OVERALL
ALTERNATIVES
SPECS
VS AVERAGE
REVIEWS
Scored using Headphones Methodology v1.0
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Products in this category are scored under Frontum Headphones Methodology v1.0: technical specifications plus authentic consumer ratings, with 0% commercial bias.
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Sennheiser HD 660s2 Review | 93 Data compared

Avg. price:~£390Form factor:over-earConnectivity:wiredBattery life:N/A hoursActive noise cancellation (ANC):no

Sennheiser HD 660s2 Review: Compare 93 technical specifications and user reviews to see how this product ranks in the Headphones category and whether it is worth buying.

5.7/10

Overall score

Score
5.7/ 10
✕
What it is
An overall evaluation of the headphones' quality, based on technical analyses and user reviews.
When it matters
When you need a quick reference to identify the best headphones on the market.
Score distribution
▼
<55-66-77-88-99-10
▼ Worse than 79% of models
Score components

80%

5.0

Technical score

20%

8.4

User score

▼Worse than 79% of headphones
6.5

Value for money

Value for money
6.5/ 10
✕
What it is
An indicator that combines the headphones' overall rating with their cost.
When it matters
When you are looking for headphones that offer a strong balance of performance, features, and price.
Score distribution
▼
<55-66-77-88-99-10
▼ Worse than 91% of models
Score components

70%

5.7

Overall score

30%

8.5

Price

▼Worse than 91%
5.0

Technical score

Technical score
5.0/ 10
✕
What it is
An assessment of technical performance for products in the Headphones category across these key areas: Sound, Calls & Controls, Connectivity, Features, Battery, Design.
When it matters
When you want to compare headphones based on technical performance and available features.
Score distribution
▼
<55-66-77-88-99-10
▼ Worse than 92% of models
Score components

52%

5.5

Sound

20%

4.0

Features

10%

6.4

Design

8%

4.0

Connectivity

6%

4.0

Battery

4%

3.8

Calls & Controls

▼Worse than 92%
8.4

User score

User score
8.4/ 10
✕
What it is
A rating that combines user reviews and the total number of reviews received by the headphones.
When it matters
When you want to understand how headphones perform in real listening and how reliable they are in terms of comfort, audio quality, battery life, and long-term use.
Score distribution
▼
<55-66-77-88-99-10
▲ Better than 81% of models
Score components

70%

8.8

User ratings

30%

7.6

Number of reviews

Based on ratings from across the web.
▲Better than 81%
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Where to buy
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Best rankings
Available: ranking among products currently available (including other versions of this product).All: ranking among all products in the database.
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Technical Specifications of pair of headphones Sennheiser HD 660s2

Technical score
Technical score
5.0/ 10
✕
What it is
An assessment of technical performance for products in the Headphones category across these key areas: Sound, Calls & Controls, Connectivity, Features, Battery, Design.
When it matters
When you want to compare headphones based on technical performance and available features.
Score distribution
▼
<55-66-77-88-99-10
▼ Worse than 92% of models
Score components:

52%

5.5

Sound

20%

4.0

Features

10%

6.4

Design

8%

4.0

Connectivity

6%

4.0

Battery

4%

3.8

Calls & Controls

5.0
User score
User score
8.4/ 10
✕
What it is
A rating that combines user reviews and the total number of reviews received by the headphones.
When it matters
When you want to understand how headphones perform in real listening and how reliable they are in terms of comfort, audio quality, battery life, and long-term use.
Score distribution
▼
<55-66-77-88-99-10
▲ Better than 81% of models
Score components

70%

8.8

User ratings

30%

7.6

Number of reviews

Based on ratings from across the web.
8.4
Popularity
Popularity
7.6/ 10
✕
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.
Score distribution
▼
<55-66-77-88-99-10
▲ Better than 71% of models
Popularity:
Sennheiser HD 660s2 has a popularity score of 7.6 points, which is higher than that of 71.3% of products in this category.
7.6
Value for money
Value for money
6.5/ 10
✕
What it is
An indicator that combines the headphones' overall rating with their cost.
When it matters
When you are looking for headphones that offer a strong balance of performance, features, and price.
Score distribution
▼
<55-66-77-88-99-10
▼ Worse than 91% of models
Score components:

