SENNHEISER HD 660 S - HiRes Audiophile Open Back Headphone

These are certainly well performing headphones, but in the final analysis they are just OK. Imaging and soundstage are good, neutral to warm sound, non fatiguing, good for long listening sessions.

Wow great deep sound and detailed. Tight and great lows. Comparing them to my HiFiMAN 400i they are tighter and the sound stage is not as wide. Still they are worth every penny. The HiFiMAN 400i are less than half the price and just as good.

These sound ok but I had a pair of Audio Technica at half the price that sound better

They’re worth it.

I have never been a big fan of headphones. When I first use them for listening to music they seem to sound good at first but after about 15 or so minutes the sound seems shrill and I get a headache. Mostly I use headphones for tracking sessions in my recording studio and listen to music for pleasure over my speakers. The HD 660s arrived yesterday. My past experience with so called Audiophile headphones has found them to be only marginally better than inexpensive ones. To give them the best test platform I could I tested them with my Pono player, listening to the 24bit FLAC remaster of American Beauty by the Grateful Dead. I hit play and Box Of Rain started. WOH, dude! I was flooded. I have had the MFSL vinyl version of AB since it came out so I am used to audiophile quality pressings of this album but I have never heard it like through these headphones. The clarity and definition is truly staggering. I jumped ahead to the vocally intensive Attics Of My Life. It was so clear I could hear the singers breathing and and for the first time could recognize the voice of each singer in the harmonies. After that I listened to Portugal, The Man, Dark Side of the Moon, Pet Sounds, Revolver and Hippopotamus, the new Sparks album. Every one was amazing through these headphones. After listening to all that I realized that after several hours listening I hadnt developed the noise hangover every other set of headphones has given me for the last 50 years. I decided to give them a real test. Everyone knows that you dont mix studio tracks in headphones but I decided to give it a try. Every instrument and voice sounded clear and distinct as I mixed them into a master recording. In the past Ive gotten mixes with headphones that sounded great in the headphones but not so much anyplace else. This mix I put on a thumb drive to test in my favorite listening environment, my car. It was perfect which means that what I heard in the headphones was accurate and uncolored. I didnt think that level of accuracy was possible with headphones. I am completely impressed all around. While to some they may seem a bit pricey, they are so good that in fact they are a bargain for what you get. You may never be able to listen through other headphones ever again. Most highly recommended!

These headphones sound very nice, they are open back though so there is no noise cancelation at all, probably best to research what open back is as well if you don’t know (I didn’t know before buying these). Another note is for best sound quality I would reccomend an amp and maybe a DAC depending on your setup, I would reccomend research on that as well don’t just go with the same brand for the amp/DAC because it’s a bit overpriced for what you’d be getting. All of that said I’ve ordered an AMP and will see how they sound with that in mind

The reviews from many others have covered basically all the great points of this headphone. I will not repeat them. However, the description says Did you know? The HD 660 S is designed and engineered in Germany, then manufactured to exacting standards in Sennheiser’s Tulamore, Ireland factory, yet the packaging says Made in Romania. I have nothing against Romania, but I absolute hate false claims.

Audio is an interesting beast. Certain sounds appeal more to certain people, others might like different sound profiles. Theres really no way to pinpoint what is the best pair of headphones unless youre going into the obscenely high-end in price and quality.

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I have had these headphones for 2 year now. Ive had Bose for $100 and HD 559s for $150 that got me more excited than these. If your looking for any bass at all, stay away. Even for tracks that originally have a mild amount of bass do these just simply sound boring. They unfortunately have been one of the least enthusiastic headphones I have ever owned.