Sennheiser HD 660 S HiRes Audiophile Headphones Review

Sennheiser HD 660 S Review

Those serious about their music, known as “audiophiles,” understand the importance of high-quality audio. Here’s where a pair of premium headphones, like the Sennheiser HD 660 S, really shine. The sound quality of these headphones was created with an emphasis on detail and clarity. In this article, we’ll thoroughly evaluate these headphones’ appearance, construction, sound, features, and extras.


  • Excellent sound quality in practically every possible way
  • Replaceable ear pads and cables
  • Sturdy construction
  • Thick and long supplied cables
  • Ideal for jazz and orchestral music lovers


  • High out-of-the-box clamping force
  • Need a good DAC/amplifier to be fully utilized
  • No carrying case
  • Bass is not so loud

Design and Build Quality

With their sophisticated look, the Sennheiser HD 660 S headphones will surely win over many listeners. The headphones’ quality construction guarantees they’ll last a long time without breaking. The ear cups and the headband contain high-quality plastic, but the headband is reinforced with stainless steel.

The earcups are roomy and soft, with a padded outer layer that encloses the ears and does a decent job of blocking outside sounds. The headphones’ swiveling ear cups also allow for a wide range of customization for a comfortable fit. It’s nice that the ear cups can be removed in case of breakage or wear and replaced quickly and easily.

The headband has plenty of padding, so it’s easy to wear for extended periods. Also, the stainless steel material used in the headphones’ construction makes them long-lasting and reliable.

These headphones generally have a high-quality design and construction. So, these cans are sturdy, soft, and long-lasting.

Sound Quality

The Sennheiser HD 660 S headphones have excellent sound quality. Audiophiles looking for the highest possible sound quality will like these headphones. Also, Sennheiser’s patented transducer technology is included in the headphones, allowing for exceptionally crisp and clear audio reproduction.

The headphones outperform similarly priced alternatives thanks to a greater frequency response (from 10Hz to 41kHz). The headphones’ ability to replicate a larger range of frequencies, from the highest to the lowest, is thanks to this extended frequency response.

The headphones have a high dynamic range, which means they can withstand a wide range of volumes without degrading their quality. The quality is clean and well-balanced, with each instrument and vocal delineated from one another.

This product provides a more balanced sound profile than other high-end headphones, meaning they do not emphasize one frequency band. Because of their lack of bias, they are a great option for musicians and audiophiles who value authenticity in their listening experience.

These headphones have excellent acoustic performance. They have an expansive frequency and dynamic range and deliver exceptional detail and clarity.

Connectivity and Features

A 3-meter cable with a 6.35mm jack for home audio equipment and a 1.2-meter cable with a 3.5mm jack for use with portable devices are included with the Sennheiser HD 660 S headphones. Each cable is of excellent quality and made to prevent any signal degradation.

The headphones work with various audio sources, from mobile devices to high-end DACs and amplifiers. The headphones feature an impedance of 150 ohms, which is a little more than average but still low. Because of this increased impedance, the headphones produce such excellent sound.

The ear cups on the headphones are removable, which is a nice touch. If the ear pads ever get worn out or broken, you may simply take out the ear cups and replace them. So, the headphones are protected during travel by a soft case in the package.

These headphones generally have many useful connections and extras. They will work with various audio devices and come with two high-quality cords. Also, their detachable ear cups and carrying case enhance the headphones’ portability.

Competitors Comparison

This model is a premium option that can hold its own against similarly priced alternatives. Some of their rivals are listed below, along with how they fare in comparison.

The Beyerdynamic DT 1990 Pro are high-quality headphones that cost around the same as the Sennheiser HD 660 S. Compared to the HD 660 S, the Beyerdynamic headphones feature a more pronounced treble response, which some listeners may prefer. Sennheiser headphones, on the other hand, feature a more neutral sound and a wider frequency response.

If you’re looking for high-quality audio at a premium price, go no further than the Focal Clear headphones, which are significantly more expensive than the Sennheiser HD 660 S. Some listeners may prefer the Focal headphones over the HD 660 S due to their boosted bass response. Conversely, the Sennheisers have a more neutral sound profile and a wider frequency response.

If you’re looking for an alternative to the Sennheiser HD 660 S headphones without sacrificing sound quality, consider the Audeze LCD-2. The Audeze headphones are more open and have a more pronounced bass response than the HD 660 S. The Sennheiser headphones, on the other hand, offer a more neutral sound and a wider frequency range.

Compared to other high-end headphones available at a similar price point, the Sennheiser HD 660 S holds its own. Unlike some of its rivals, these headphones provide superior sound quality, a wide frequency response, and a more neutral sound profile.


If you’re an audiophile who insists on the highest possible quality, go no further than this piece. The headphones provide a neutral sound profile compared to other high-end headphones, a wide frequency response, and a solid dynamic range.

The headphones are sturdy and pleasant to put on, with removable ear cups for when the pads get worn out. With two high-quality connections and backward compatibility with most audio devices, they’re a great pick for either stationary or on-the-go listening.

These headphones are on the pricier end of the market, but they hold their own against similarly-featured alternatives. So, these headphones are a terrific investment for musicians and audiophiles because of their high sound quality and sturdy construction.

Sennheiser HD 660 S HiRes Audiophile Headphones Review
Sennheiser HD 660 S HiRes Audiophile Headphones Review


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