Sennheiser HD 660 S

Good for neutral listening. Their bass is very good, consistent, and punchy, the mid-range is well-balanced and clear, and their treble is very good as well. However, their bass lacks a bit of thump and is a bit muddy; they also sound a bit mid-rangy and forward. Also, their treble lacks a bit of detail and might sound slightly veiled. Overall, they are great versatile headphones for a wide variety of music genres but their sub-bass might be lacking a bit for bass-heavy music.

-- As reviewed by Rtings
Sennheiser HD 660 S 1

Product details

  • 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

PROS

+ Good audio reproduction.
+ Comfortable fit.
+ Well-built design.

CONS

- High leakage and low isolation, by design.
- Can be tight on some heads.

Expert reviews and ratings

By Rtings on May 08, 2019
Good for neutral listening. Their bass is very good, consistent, and punchy, the mid-range is well-balanced and clear, and their treble is very good as well. However, their bass lacks a bit of thump and is a bit muddy; they also sound a bit mid-rangy and forward. Also, their treble lacks a bit of detail and might sound slightly veiled. Overall, they are great versatile headphones for a wide variety of music genres but their sub-bass might be lacking a bit for bass-heavy music.
79
By TrustedReviews on December 19, 2017
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.
90