanding listeners.
Crafted for the demanding listener, the HD 660 S surpasses the performance of its predecessor, the legendary HD 650. Detailed and dynamic, with extended and balanced frequency response, the HD 660 S is exceptionally accurate and musically expressive. The lower 150-ohm impedance facilitates direct connection to both premium home and mobile audio devices.
The HD 660 S employs newly designed transducers featuring extremely lightweight aluminum voice coils coupled to diaphragms precision-crafted from stainless steel fabric. This combination results in exceptional transient response and improved control of diaphragm movement reducing distortion. Additionally, transducers are produced and matched to extremely tight (± 1 dB) tolerance ensuring superb performance.
The HD 660 S is supplied with two para-aramid reinforced detachable cables employing high conductivity OFC copper to ensure signal integrity with very low handling noise. One cable is terminated with a 6.35mm stereo plug (a 3.5mm adaptor is also included), the other with the new 4.4 mm Pentaconn balanced stereo plug. Balanced connectivity can reveal full HD 660 S performance potential when paired with the balanced output of a digital audio player or headphone amplifier like the Sennheiser HDV 820.
The HD 660 S is designed for pure listening pleasure. Its open-back architecture is strong yet lightweight and allows airflow to the ears, keeping them cool during listening sessions. The large elliptical ear cups are shaped following the anatomy of the ear, and feature soft velour covered ear cushions. Thick headband padding completes the comfort package to provide hours and hours of supreme listening pleasure.
|HD 660 S||HD 650||HD 600||HD 700|
|Ear Coupling||Over-ear (circumaural)||Over-ear (circumaural)||Over-ear (circumaural)||Over-ear (circumaural)|
|Transducer Principle||Dynamic, Open||Dynamic, Open||Dynamic, Open||Dynamic, Open|
|Frequency Response||10 – 41,000 Hz (-10 dB), Diffuse-field equalized||10 – 41,000 Hz||12 – 40,500 Hz||8 – 44,000 Hz (-10 dB), Diffuse-field equalized|
|Sound Pressure Level (SPL)||104 dB (1 kHz / 1 Vrms)||103 dB (1 kHz / 1 Vrms)||93 dB (1 kHz / 1 Vrms)||105 dB (1 kHz / 1 Vrms)|
|Impedance||150 Ω||300 Ω||300 Ω||150 Ω|
|Total Harmonic Distortion and Noise (THD + N)||<0.04% (1 kHz, 100 dB)||<0.05% (1 kHz, 100 dB)||<0.01% (1 kHz, 100 dB)||<0.03% (1 kHz, 100 dB)|
|Connector||6.35 mm / 4.4 mm Pentaconn||6.35 mm||3.5 / 6.3 mm Stereo||¼” (6.3 mm) Stereo|
|Weight w/o Cable||9.17 oz. (260 g)||9.17 oz. (260 g)||9.17 oz. (260 g)||9.52 oz. (270 g)|
|In the Box||HD 660 S / Cable with 6.35 mm Plug / Cable with 4.4 mm Pentaconn Plug (balanced) / Adapter 6.35 to 3.5 mm / Manual / Storage Box||HD 650 / Cable with 6.35 mm Plug / Adapter 6.35 to 3.5 mm / Manual / Storage Box||HD 600 / Cable with 6.35 mm Plug / Adapter 6.35 to 3.5 mm / Manual / Storage Box||HD 700 / Cable with 6.35 mm Plug / Manual / Storage Box|
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|Shipping||FREE Shipping. Details||FREE Shipping. Details||FREE Shipping. Details||FREE Shipping. Details||FREE Shipping. Details||FREE Shipping. Details|
|Sold By||OceansideSales||Amazon.com||Amazon.com||Bsd Wholesale||Liquid Audio Inc||Electronics Expo|
|Headphones Form Factor||Over Ear||Over Ear||Over Ear||On Ear||Over Ear||Over Ear|
|Item Dimensions||10.12 x 4.25 x 12.6 inches||6.06 x 3.07 x 5.67 inches||7.2 x 6.1 x 3.2 inches||6.69 x 4.33 x 7.48 inches||10 x 4.33 x 12.4 inches||8.1 x 3.95 x 10.25 inches|
|Item Weight||0.58 lbs||0.53 lbs||0.57 lbs||0.66 lbs||0.57 lbs||0.55 lbs|
Sennheiser's new HD 660 S is an open back, dynamic headphone designed for the passionate audiophile. Meticulously crafted for the most demanding listeners, the HD 660 S builds on the legacy of the legendary HD 650, surpassing the exceptional performance of its predecessor incorporating a new and improved transducer that delivers lower harmonic distortion producing a more natural, lifelike audio experience. It is exceptionally accurate and transparent, with an expressiveness that immerses the listener in every emotion and nuance of the music. Employing a lower 150 ohm impedance, and supplied with cables using balanced (4.4 mm Pentaconn) and 6.35 mm connectors, the HD 660 S offers connectivity versatility to provide reference class fidelity with stationary and mobile audio players alike.
