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Sennheiser HD 660 S Review | 93 Data compared

Avg. price in UK: ~£380
Avg. price in US: ~$500
Form factor: over-ear
Connectivity: wired
Battery life: N/A hours
Active noise cancellation (ANC): no

Sennheiser HD 660 S review. Compare 93 technical specifications and user reviews to see how it ranks among headphones and if it is worth buying.

5.0

Good

3.9

Poor

9.4

Exceptional

2.1
Gaming
Score components:
35.0%
0.0
Audio latency
25.0%
0.0
Low-latency game mode
20.0%
10
Can be used as a headset
12.0%
1.0
Noise-canceling microphone
8.0%
0.0
Battery life
1.0
Travel
Score components:
28.0%
1.0
Active noise cancellation (ANC)
24.0%
0.0
Battery life
18.0%
4.2
Weight
16.0%
0.0
Multipoint support
14.0%
0.0
Ambient sound mode
2.7
Calls
Score components:
28.0%
1.0
Noise-canceling microphone
24.0%
10
Can be used as a headset
18.0%
0.0
Multipoint support
16.0%
0.0
Battery life
14.0%
0.0
Companion app
3.4
Workout
Score components:
28.0%
4.2
Weight
24.0%
1.0
Water resistance
20.0%
4.0
IP rating
16.0%
0.0
Battery life
12.0%
10
Can be used as a headset

Best prices in UK

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Best rankings

Verdict

The Sennheiser HD 660 S is a high-end, open-back dynamic headphone featuring a 150-ohm impedance and a frequency response of 10 Hz to 41,000 Hz, driven by specially developed transducers with lightweight aluminium voice coils. Known for its natural, detailed, and non-fatiguing sound signature, it excels with a lush midrange, smooth treble, and exceptional instrument separation, all housed in a lightweight 260g chassis with comfortable velour ear pads. While its lower impedance makes it more versatile for use with mobile devices than its predecessors, its sub-bass rolls off significantly below 80 Hz, and the soundstage is relatively narrow with a strong initial clamping force.

Technical Specifications of Sennheiser HD 660 S

Overall score

5.0

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Popularity

What it is: An indicator based on the number of reviews received by the headphones.

When it matters: When you prefer headphones that have already been chosen and reviewed by many other users.

Sound

4.5

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Active noise cancellation (ANC)

What it is: Reduces background noise using active technology

When it matters: When blocking office, travel, or aircraft noise is a priority.

Importance: HIGH

Driver type

What it is: Type of speaker driver technology used

When it matters: When the underlying sound character and driver technology matter to you.

Importance: MEDIUM

dynamic

Driver size

What it is: Diameter of the speaker driver unit

When it matters: When you want extra hardware context behind how the headphones may handle bass weight, scale, or overall presentation.

Importance: MEDIUM

Number of drivers

What it is: Total number of speaker drivers per earcup

When it matters: When multi-driver designs are part of your buying criteria.

Importance: LOW

Lowest frequency

What it is: Lowest audio frequency the headphones can reproduce

When it matters: When deeper bass extension matters for your music or movie listening.

Importance: MEDIUM

Good value: <=10 Hz

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Calls & Controls

2.8

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Noise-canceling microphone

What it is: Built-in microphone reduces background noise during calls

When it matters: When you take calls in busy spaces and want your voice to stay clearer.

Importance: MEDIUM

Can be used as a headset

What it is: Shows whether the headphones can handle voice chat and calls in addition to normal audio playback.

When it matters: When one pair needs to cover music, calls, meetings, and gaming chat.

Importance: MEDIUM

Number of microphones

What it is: Total number of built-in microphones

When it matters: When call pickup quality and beamforming support matter to you.

Importance: LOW

Good value: >=2

Boom microphone

What it is: Includes detachable boom microphone for voice clarity

When it matters: When you need stronger voice clarity for gaming, streaming, or work calls.

Importance: LOW

Microphone SNR

What it is: Signal-to-noise ratio of the microphone

When it matters: When call clarity matters and you want your voice picked up more cleanly instead of buried in background hiss.

Importance: LOW

Good value: >80 dB

N/A

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Connectivity

2.9

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Connectivity

What it is: Available connection methods (wired, wireless, Bluetooth, etc.)

When it matters: When the headphones need to match how you listen across wired and wireless devices.

Importance: HIGH

Bluetooth version

What it is: Version of Bluetooth technology supported

When it matters: When wireless stability, efficiency, and feature support matter more than treating Bluetooth as a box-check spec.