70%

5.7

Overall score

30%

8.5

Price

6.5
Active noise cancellation (ANC)
no
This pair of headphones does not support active noise cancellation. 27.5% of headphones support active noise cancellation.
Driver type
dynamic
Driver size
38 mm
Market range: <10 mm – >50 mm
This pair of headphones uses a driver size of 38 mm, smaller driver size than 71.5% of headphones and equal to 1% of headphones.
Number of drivers
1
Market range: <1 – >4
This pair of headphones uses 1 drivers, fewer drivers than 4% of headphones and equal to 96% of headphones.
Lowest frequency
8 Hz
Market range: <5 Hz – >20 Hz
This pair of headphones reaches a lowest frequency of 8 Hz, lower lowest frequency than 80.3% of headphones and equal to 2.8% of headphones.
Show more
Noise-canceling microphone
no
This pair of headphones does not support a noise-canceling microphone. 39% of headphones support noise-canceling microphones.
Can be used as a headset
no
This pair of headphones is not headset-ready, while 15.1% is. 84.9% of headphones can be used as headsets.
Number of microphones
0
Market range: <0 – >4
This pair of headphones has 0 microphones, fewer microphones than 73.2% of headphones and equal to 26.9% of headphones.
Boom microphone
no
This pair of headphones does not include a boom microphone. 13.5% of headphones have a boom microphone.
Microphone SNR
N/A
Show more
Connectivity
wired
This pair of headphones supports wired connectivity, less flexible connectivity than 49.2% of headphones and equal to 50.8% of headphones.
Bluetooth version
N/A
Maximum Bluetooth range
N/A
Audio latency
N/A
Multipoint support
no
This pair of headphones does not support multipoint. 30.6% of headphones support multipoint.
Show more
Ambient sound mode
no
This pair of headphones does not offer ambient sound mode. 24.9% of headphones support ambient sound mode.
EQ support
no
This pair of headphones does not support EQ customization. 23.2% of headphones support EQ.
Companion app
no
This pair of headphones does not work with a companion app. 21.6% of headphones support companion apps.
Adjustable ANC levels
N/A
Voice assistant support
no
This pair of headphones does not support voice assistants. 60.9% of headphones support voice assistants.
Show more
Battery life
N/A
Battery life with ANC
N/A
Charging time
N/A
Quick charge
no
This pair of headphones does not support quick charging. 33.1% of headphones support quick charge.
Battery capacity
N/A
Show more
Brand name
Sennheiser
Form factor
over-ear
Weight
260 g
Market range: <14 g – >340 g
This pair of headphones weighs 260 g, heavier than 65.6% of headphones and equal to 2.2% of headphones.
Acoustic design
open-back
Clamp force
6
Market range: <2.5 – >6.1
This pair of headphones has a clamp force of 6, higher clamp force than 88.7% of headphones and equal to 1.2% of headphones.
Show more

