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Sennheiser

Sennheiser HD 660 S - Hires Audiophile Open Back Headphone

  • Based on 1,978 reviews
Condition: Used - Very Good
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Features

  • 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

Description

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 conductivity OFC copper to insure signal integrity with very low handling noise 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 Supplied with two connection cables: One with a 6.35 millimeter stereo plug, the other a 4.4 mm Pentaconn balanced stereo plug. Also included is a 6.35 mm to 3.5 millimeter adaptor Wired 6.35 millimeter / 4.4 millimeter Pentaconn

Brand: Sennheiser


Color: Black


Ear Placement: Over Ear


Form Factor: Over-ear (circumaural)


Impedance: 150 Ohm


Noise Control: None


Frequency Response: 28000 Hz


Headphones Jack: 3.5 mm Jack


Connectivity Technology: Wired


Wireless Communication Technology: Wired


Included Components: Cable, Manual, Pentaccon Plug


Age Range (Description): Adult


Material: Aluminum, Plastic, Metal


Specific Uses For Product: Music,Gaming


Recommended Uses For Product: Music


Compatible Devices: Cellphones


Theme: Audiophile Headphones


Control Type: diaphragm movement


Cable Feature: Tangle Free


Item Weight: 0.58 Pounds


Water Resistance Level: Not Water Resistant


Frequency Range: 9 Hz - 41,500 Hz


Package Type: Standard Packaging


Unit Count: 1.0 Count


Style: Contemporary


Control Method: Touch


Number of Items: 1


Cable Length: 3 Meters


Audio Driver Type: Dynamic Driver


Earpiece Shape: Rounded, over-ear design


Is Autographed: No


Series Number: 660


UPC: 615104314030 615104340503


Global Trade Identification Number: 30, 03


Manufacturer: Sennheiser


Item Weight: 9.3 ounces


Item model number: HD 660 S


Is Discontinued By Manufacturer: No


Date First Available: October 25, 2017


Frequently asked questions

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Top Amazon Reviews

    • Sennheiser being Sennheiser
When you're looking for top of the line sound from open-back headphones, these are it. They're everything I hoped for. The sound is incredible and well-balanced, with just the right amount of warmth. Music, podcasts, or even gaming, these headphones deliver clarity. The build quality is solid and lightweight, which makes them comfortable to wear for hours. These are definitely best used in a quiet environment due to their open-back design. If you're looking for a wide soundstage, I wouldn't recommend these, but they deliver a sound above most closed back headphones. If you’re serious about audio and ready to invest in a premium experience, the HD660S is worth every penny. I would recommend them to anyone looking to take their listening several notches higher. ... show more
Reviewed in the United States on November 24, 2024 by Alexander Reyes
    • HD 660 S review - Magical legendary-ness - S Tier goodness
Let me start this off correctly. These are the best and closest to perfect headphones you will be able to find overall. The 660 S is pure magic for your ears. It’s worth the price. 💯 We can’t really talk about the 660 S without talking about the 650. I had the HD 650 back from 2013 to 2016 until I finally sold them. The HD 650 are top notch headphones, but I switched over to the X2s at the time. I don’t regret the choice. The HD 650s need a lot of power and the X2s at the time had very little competition in the $300 segment. They had more soundstage and bass. The HD 650s, which the HD 660 S is attempting to dethrone here, is an absolute monster of a headphone. The 650s offer a fatigueless experience and have basically no major flaws. True for it's time. Then I got the 660 S! The 660 S is the better headphone. It’s easier to drive first of all. Many of you may not even know what Ohms and sensitivity are. Let's say the 660 S is in many cases 30-40% louder on the same equipment. The 660 S can do everything the 650 and 600 do much better. Don’t let anyone trick you on this. It’s better – in every way. Through some sort of magical engineering, the 660 S takes the 650s top end veil off, without bringing up the highs. In fact, the highs are even further recessed on the 660 S. Don’t let this pull you back. All the details are there. Unless you’re a huge fan of V shaped headphones, you won’t find something better under $500 than this. That’s just how it is. You have to accept it. This is S tier all over the place. Let’s talk further about sound. I’m going to be brief. The 660 S are the smoothest headphones I’ve ever heard. Highs, bass, and mids are absolutely and completely balanced. Bass is punchy, accurate, and present. Mids are, of course, the highlight of the 600 series and here you are getting the best mids nearly of any headphone unless you step up humongous amounts of $. The soundstage is fantastic. It’s not too wide or too narrow. It’s just right. Where these really shine is the treble for me. These present fatigueless, milky smooth, crystal clear, purely magical, ear soothing, and perfectly accurate highs. These are a 9.5/10 headphone and S tier. You can’t beat these even if you pay $500. If you can get them for less than $500 then you are getting the best deal of your life in headphones. They are significantly better than the 650. We aren’t talking a little here. There’s a huge jump of at least 30% in clarity and imaging. Huge. I bought these and the Fiio K5 Pro. I’ve never heard sound so good in my life and I used the