Importance: MEDIUM

Good value: >=5.0

N/A

Maximum Bluetooth range

What it is: Maximum wireless operating distance from source device

When it matters: When you move around rooms and want fewer dropouts from your source device.

Importance: LOW

Good value: >=10 m

N/A

Audio latency

What it is: Delay between audio and video in wireless mode

When it matters: When you watch video or play games and need sound to stay in sync.

Importance: HIGH

Good value: <60 ms

N/A

Multipoint support

What it is: Supports simultaneous connections to multiple devices

When it matters: When you switch often between a phone and a laptop during the day.

Importance: MEDIUM

N/A

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Features

2.7

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Ambient sound mode

What it is: Allows external sounds to pass through for awareness

When it matters: When you need to stay aware of traffic, voices, or announcements.

Importance: MEDIUM

N/A

EQ support

What it is: Allows customization of sound profile via equalizer

When it matters: When the stock tuning is not enough and you want to shape bass, mids, or treble to match your taste.

Importance: MEDIUM

Companion app

What it is: Dedicated mobile app for customization and updates

When it matters: When software customization, updates, and extra controls matter.

Importance: MEDIUM

N/A

Adjustable ANC levels

What it is: Allows adjustment of noise cancellation intensity levels

When it matters: When you move between quiet rooms, offices, streets, and public transport and do not want one ANC setting for every situation.

Importance: LOW

Good value: >=4

N/A

Voice assistant support

What it is: Compatible with voice assistants like Siri, Alexa, or Google Assistant

When it matters: When hands-free control is part of your daily routine.

Importance: LOW

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Battery

1.0

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Battery life

What it is: Playback time on a single charge

When it matters: When you commute, travel, or work long shifts and do not want charging breaks to interrupt listening.

Importance: HIGH

Good value: >45 hours

N/A

Battery life with ANC

What it is: Playback time with active noise cancellation enabled

When it matters: When you plan to keep noise cancellation on for most of the day.

Importance: HIGH

Good value: >40 hours

N/A

Charging time

What it is: Time required for a full battery charge

When it matters: When you often need the headphones ready again after short breaks.

Importance: MEDIUM

Good value: <=2 hours

N/A

Quick charge

What it is: Provides quick playback time with short charging period

When it matters: When a short top-up needs to deliver useful playback before you leave.

Importance: MEDIUM

N/A

Battery capacity

What it is: Total energy storage of the internal battery

When it matters: When you are estimating how much battery headroom the design may have before relying only on the official runtime claim.

Importance: MEDIUM

Good value: >=720 mAh

N/A

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Design

6.3

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Brand name

What it is: The manufacturer or brand of the product.

When it matters: When you prefer a specific ecosystem, support network, or design philosophy.

Importance: MEDIUM

Sennheiser

Form factor

What it is: Overall design type of the headphones (over-ear, on-ear, in-ear, etc.)

When it matters: When comfort, portability, and isolation depend on the overall headphone style.

Importance: HIGH

over-ear

Weight

What it is: Total weight of the headphones

When it matters: When long listening sessions make wearing comfort more important.

Importance: MEDIUM

Good value: <150 g

Acoustic design

What it is: Type of acoustic design (open-back, closed-back, semi-open)

When it matters: When you need the right balance of isolation, leakage, and soundstage.

Importance: HIGH

open-back

Clamp force

What it is: Amount of clamping pressure applied to the head

When it matters: When comfort and fit security matter during long sessions.

Importance: MEDIUM

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Sennheiser HD 660 S vs the average headphone

Why is Sennheiser HD 660 S better than the average headphone?

