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Sennheiser HD 660 S Review

Sennheiser HD 660 S

If you are looking for the best headphones for listening to music, then buy Sennheiser HD 660 S, they are excellent and ideal for neutral listening. Their quality of the bass is consistent, enjoyable, and punchy. They have a mid-range that is well-balanced and clear. Another good thing is that their treble is truly amazing as well. However, these headphones, their bass lacks a bit of thump and is a bit muddy and not consistent. They also sound a bit mid-range and forward. Another issue with them is that their treble lacks a bit of detail and might sound slightly veiled. But in overall performance, these headphones are fabulous versatile headphones. You will use them for different games, music, and movies.

Check out this awesome: Sennheiser Noise Canceling

Equalizing of Sennheiser HD 660 S

Sennheiser HD 660 S will provide a more bass along with the treble features. The driver technology that features in these headphones is quite good, and you will equalize your music without losing its definition and will not introduce any form of distortion. Its equalizer bands are as follows:

  • 31Hz + 6.3dB
  • 62Hz + 3.5dB
  • 16kHz + 7dB

ADSR / PRaT of Sennheiser HD 660 S

The levels of ADSR and PraT of these Sennheiser HD660S headphones is quite recommendable. The sound is snappy and quick. Also, the transient response is amazingly well, and you will get precise measurements online. The advantage is that you will easily learn how things are, and the transient levels will change according to the source.


Sennheiser HD660S headphones are not portable. This is due to their high demand for power. They are ideal for use on a desktop or for home use while you have a reliable source of power.

Frequency Response Consistency

These Sennheiser HD 660S type of headphones will have a good frequency response for consistency. This factor is brought by due to their open-back and earpad design. Sennheiser headphones have near-perfect consistency in delivering their bass.

Overall Noise cancellation

The Sennheiser HD 660 S have poor noise isolation due to their open-back design. In the bass range, you will hear the rumble of airplane and bus engines when you are using these headphones. They will practically achieve no noise isolation.

Technical specification

  • 4.4-mm balanced Pentaconn and 6.35-mm connectivity (3.5-mm adapter supplied)
  • Detachable cable with a 6.35-mm connector (3 m)
  • 38-mm dynamic speaker drivers (neodymium magnet)
  • Weight: 260 g
  • Over-ear design
  • 10-41.000 Hz frequency response
  • 104 dB @ 1 V/1 kHz Sound Pressure Level.
  • Removable ear pads
  • Detachable cable with a balanced Pentaconn connector (3 m)
  • Normal impedance 150 Ω
  • The transducer principle is dynamic, open.
  • Circumaural ear coupling
  • Matte black
  • Headband wearing style
  • Storage box included
  • Low harmonic distortion

Sennheiser HD 660

Quality features of Sennheiser HD 660 S

  • Quality audiophile

These headphones sophisticated audiophile sound quality that will let you use these headphones in many situations. They have improved performance as compared to their predecessor models. They have a lower impedance level and a transducer design. Their lower impedance will help deliver some reference-class sound that will allow you to have the best while connected to hi-res mobile players.

  • Best sound quality for the passionate music enthusiast

As a listener, you will experience the best and quality sound, thanks to the crisp bass, excellent mid-frequency response, and their pleasant natural treble.

  • Excellent connectivity

Sennheiser HD 660 S will provide a wide range of connectivity options and from different audio sources. These headphones offer a lower impedance level. The headphones have a big capacity when you connect it to some balanced outputs such as HDV 820. Its cables feature highly conductive OFC copper that supports low handling noise and sturdy para-aramid reinforcements.

  • Superior comfort

Sennheiser HD 660 S will come with elliptical ear cups that have the ear design. Also, their thick padding on the headband will offer you more and superior comfort while listening to your favorite music and watching movies. The headband ear cushions are replaceable. The headphones are also lightweight and have an open construction.

  • State of the art Sennheiser technology

These headphones feature the latest and sophisticated transducer design that is developed by Sennheiser. The technology will help you have better and improved control of the diaphragm movements of these headphones. The fabrics making these headphones are stainless steel that is well contoured on the diaphragm. Another feature that makes these headsets ideal is their extremely light aluminum coils that will offer the highest impulse fidelity. Its transducers are wisely selected and paired to ensure narrow tolerances of (1dB). You will listen to music while you are in indoor environments due to their open design.

  • Nominal impedance with a nominal impedance of 150 Ohms, this is ideal for some direct connection for both stationary and hi-res mobile players.

Sennheiser HD 660 S box components

  • ¼” to 1/8’’ Adapter
  • Storage box
  • Cable of 4.4’’ pentagon plug
  • Cable with 1/4” plug.
  • Two-year limited warranty.
  • User manual
  • Sennheiser HD 660 S Wired Over-the-Ear Headphones


  • Excellent sound quality
  • Replaceable earpads and cables
  • Sturdy construction
  • Thick and long supplied cables
  • Ideal for jazz and orchestral music lovers

Cons of Sennheiser HD 660 S

  • High out-of-the-box clamping force
  • Need a good DAC/amplifier to be fully utilized
  • No carrying case
  • A little shy on the bass

Sennheiser HD660S is ideal for those people who love watching movies and for the lovers of music. These headphones will come with benefits and advantages as compared to the conventional headphone’s models in the market today. First, their sound quality is superior, thanks to the HD 700 sound drivers. Comfort is always guaranteed when you use these headphones. The materials making the earcups are super soft, and this will ensure that you will listen to music for long hours without any form of discomfort. The packaging is also good since it will come with everything one will need. You will also connect your headphones to a variety of audio sources, thanks to the type of audio jacks. Why don’t you buy them today for more benefits?

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