Creative Z with the HD 650s for years. As soon as I put these on and listened even for a little bit, I was floored by what I was getting. I said the highs were the best part right? The IMAGING!! What the heck? Let me tell you I listen to music from video game OSTs more than really anything. Wow. Incredible. This will show you details in something as old as SNES music that you never even knew existed. The imaging on these has to be some of the best in the entire world. Sounds pop up all around you and it doesn’t just sound like two speakers hitting your ears. Phenomenal imaging. They sound so clear. If you’re on the fence like I was, just get these. Do it! They’re glorious. They’re glorious with any DAC assuming they have enough power. Yes, my K5 Pro sounds way better than my other DACs, but stepping down into a lower DAC is not a disappointment at all. They’re still top tier and the best. Yea, I don’t care about all the Sundara & DT 1990 hype. Those two don’t image like these do. If you absolutely must have the bass, then these may disappoint, but if you aren’t a bass head, then these are a no-brainer. I’ll also help you here. If you really can’t justify the pricetag of these, then get the Philips SHP 9500 with the K5 Pro or E10K-TC. This combo will probably be a little cheaper, but it will sound pretty good & similar. The 9500 with the K5 Pro is quite exceptional. You won’t have the milky smooth highs though. But, if you *only* are in need of headphones, then get the 660 S. Do whatever you have to do to get your hands on them. Here's another tidbit. You can repair the HD 660 S easily with spare HD 650, 600, or 660 S parts. Everything can basically be tool-lessly repaired in the 600 line. It’s extremely supported with cables galore everywhere. The issue with the Sundaras and the 1990s is that they’re not going to have the level of support that the 660 S has. There’s a reason that the 600 series have been going strong since 1997. The 660 S is the gold standard now and every headphone should be attempting to live up to their magic. Yes, they’re legendary. Yes, the legend continues. ... show more
Reviewed in the United States on March 6, 2022 by Chase86
    • World-Class Audio Reproduction
First, let me start out by saying I'm a professional audio engineer with a focus on Jazz, Classical, Pop, and Americana genres. I own/use the following headphones currently: AKG K701, Audeze Sine, Audio Technica ATH-M50x, Beyerdynamic DT 1350-80, Beyerdynamic DT 880 Pro (250 Ohm), SONY MDR-V6, and a few more lower-end consumer grade headphones. Second, let me share something important in the HD 660S owner manual that some might miss: "These open dynamic headphones have been designed for home use with high-quality audio systems". Such system components display the "Hi-Res Audio Certificate" on their packaging and are thus meant to reproduce high quality audio recordings made to the "Hi-Res" standard. Numerous blind studies confirm trained listeners agree that what makes a headphone sound "good" is neutral, natural, balanced sound that replicates the audio quality of good speakers playing well recorded music in a good home acoustic environment. The HD 660S has been so designed; but if you want to hear how great the HD 660S sounds, you need to play music that already sounds great. So for those having no particular interest in superior high fidelity audio reproduction, then money spent on the HD 660S will be wasted. The HD 660S while somewhat forgiving, will make very obvious every flaw in music that has not been well recorded; and the lower quality of lossy audio formats such as MP3 will not allow the HD 660S to shine. The Audio Technica ATH-M50x, the SONY MDR-V6 or MDR-7506, or other cans of comparable quality, will get you a much better bang for your buck. For the rest, in my estimation, the HD 660S design goal has been well achieved, such that my HD 660S reproduces closely the dynamics, fidelity, sound stage and imaging of my studio reference speaker system. The HD 660S is a very musical headphone and worth considering for its intended purpose: enjoying Hi-Res music to the point one can get completely immersed in the experience. I would not use the HD 660S for tracking, mixing, or mastering. However, it *is* my go-to headphone for enjoying the results while relaxing in my easy chair at home. One more comment in that regard: Some reviewers are disappointed with the "width of the sound stage", accustomed as they are to the exaggerated sound stage width of most open-ended headphones. The HD 660S replicates the sound stage of my stereo masters *as they sound over my studio reference speaker system*. Sennheiser has in fact achieved with the HD 660S *not* the unnaturally wide stereo spread of most open headphones, but instead the "neutral, natural, balanced sound of good speakers in a good room". That, IMO, is a great accomplishment, and one of the main reasons I'm a big fan of the HD 660S. Writing this review in the Fall of 2022, I've not experienced any of the very few negatives some have mentioned in prior reviews of the HD 660S, and would purchase this headphone again in a New York minute. BTW, ignore the audiofools: there's no such thing as headphone "burn-in". Enjoy these right out of the box by giving your psycho-acoustic system (i.e. your ear/brain interaction) the opportunity to adjust as soon as possible to the audio signature of these very fine headphones. ... show more
Reviewed in the United States on October 16, 2022 by CriticalThinker

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