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Hi-Res Audio certification
Sennheiser HD 660 S has Hi-Res Audio certification, the average headphone does not. 22.9% of headphones are Hi-Res Audio certified.
What it is: Certified for high-resolution audio playback
When it matters: When official support for high-resolution playback matters to you.
Importance: LOW
Sennheiser HD 660 S has Hi-Res Audio certification, the average headphone does not. 22.9% of headphones are Hi-Res Audio certified.
Spatial audio support
Sennheiser HD 660 S supports spatial audio, the average headphone does not. 30.7% of headphones support spatial audio.
What it is: Supports immersive surround sound playback
When it matters: When movies, games, and immersive mixes are part of your listening.
Importance: MEDIUM
Sennheiser HD 660 S supports spatial audio, the average headphone does not. 30.7% of headphones support spatial audio.
2 mm larger driver size
Sennheiser HD 660 S uses a larger driver size than the average headphone (42 mm vs 40 mm). The average headphones use a driver size of 40 mm.
What it is: Diameter of the speaker driver unit
When it matters: When you want extra hardware context behind how the headphones may handle bass weight, scale, or overall presentation.
Importance: MEDIUM
Sennheiser HD 660 S uses a larger driver size than the average headphone (42 mm vs 40 mm). The average headphones use a driver size of 40 mm.42 mm vs 40 mm
21,500 Hz higher treble extension
Sennheiser HD 660 S has a higher highest frequency than the average headphone (41,500 Hz vs 20,000 Hz). The average headphones reach a highest frequency of 20,000 Hz.
What it is: Highest audio frequency the headphones can reproduce
When it matters: When treble extension and overall frequency reach matter to you.
Importance: MEDIUM
Good value: >=24000 Hz
Sennheiser HD 660 S has a higher highest frequency than the average headphone (41,500 Hz vs 20,000 Hz). The average headphones reach a highest frequency of 20,000 Hz.41500 Hz vs 20000 Hz
0.26 % lower distortion
Sennheiser HD 660 S has a lower total harmonic distortion than the average headphone (0 % vs 0.3 %). The average headphones have total harmonic distortion of 0.3 %.
What it is: Percentage of harmonic distortion in audio output
When it matters: When cleaner sound reproduction matters at louder volumes.
Importance: LOW
Good value: <=1%
Sennheiser HD 660 S has a lower total harmonic distortion than the average headphone (0 % vs 0.3 %). The average headphones have total harmonic distortion of 0.3 %.0.04 % vs 0.3 %
9 Hz lower bass extension
Sennheiser HD 660 S has a lower lowest frequency than the average headphone (9 Hz vs 18 Hz). The average headphones reach a lowest frequency of 18 Hz.
What it is: Lowest audio frequency the headphones can reproduce
When it matters: When deeper bass extension matters for your music or movie listening.
Importance: MEDIUM
Good value: <=10 Hz
Sennheiser HD 660 S has a lower lowest frequency than the average headphone (9 Hz vs 18 Hz). The average headphones reach a lowest frequency of 18 Hz.9 Hz vs 18 Hz
10 mm more spacious earcup height
Sennheiser HD 660 S offers more spacious earcup height than the average headphone (70 mm vs 60 mm). The average headphones offer an inner earcup height of 60 mm.
What it is: Internal height of the earcup cavity
When it matters: When larger ears need enough space inside the earcups.
Importance: MEDIUM
Sennheiser HD 660 S offers more spacious earcup height than the average headphone (70 mm vs 60 mm). The average headphones offer an inner earcup height of 60 mm.70 mm vs 60 mm
Open-back design
Sennheiser HD 660 S uses an open-back design, while the average headphone does not. 9.3% of headphones have an open-back design.
What it is: Shows whether the headphones use an open-back housing that lets air and sound pass through more freely than a closed design.
When it matters: When you listen in quiet places and care more about spacious sound than blocking outside noise or preventing sound leakage.
Importance: MEDIUM
Sennheiser HD 660 S uses an open-back design, while the average headphone does not. 9.3% of headphones have an open-back design.
10 mm more spacious earcup height
Sennheiser HD 660 S offers more spacious earcup height than the average headphone (70 mm vs 60 mm). The average headphones offer an inner earcup height of 60 mm.
1.8 m more useful cable length
Sennheiser HD 660 S offers a more useful cable length than the average headphone (3 m vs 1.2 m). The average headphones have a cable length of 1.2 m.
Open-back design
Sennheiser HD 660 S uses an open-back design, while the average headphone does not. 9.3% of headphones have an open-back design.
Hi-Res Audio certification
Sennheiser HD 660 S has Hi-Res Audio certification, the average headphone does not. 22.9% of headphones are Hi-Res Audio certified.
Spatial audio support
Sennheiser HD 660 S supports spatial audio, the average headphone does not. 30.7% of headphones support spatial audio.
2 mm larger driver size
Sennheiser HD 660 S uses a larger driver size than the average headphone (42 mm vs 40 mm). The average headphones use a driver size of 40 mm.
21,500 Hz higher treble extension
Sennheiser HD 660 S has a higher highest frequency than the average headphone (41,500 Hz vs 20,000 Hz). The average headphones reach a highest frequency of 20,000 Hz.
9 Hz lower bass extension
Sennheiser HD 660 S has a lower lowest frequency than the average headphone (9 Hz vs 18 Hz). The average headphones reach a lowest frequency of 18 Hz.
0.26 % lower distortion
Sennheiser HD 660 S has a lower total harmonic distortion than the average headphone (0 % vs 0.3 %). The average headphones have total harmonic distortion of 0.3 %.
2 dB/mW higher sensitivity
Sennheiser HD 660 S has a higher sensitivity than the average headphone (104 dB/mW vs 102 dB/mW). The average headphones have sensitivity of 102 dB/mW.