Sennheiser HD 660s2 vs the average pair of headphones

246810TotalDesignSoundBatteryConnectivityCalls & ControlsFeatures
  • Spatial audio support
    This pair of headphones supports spatial audio, the average pair of headphones does not. 15.9% of headphones support spatial audio.
  • 10 Hz lower bass extension
    This pair of headphones has a lower lowest frequency than the average pair of headphones (8 Hz vs 18 Hz). The average headphones reach a lowest frequency of 18 Hz.
    8 Hz vs 18 Hz
  • 21,500 Hz higher treble extension
    This pair of headphones has a higher highest frequency than the average pair of headphones (41,500 Hz vs 20,000 Hz). The average headphones reach a highest frequency of 20,000 Hz.
    41,500 Hz vs 20,000 Hz
  • 0.26 % lower distortion
    This pair of headphones has a lower total harmonic distortion than the average pair of headphones (0 % vs 0.3 %). The average headphones have total harmonic distortion of 0.3 %.
    0.04 % vs 0.3 %
  • 10 mm more spacious earcup height
    This pair of headphones offers more spacious earcup height than the average pair of headphones (70 mm vs 60 mm). The average headphones offer an inner earcup height of 60 mm.
    70 mm vs 60 mm
  • Open-back design
    This pair of headphones uses an open-back design, while the average pair of headphones does not. 9.1% of headphones have an open-back design.
  • 0.6 m longer cable length
    This pair of headphones offers a more useful cable length than the average pair of headphones (1.8 m vs 1.2 m). The average headphones have a cable length of 1.2 m.
    1.8 m vs 1.2 m
  • 7 newer release date
    This pair of headphones was released more recently than the average pair of headphones (2023 vs 2016). The average headphones were released in 2016.
    February 2023
    2023 vs 2016
  • 5.5% higher user score
    User score
    8.4/ 10
    ✕
    What it is
    A rating that combines user reviews and the total number of reviews received by the headphones.
    When it matters
    When you want to understand how headphones perform in real listening and how reliable they are in terms of comfort, audio quality, battery life, and long-term use.
    Score distribution
    ▼
    ▼
    <55-66-77-88-99-10
    Sennheiser HD 660s2
    the average pair of headphones
    Sennheiser HD 660s2 has a higher user score than the average pair of headphones (8.44 vs 8).
    8.44 vs 8
  • 10 mm more spacious earcup height
    This pair of headphones offers more spacious earcup height than the average pair of headphones (70 mm vs 60 mm). The average headphones offer an inner earcup height of 60 mm.
    70 mm vs 60 mm
  • Open-back design
    This pair of headphones uses an open-back design, while the average pair of headphones does not. 9.1% of headphones have an open-back design.
  • 0.6 m longer cable length
    This pair of headphones offers a more useful cable length than the average pair of headphones (1.8 m vs 1.2 m). The average headphones have a cable length of 1.2 m.
    1.8 m vs 1.2 m
  • Spatial audio support
    This pair of headphones supports spatial audio, the average pair of headphones does not. 15.9% of headphones support spatial audio.
  • 10 Hz lower bass extension
    This pair of headphones has a lower lowest frequency than the average pair of headphones (8 Hz vs 18 Hz). The average headphones reach a lowest frequency of 18 Hz.
    8 Hz vs 18 Hz
  • 21,500 Hz higher treble extension
    This pair of headphones has a higher highest frequency than the average pair of headphones (41,500 Hz vs 20,000 Hz). The average headphones reach a highest frequency of 20,000 Hz.
    41,500 Hz vs 20,000 Hz
  • 0.26 % lower distortion
    This pair of headphones has a lower total harmonic distortion than the average pair of headphones (0 % vs 0.3 %). The average headphones have total harmonic distortion of 0.3 %.
    0.04 % vs 0.3 %
  • 7 newer release date
    This pair of headphones was released more recently than the average pair of headphones (2023 vs 2016). The average headphones were released in 2016.
    February 2023
    2023 vs 2016
  • No passive noise reduction
    This pair of headphones does not offer passive noise reduction, while the average pair of headphones does. 82.6% of headphones have passive noise reduction.
  • No voice assistant support
    This pair of headphones does not support voice assistants, the average pair of headphones does. 60.8% of headphones support voice assistants.
  • 2 mm smaller driver size
    This pair of headphones has smaller driver size than the average pair of headphones (38 mm vs 40 mm). The average headphones use a driver size of 40 mm.
    38 mm vs 40 mm
  • Not headset-ready
    This pair of headphones is not headset-ready, while the average pair of headphones is. 84.8% of headphones can be used as headsets.
  • 19.3% higher weight
    This pair of headphones is heavier than the average pair of headphones (260 g vs 218 g). The average pair of headphones weighs 218 g.
    260 g vs 218 g
  • 1.7 higher clamp force
    This pair of headphones has a higher clamp force than the average pair of headphones (6 vs 4.3). The average headphones have a clamp force of 4.3.
    6 vs 4.3
  • No battery indicator
    This pair of headphones does not show battery level clearly, while the average pair of headphones does. 56.3% of headphones have a battery level indicator.
  • 4.33x more expensive
    Sennheiser HD 660s2 is more expensive than the average pair of headphones (£390 vs £90).
    £390 vs £90
  • 4.33x more expensive
    Sennheiser HD 660s2 is more expensive than the average pair of headphones (£390 vs £90).
    £390 vs £90
  • 11.3% worse value for money
    Sennheiser HD 660s2 has worse value for money than the average pair of headphones (6.53 vs 7.3).
    6.53 vs 7.27
  • 19.3% higher weight
    This pair of headphones is heavier than the average pair of headphones (260 g vs 218 g). The average pair of headphones weighs 218 g.
    260 g vs 218 g
  • 1.7 higher clamp force
    This pair of headphones has a higher clamp force than the average pair of headphones (6 vs 4.3). The average headphones have a clamp force of 4.3.
    6 vs 4.3
  • 9 mm tighter earcup width
    This pair of headphones has tighter earcup width than the average pair of headphones (35 mm vs 44 mm). The average headphones offer an inner earcup width of 44 mm.
    35 mm vs 44 mm
  • No passive noise reduction
    This pair of headphones does not offer passive noise reduction, while the average pair of headphones does. 82.6% of headphones have passive noise reduction.
  • 2 mm smaller driver size
    This pair of headphones has smaller driver size than the average pair of headphones (38 mm vs 40 mm). The average headphones use a driver size of 40 mm.
    38 mm vs 40 mm
  • 2 dB/mW lower sensitivity
    This pair of headphones has a lower sensitivity than the average pair of headphones (100 dB/mW vs 102 dB/mW). The average headphones have sensitivity of 102 dB/mW.
    100 dB/mW vs 102 dB/mW
  • No battery indicator
    This pair of headphones does not show battery level clearly, while the average pair of headphones does. 56.3% of headphones have a battery level indicator.
  • Not headset-ready
    This pair of headphones is not headset-ready, while the average pair of headphones is. 84.8% of headphones can be used as headsets.
  • 1 fewer microphones
    This pair of headphones has fewer microphones than the average pair of headphones (0 vs 1). The average headphones have 1 microphones.
    0 vs 1
  • No voice assistant support
    This pair of headphones does not support voice assistants, the average pair of headphones does. 60.8% of headphones support voice assistants.

