Sennheiser succeeds in creating a masterpiece with the HD 660 S. The headphones deliver true audiophile sound quality that's perfectly balanced when required. These are best enjoyed with a quality amplifier when listening at home, but holds up well for professional evaluation and editing of material...

In the audio community, the Sennheiser HD 650 is something of a legend – an excellent value headphone, it delivers exceptional audio quality without costing the earth. It is perhaps a bold move, then, for Sennheiser to release a successor to the much-loved HD 650, named the HD 660 S.

Crisp and keen treble; much more resolving than HD 650; Smooth and rich mid-range; Controlled; tight bass response; Easier to drive than HD 650; Matte black aesthetic is subjectively better looking than previous designs

Sub-bass extension is still not mind-blowing

I have had many h/phones over the years LCD 3 HD800s and so on but pound for pound nothing matches HD 650 and now the HD660s.In my opinion they are the best by far in this price range and a fair bit above. I know it is a matter of preference.

Wow, what to add to the many excellent reviews written here re the new Sennheiser Headphones Well now for me, as a baby boomer who has been spoiled with technology all his life, I must write about my personal experience with this new, brilliant enhancement to my audio life..

Were it any other maker producing the HD 660 S I would have been quite impressed with how close they managed to get to the sound of the legendary HD 600/650. But from Sennheiser themselves producing it and with plans to discontinue the HD 650 I can only shake my head in disbelief.

The Sennheiser HD 660 S are high-end open-back headphones. These are the kind you might use to listen to music at home, or to watch a movie late at night when you don't want to disturb anyone else.

Great soundstage; Comfortable; Dynamic and involving

Value enjoyment over tonal neutrality a little

High-quality, neutral headphone with clean approachable sound quality. Pairs well with a portable headphone amp, but will work fine directly from a phone. Enjoy high-end audiophile performance at affordable price.

Good detail, solid soundstage, and clean neutral sound; Ideal for jazz and orchestral music lovers

No carrying case, no shorter mini-plug cable; A little shy on the bass and midrange richness

Sound quality and comfort

none

I'm about to compare two of the best selling headphones in the $500 price range. But these two sets of cans sound vastly different. Which better suits your taste, and which one is objectively superior in overall sound performance?

pdating a much-loved product like the Sennheiser HD 650 is a tricky task. But having spent nearly 75 years in the audio business, Sennheiser understands the importance of reading the tealeaves.