Why is Sennheiser HD 660 S worse than the average headphone?

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19.3% higher weight
Sennheiser HD 660 S is heavier than the average headphone (260 g vs 218 g). The average pair of headphones weighs 218 g.
1.7 higher clamp force
Sennheiser HD 660 S has a higher clamp force than the average headphone (6 vs 4.3). The average headphones have a clamp force of 4.3.
Tangle-prone cable
Sennheiser HD 660 S uses a tangle-prone cable, while the average headphone is easier to manage. 64.2% of headphones use a tangle-free cable.
No travel bag
Sennheiser HD 660 S does not include a travel bag, the average headphone does. 65.2% of headphones include a travel bag.
3 mm tighter earcup width
Sennheiser HD 660 S has tighter earcup width than the average headphone (40 mm vs 43 mm). The average headphones offer an inner earcup width of 43 mm.
No passive noise reduction
Sennheiser HD 660 S does not offer passive noise reduction, while the average headphone does. 82.7% of headphones have passive noise reduction.
1 fewer microphones
Sennheiser HD 660 S has fewer microphones than the average headphone (0 vs 1). The average headphones have 1 microphones.
No voice assistant support
Sennheiser HD 660 S does not support voice assistants, the average headphone does. 60.8% of headphones support voice assistants.
No passive noise reduction
Sennheiser HD 660 S does not offer passive noise reduction, while the average headphone does. 82.7% of headphones have passive noise reduction.
What it is: Shows whether the headphones reduce outside noise through physical sealing, fit, and materials rather than active electronics.
When it matters: When you want better isolation from fit and seal alone, even with ANC turned off or not available.
Importance: MEDIUM
Sennheiser HD 660 S does not offer passive noise reduction, while the average headphone does. 82.7% of headphones have passive noise reduction.
No voice assistant support
Sennheiser HD 660 S does not support voice assistants, the average headphone does. 60.8% of headphones support voice assistants.
What it is: Compatible with voice assistants like Siri, Alexa, or Google Assistant
When it matters: When hands-free control is part of your daily routine.
Importance: LOW
Sennheiser HD 660 S does not support voice assistants, the average headphone does. 60.8% of headphones support voice assistants.
19.3% higher weight
Sennheiser HD 660 S is heavier than the average headphone (260 g vs 218 g). The average pair of headphones weighs 218 g.
What it is: Total weight of the headphones
When it matters: When long listening sessions make wearing comfort more important.
Importance: MEDIUM
Good value: <150 g
Sennheiser HD 660 S is heavier than the average headphone (260 g vs 218 g). The average pair of headphones weighs 218 g.260 g vs 218 g
1.7 higher clamp force
Sennheiser HD 660 S has a higher clamp force than the average headphone (6 vs 4.3). The average headphones have a clamp force of 4.3.
What it is: Amount of clamping pressure applied to the head
When it matters: When comfort and fit security matter during long sessions.
Importance: MEDIUM
Sennheiser HD 660 S has a higher clamp force than the average headphone (6 vs 4.3). The average headphones have a clamp force of 4.3.6 vs 4.3
4.22x more expensive
Sennheiser HD 660 S is more expensive than the average headphone (£380 vs £90).
Sennheiser HD 660 S is more expensive than the average headphone (£380 vs £90).£380 vs £90
1 fewer microphones
Sennheiser HD 660 S has fewer microphones than the average headphone (0 vs 1). The average headphones have 1 microphones.
What it is: Total number of built-in microphones
When it matters: When call pickup quality and beamforming support matter to you.
Importance: LOW
Good value: >=2
Sennheiser HD 660 S has fewer microphones than the average headphone (0 vs 1). The average headphones have 1 microphones.0 vs 1
Tangle-prone cable
Sennheiser HD 660 S uses a tangle-prone cable, while the average headphone is easier to manage. 64.2% of headphones use a tangle-free cable.
What it is: Cable designed to resist tangling
When it matters: When you often carry wired headphones in a bag or pocket.
Importance: LOW
Sennheiser HD 660 S uses a tangle-prone cable, while the average headphone is easier to manage. 64.2% of headphones use a tangle-free cable.
No travel bag
Sennheiser HD 660 S does not include a travel bag, the average headphone does. 65.2% of headphones include a travel bag.
What it is: Comes with a protective carrying case or pouch
When it matters: When protection in transit matters right out of the box.
Importance: LOW
Sennheiser HD 660 S does not include a travel bag, the average headphone does. 65.2% of headphones include a travel bag.