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Top reviews from the United States
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The HD 660 S is incredible. No frequencies pop out like the Beyerdynamics (too harsh in the high end), everything is very even. Excellent in the mid-range for sure, unlike many headphones that try to push the higher frequencies to come across as "super pro." It's natural for our brains to go "ooh" when we hear bass, or crisp highs, but you don't want these things when judging a mix!
Bass is quite good (but not ear-rumbling), about as good as my Shure SRH1540's. If you want a good pair to judge bass and sub-bass, definitely grab the Audio-Technica ATH-M50x in addition to the HD 660 S, and prepare to be amazed—I've never heard such good subs in a pro level headphone. Don't get the ATH-M50x as your sole pair of headphones, they're problematic in the mids and mid-highs.
Some things to keep in mind with the HD 660 S:
- These are pro level open-back headphones meant for studio use, so you must be in a quiet environment to use them properly. Also, don't wear them in public because external noise will ruin it for you, and you'll annoy people around you because they'll be able to hear everything.
- Headphones sound a little better after a brief burn-in period (48-72 hrs). Plug them in, put them on your ears, and fire up some heavy rock or electronica at a volume that's loud, but not painful. Then remove the headphones and let them sit for a few days. This loosens up the material around the drivers. Some people think this is a myth, but some of the best mix engineers in Hollywood disagree.
In short: get these headphones, they're incredible!
Very comfy, tho slightly tight.
Sennheiser has created another (HD-Family) classic.
You'll keep this one.
Tested all 3 with JDS Labs Atom Amp, Scarlett 2i2 1st Gen, & Tidal.
The Sundara was insanely good all around and felt like it was made for my ears, both fit and sound. Bass was awesome thanks to planar tech. Unfortunately had QC issues with around 10% lower volume on one side. Returned it and swore off HiFiMAN because of a poor support experience.
The DT1990 Pro had incredible clarity and sound stage. The analytical pads felt and sounded better. Still, way too bright for my ears and felt fatiguing. Also had a minor QC issue with the pads being a different thicknesses and a very slight tone difference between left/right ear being maybe 3% more dull on one side if I were to estimate. Beyerdynamic support was great but the pads, tone issue and brightness led me to return it.
The HD 660 S was the keeper. Volume and tone are even on both sides. Great for listening, but definitely less analytical. Strong imaging, but very weak sound stage compared to the other two. Bass roll off is there, but still sounds great.
Basically, If I could have the Sundara's overall sound/bass, DT1990 Pro's alanytics/soundstage, and HD 660 S's reliability/imaging it would be a perfect world.
This journey made me realize why people have headphone collections...
I ordered the HD660 headphones since the reviews indicated they are clearer without the "Sennheiser veil". I did find a review online that said they were not smooth and the reviewer was right according to my hearing! I wasn't expecting how strident the HD-660 was. Voices in the mid to high have a grating artifacts that do not sound natural. The same when playing on my digital piano in the mid keys. My piano was unplayable with them.
I returned the HD 660 S and exchanged for the HD-600, which are much smoother. They work great with my piano. I was surprised how much difference there is in the two headphones.
Of course picking a headphone is subjective. Everyone's hearing is going to be different.