Calls & Controls

Graphic comparison of Sennheiser HD 660 S and

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Third-party reviews

United Kingdom

United States

(Reviews last updated: June 2026)

What customers like about Sennheiser HD 660 S?

Exceptional midrange clarity, providing natural and lifelike vocals and instrumentals
Improved detail retrieval and resolution compared to its predecessors (HD 600 and HD 650)
Highly comfortable and lightweight design suitable for long listening sessions once broken in
Easier to drive than previous 600-series models due to lower 150-ohm impedance
Excellent imaging and instrument separation, making them effective for critical listening and gaming
Durable, proven build quality with easily replaceable parts like earpads and cables

What customers dislike about Sennheiser HD 660 S?

Noticeable lack of sub-bass extension, with significant roll-off starting around 80Hz
Relatively narrow soundstage that can feel intimate or 'in-your-head' compared to competitors
High out-of-the-box clamping force that may be uncomfortable until the headband stretches
Muffled or 'veiled' treble for some listeners, lacking the 'air' or sparkle found in brighter headphones
Questionable value at original MSRP when compared to the much cheaper HD 6XX or Sundara
Pads wear out relatively quickly and require periodic replacement to maintain sound quality

Expert reviews

majorhifi.com

31/10/2017

Back In Black - Sennheiser HD 660 S Review Are you looking for these reviews to compare the HD 660 S against a specific older model like the HD 650?

The Sennheiser HD 660 S updates the legendary 600 series with a darker, matte black and anthracite color scheme and a significantly reduced impedance of 150 Ohms, making it twice as easy to power as its predecessors. In the box, users receive the over-ear open-back headphones alongside a 1/4" (6.35mm) unbalanced cable, a 4.4mm balanced Pentaconn cable, and a 1/8" (3.5mm) adapter....Read more

enjoythemusic.com

01/05/2018

Sennheiser HD 660 S Over-Ear Headphone Review

The Sennheiser HD 660 S over-ear headphone ($499) serves as a modern, portable-friendly update to the classic HD 650 model. It features a lower impedance of 150 ohms (reduced from 300 ohms), making it significantly easier to drive using portable digital audio players (DAPs) and entry-level gear without requiring expensive external amplification. In terms of sonic performance, the...Read more

rtings.com

27/06/2024

Sennheiser HD 660 S Headphones Review

The Sennheiser HD 660 S are high-quality, open-back headphones praised for their neutral sound, exceptional mid-range accuracy, and comfortable, stable design suitable for long listening sessions. They are highly rated for wired gaming and deliver consistent frequency response, making them ideal for critical listening in quiet environments. RTINGS.comHowever, the review notes they...Read more

soundguys.com

28/11/2024

Sennheiser HD 660S review Would you like a similar list for specific amplifier pairings or comparison articles between this model and the HD 600?

The SoundGuys review of the Sennheiser HD 660S highlights their durable, lightweight construction, comfortable fit for extended use, and a sound profile closely trailing the analytical tuning of the HD 600. Key pros include exceptional, detailed audio performance and robust, comfortable design suitable for critical listening. However, a key con is that the audio deviates slightly...Read more

loudersound.com

01/06/2023

Sennheiser HD 660S headphones review

The Sennheiser HD 660S are wired, open-back headphones launched in 2017 that remain an excellent audio choice. They feature a comfortable, lightweight 260g design made of smooth black plastic with an eye-catching stainless-steel outer grille. This model uses 42mm drivers with a 150-ohm impedance, making them easy to plug into portable devices like smartphones. Users will find great...Read more

audiosciencereview.com

08/06/2022

Sennheiser HD660S Review (Headphone)

The Sennheiser HD660S is an open-back headphone priced at $400 that maintains the visual identity and core design DNA of its predecessors, the HD600 and HD650. In terms of performance pros, the redesign successfully lowers the impedance by half compared to the HD650, reducing the dependency on high-voltage amplification and making it considerably more mobile-friendly and easier to...Read more

techpowerup.com

18/09/2018

Sennheiser HD 660 S Review - Audio Performance

The Sennheiser HD 660 S provides a detailed, clean audio experience with a standout midrange and precise spatial imaging, suitable for both music and gaming. A notable improvement is the reduced 150-ohm impedance, which makes these headphones easier to drive, while the overall sound profile is versatile. However, the review highlights a significant lack of sub-bass extension....Read more

expertreviews.co.uk

04/06/2018

Sennheiser HD 660 S: A classic headphone, reimagined

Based on the provided review, the Sennheiser HD 660 S is a reimagined, open-backed over-ear headphone that modernizes the design DNA of its legendary predecessors, the HD 580, HD 600, and HD 650. Retailing at approximately £430, this model features an understated all-black aesthetic and is engineered to be less demanding of partnering amplification, allowing users to drive it...Read more

stereonet.com

21/05/2018

Review: Sennheiser HD 660 S Over-Ear Headphones

The StereoNET review of the Sennheiser HD 660 S highlights the headphones as an exceptional evolutionary step in the HD 600 series, praising their technical refinement, forward midrange, and outstanding imaging. Key advantages include a clean, tightly driven bass response and a highly breathable open-back design that remains comfortable during long, private listening sessions....Read more

headfonia.com

03/04/2018

Sennheiser HD 660S - Review

The Headfonia review characterizes the Sennheiser HD 660S as a versatile, open-back hybrid that balances the speed of the HD 600 with the musicality of the HD 650, featuring a 150-ohm impedance that makes it easy to drive via portable players. Key pros include excellent resolution, precise imaging, and enhanced performance when using the included 4.4mm balanced cable. Conversely,...Read more

theaudiophileman.com

22/02/2018

Sennheiser HD 660 S: Keeping It In The Family

The Sennheiser HD 660 S represents an evolution of the iconic HD 580 and HD 650 lineage, introducing a re-engineered in-house transducer design, aluminum voice coils, and a precision stainless steel fabric diaphragm contour. Weighing 260g with elliptical ear cups, these open-backed headphones provide a firm yet comfortable grip. A significant technical upgrade is their lower 150 Ohm...Read more

gavinsgadgets.com

13/01/2018

Sennheiser HD 660s Headphone Review – The legend continues

The Sennheiser HD 660sGo review by Gavin Fabiani-Laymond highlights these open-back headphones as an investment-worthy successor to the legendary HD 650, sharing an identical physical footprint that allows for interchangeable parts. A major pro is the drop in impedance to 150 ohms (with 104dB sensitivity), making them much easier to power from portable equipment like the LG V30 than...Read more

stereophile.com

16/12/2017

Sennheiser HD 660 S Over-Ear Open Headphones

The Sennheiser HD 660 S, reviewed on Stereophile, offers a modernized design with a 150-ohm impedance that makes it efficient for portable use, providing a forward, impactful sound that reduces the traditional "Sennheiser veil". The headphones include comfortable, thick ear pads and a 4.4mm balanced cable, representing a more versatile, lightweight, and stealthy update to the...Read more

head-fi.org

05/11/2017

Sennheiser HD 660 S - Reviews

Sennheiser HD 660 S community reviews highlight an open-back design with a lower 150-ohm impedance, making it easier to drive via portable gear. Strengths include exceptional resolution, intimate vocals, a smooth treble, and high comfort, though users note a significant sub-bass roll-off and an intimate, narrow soundstage. Reviewers also mention a high initial headband clamping...Read more

bonedo.de

22/03/2018

Sennheiser HD 660 S Review

Based on the review, the Sennheiser HD 660 S is an open-back, dynamic over-ear headphone that weighs a lightweight 260g and is built with a functional, mostly plastic design suitable for studio and home use. Originally marketed toward music enthusiasts, this model excels as an affordable, professional-grade tool for mixing and mastering because it avoids artificial frequency boosts...Read more

hifitest.de

14/11/2018

Sennheiser HD 660 S - Hi-Fi Headphones Review

The Sennheiser HD 660 S is an open-back, over-ear high-fidelity headphone that updates the classic HD 650 design. Priced around 500 Euros, it features newly designed drivers with a lower impedance of 150 Ohms and a precision stainless steel mesh to control diaphragm movement. The headphones offer excellent comfort with a lightweight 260-gram body and soft velour ear pads that handle...Read more