Top reviews from other countries
Primero lo importante, el sonido:
En cuanto a balance general, es decir, tonalidad, y equilibrio de la respuesta en frecuencia (para mis oídos) tenemos un sonido ligeramente cálido, con un ligero énfasis en los bajos medios y bajos altos (entre 80-150 Hz) aproximadamente. Existe una ligera falta de impacto y poder en los bajos (debajo de 60 Hz, diría yo). Y no por eso pierde musicalidad, en general el timbre es muy acertado, y la resolución general es comparable a la de los DT1990.
¿Cuáles son los puntos débiles del sonido? Bien, en mi opinión la espacialidad es pobre; difícilmente se puede percibir el sonido más allá de tus orejas (a diferencia de los DT770, DT1990, T50RP e inclusive los HD598, o los SHP9500, entre otros). Esto aunado a que si ya posees los HD598, es difícil percibir una diferencia en el balance tonal entre estos dos pares. Claro, los HD660 tienen una resolución superior, mayor comodidad y mejor construcción, por supuesto. Pero yo sugeriría escuchar ambos pares lado a lado y decidir si vale la pena el salto.
¿Existen motivos para no recomendarlos?
Tienen una construcción robusta, y parecen duraderos, allí no veo el problema. Son cómodos y no te acaloran demasiado las orejas. El cable que viene con éstos puede ser demasiado largo para muchos, yo conseguí uno de 1.2 m en el sitio estadounidense de Amazon. No he escuchado algún otro modelo de la línea HD6--, así que les debo una comparación, pero tienen fama de poseer un balance tonal muy parecido. Así que considerando ésto sí los recomiendo, señalando que de preferencia deberías escucharlos antes de decidir.
No poseo un amplificador balanceado así que sólo los probé con la salida estándar. Por si alguien tiene curiosidad con mi DAC Topping D10 y amplificador Liquid Spark; y también con mi teléfono, que le provee suficiente energía para llegar incluso a niveles ruidosos. Estos audífonos no NECESITAN un amplificador dedicado, pero adquirir uno no viene mal.
Espero sea de utilidad mi reseña, gracias por leer; actualizaré en caso de algún percance o por información adicional que considere útil añadir (imágenes, por ejemplo).
Sound wise These are not a combination of the best attributes of other 600 series headphones but have an independent sound of their own. They take a long time to loosen up sonically but when they do the lower registers are solid and defined - convincing without sounding forced. Don't get me wrong - if you love tub thumping bass these cans are not for you. If on the other hand if you are looking for realism and detail, texture where you can close your eyes visualize where each drum is in the set then these will put a smile on your face. The same is true for the high frequencies. It's quality over quantity here, but such finesse for what is a sub £500 headphone. The mid frequency 'vocal' range is where all the 600 series shine but with the 660S this isn't too forward a presentation.
For open headphones the soundstage isn't that wide but then again not as confined as some might suggest. Imaging and placement is very well defined even by Sennheiser standards. Basically these headphones excel in more areas and with fewer compromises that any of the previous models in the range. They are reasonably sensitive and don't present too dificult a load so go plenty loud enough from just about any source. That said you can really reap the benefits of a dedicated headphone amp with the HD660S, and they reward your investment in that department. I've marked them down for comfort as they've yet to loosen up the clamping force against my ears - which for me is a little tight. And at €450 its impossible to give them 5 stars for value - not when the much cheaper new HD560S can be had for 1/3rd of the price - now they are a real bargain!
These are open-back headphones - wide, open sound stage but my wife can hear my music from the other room when I crank it :-) Not suitable for office or outside. Surprisingly powerful bass though.
The sound signature is clear, neutral and effortlessly dynamic. I was surprised how many highs I didn't know existed in songs I listen to. I did buy an amplifier (FiiO A5), even though a phone drives these reasonably well.
Took me a few days to get used to the new sound signature but it's been awesome. They play well with classical music, rock, metal and rap. Haven't tried much Jazz yet. Great for extended listening without getting fatigued, critical listening and simply enjoying high-quality productions. I've perused many reviews and, in hindsight, disagree with innerfidelity's perceived "graininess" - I haven't noticed an effect like that.
A word of caution: these headphones will reveal the quality of poorly produced records (cue loudness war / Red Hot Chili Peppers/Metallica etc).
I'll enjoy these for many years to come and am glad I did spend the money.