kopfhoerer.de

06/02/2018

Sennheiser HD 660 S im Test bei kopfhoerer.de

The Sennheiser HD 660 S is an open-back, high-end over-ear headphone designed for analytical studio work and premium home listening, originally retailing for 499 Euros. Sonically, it delivers a highly balanced and detailed reproduction across a wide 10 Hz to 41,000 Hz frequency response. Key strengths highlighted in the review include its exceptional transient response, an expansive...Read more

stereo.de

01/02/2018

Sennheiser HD 660 S - Review Results from LowBeats

According to Stereo.de, the Sennheiser HD 660 S is lauded as a masterpiece delivering a balanced, highly musical sound with excellent instrument separation and structural precision. Key advantages include reduced 150-ohm impedance, allowing for easier driving with mobile devices, and versatility for both professional studio use and relaxed home listening. Conversely, the review...Read more

computerbild.de

03/01/2021

Headphone Review: Sennheiser HD 660 S - COMPUTER BILD

The Sennheiser HD 660 S is a premium, open-back headphone designed primarily for home use rather than on-the-go listening. Sennheiser lowered the impedance to 150 ohms—down from the 300 ohms found on its predecessors, the HD 600 and HD 650—to make it more compatible with mobile devices. However, its mobile performance remains limited due to restricted maximum volume and the...Read more

fairaudio.de

05/06/2018

Review: Sennheiser HD 660 S - open-back headphones - fairaudio

The Sennheiser HD 660 S is an open-back, dynamic over-ear headphone that acts as a direct, cleaner-sounding successor to the popular HD 650. It features a redesigned, hand-selected driver system and a reduced 150-ohm impedance, making it easier to drive with various sources. The build includes a robust, matte-black plastic chassis, weighing a light 260 grams, which provides a secure...Read more

lowbeats.de

13/12/2018

Sennheiser HD 660 S Review – The Affordable High-End Headphones

The LowBeats review defines the Sennheiser HD 660 S as an exceptional, affordable high-end reference in the sub-500-euro category, praised for its balanced, natural, and transparent sound signature. A key pro is its 150-ohm impedance, which, paired with comfortable, lightweight construction, enhances versatility across diverse amplification sources. However, the analysis notes a...Read more

hifi.de

20/04/2021

Sennheiser HD 660S - Open-back Hi-Fi headphones with high-fidelity sound

The Sennheiser HD 660S is an open-back, over-ear HiFi headphone priced at an MSRP of 499 Euro (street price around 399 Euro) that delivers an incredibly balanced, natural, and warm musical soundscape. Weighing a lightweight 260 grams, it features an elegant matte black design with outer metal grilles on the earcups that leave the inner transducers visible. The review highlights...Read more

kopfhoerer.de

18/06/2020

Sennheiser HD 660 S (New 2019 Version) - kopfhoerer.de

The Sennheiser HD 660 S (2019 Revision) is an open-back, dynamic over-ear headphone designed for both analytical studio monitoring and high-end HiFi listening. This updated model features minor aesthetic revisions, including slightly shorter headband extensions, more distinct contours, and reshaped, angular ear cup arms that deliver a cleaner, higher-quality appearance. Its internal...Read more

on-mag.fr

20/11/2017

Sennheiser HD 660 S Review - ON-mag: Front Page

The ON-mag France review details the Sennheiser HD 660 S as a modernised lifting of the classic HD 650, updating a recipe that has worked for over ten years to keep the icon relevant in the high-end Hi-Fi market. Weighing 260 grams and featuring an open-back, circum-aural wired design, the headphones are priced officially at 500 €. Architecturally, the review praises the unit for...Read more

leclaireur.fnac.com

10/02/2018

Sennheiser HD 660 S Lab Test: A highly capable open-back model

The Sennheiser HD 660 S is a high-performing open-back headphone succeeding the legendary HD 650, specifically targeting audiophiles seeking natural, high-fidelity sound. It features an elegant, matte-black design equipped with oversized earcups wrapped in comfortable velour, providing an overall lightweight feel at just 260 grams. In terms of performance, the headphones deliver...Read more

fr.audiofanzine.com

30/04/2018

Sennheiser HD 660 S Review: The Successor to the HD 650

The Sennheiser HD 660 S is evaluated as a successor to the legendary HD 650, bringing a lowered impedance of 150 ohms (down from 300 ohms) and increased sensitivity to better accommodate portable devices like smartphones. Visually, it features a darker, matte finish along with a new transducer design aimed at delivering better membrane control. However, acoustic testing conducted...Read more

on-mag.fr

23/02/2018

Sennheiser HD 660 S Review: A Hi-Fi Headphone of Pure Precision and Finesse", "Sennheiser HD 660 S Test: Hi-Fi Headphones with Absolute Precision and...

The Sennheiser HD 660 S is an open-back, circumaural hi-fi headphone designed as a modern optimization of the iconic HD 650. Retaining the classic lightweight build and oval ear cups, it updates the aesthetic with a sober, dark grey matte finish. On the technical side, the headphone features 40 mm dynamic drivers with upgraded specs, including a reduced impedance of 150 ohms (down...Read more

gouforit.com

13/01/2026

Sennheiser HD 660 S Headphones - Review and Opinion - Gouforit

The Sennheiser HD 660 S open-back dynamic headphones offer an excellent entry point into the audiophile world, serving as the successors to the famous HD 600 and HD 650 models. Weighing only 260 grams, they feature a lightweight plastic build with a metallic black finish and comfortable elliptical ear pads that isolate sound well but might fit tightly on larger heads initially. Tech...Read more

misauriculares.com

10/07/2019

Sennheiser HD 660 S Review - misauriculares.com

The reviewer provides a highly positive, personal evaluation of the open-back, dynamic Sennheiser HD 660 S headphones, noting that while they resemble the HD 600, they feature an elegant smooth finish and a solid, long-lasting build. Initially, the headphones presented an uncomfortable, rigid clamp force, but this pressure completely disappeared after two months of daily use,...Read more

afdigitale.it

21/02/2018

Sennheiser HD 660 S - The pleasure of listening - AF Digitale

The Sennheiser HD 660 S is an open-back dynamic headphone developed from the previous HD 650 model, aiming to deliver a highly realistic and natural listening experience across both digital and analogue music formats. Hand-selected and hand-assembled transducers limit harmonic distortion and restrict channel tolerance to just 1 dB to maintain consistent audio quality across both ear...Read more

newmusicalinstruments.it

25/05/2021

Sennheiser HD 660S, high-class headphone monitoring

Overview and Pros The Sennheiser HD 660S is an open-back dynamic headphone deeply rooted in the brand's long-standing design principles, balancing technical precision with premium comfort. Weighing only 260 grams, it features large elliptical ear cups lined with soft velour and an effective foam-padded headband that perfectly balances its 6-Newton clamping force for long,...Read more

hynerd.it

09/03/2023

Sennheiser HD660S Review - The Audiophile Headphones

The Sennheiser HD660S is an open-back, over-ear headphone praised for delivering an exceptionally natural, smooth, and detailed audio performance, particularly across the vocal and mid-range frequencies. Weighing roughly 260 grams and featuring a lightweight matte-black plastic chassis, a flexible headband, and plush 70mm x 40mm ear cushions, it provides excellent comfort for...Read more

techtesters.eu

22/02/2018

Sennheiser HD 660 S review - Techtesters

The Sennheiser HD 660 S open-back headphones deliver exceptional, fast, and highly accurate sound reproduction across almost every musical genre, making it easy to discern tight details that cheaper drivers blur together. While typical open designs struggle with low-end frequencies, this model provides excellent, punchy bass and natural acoustics without the suffocating, unnatural...Read more

hifi.nl

09/12/2017

Review Sennheiser HD 660 S A classic reborn

The Sennheiser HD 660 S is a successful, subtle upgrade to the legendary HD 650 open-back headphones, maintaining the beloved classic sound signature while refining its overall performance. It introduces an entirely new, tightly matched dynamic driver design that lowers the impedance from 300 ohms down to 150 ohms, making the headphones significantly easier to power with a wider...Read more

gadgetgear.nl

23/04/2018

Sennheiser HD 660S Review - GadgetGear.nl

The Sennheiser HD 660S, reviewed by GadgetGear, is praised as an open-back successor to the HD 650, featuring improved drivability due to a lower 150-ohm impedance, which allows for better performance with mobile devices. It maintains a familiar, well-regarded tonality while offering superior acoustic detail and refinement compared to its predecessor. Conversely, the review notes...Read more

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