Video reviews

Hands-on testing, unboxing, and real-world video evaluations

9.0
vypermajik
≈ estimated
20/11/2024
Long-term test · about one month of daily use
Verdict
Sennheiser HD 660S2 is pricey and open-back, but it has excellent sound and a sturdy build that should last, making it a top mid-tier pick.
8.0
Master Marslander
≈ estimated
03/11/2023
Hands-on review · sound tests, tube amp use and price
Verdict
Sennheiser HD 660S2 is a worthy flagship successor that sounds great on tube amps, but it is overpriced at full retail.
9.5
Mad Audio
≈ estimated
14/09/2023
Long-term test · two months of use against rivals
Verdict
Sennheiser HD 660S2 is probably the best dynamic headphone at its price, especially for clear, natural listening.
4.0
SoundStage! Network
≈ estimated
09/09/2023
Second opinion · listening tests and value comparison
Verdict
Sennheiser HD 660S2 is balanced and laid-back, but at this price it offers no clear advantages and other headphones give better value.
9.0
the Honest Audiophile
≈ estimated
05/09/2023
Hands-on review · sound, comparison with 660S and HD 600
Verdict
Sennheiser HD 660S2 is a neutral, reference-style headphone and is highly recommended for studio and general listening.
9.0
Skeeb23
≈ estimated
18/06/2023
Hands-on review · sound tests, comfort and tube amp pairing
Verdict
Sennheiser HD 660S2 feels clampy at first but gets comfortable with time, and its neutral sound is excellent across many genres.
8.0
Amplify Audio Reviews
≈ estimated
29/04/2023
Hands-on review · sound tests and comparison with other models
Verdict
Sennheiser HD 660S2 has a solid build and warm, deep sound, but it is not a clear upgrade over the classic 6XX and 650 models.
8.0
Gadget Generations
≈ estimated
16/04/2023
Two-week review · vocals, build and comparison
Verdict
Sennheiser HD 660S2 is well built with excellent vocals, though the soundstage is limited and the price is high.
5.0
Reviews By WaveTheory
≈ estimated
28/03/2023
Full review · sound tests, comparisons and pricing
Verdict
Sennheiser HD 660S2 has an enjoyable midrange, but at its price it fails to stand out from the competition and is hard to recommend.
6.0
Joshua Valour
≈ estimated
21/02/2023
Hands-on review · sound and comparison with earlier models
Verdict
Sennheiser HD 660S2 is a good headphone, but it is not a big jump over the 600 series, and cheaper models may suit better.
6.0
DMS
≈ estimated
19/02/2023
Hands-on review · measurements and comparison with the 650 and 600
Verdict
Sennheiser HD 660S2 is neither bad nor a must-buy; it suits some listeners, while the classic 650 remains the favourite.
9.0
Soundnews
≈ estimated
08/02/2023
Hands-on review · measurements and listening tests
Verdict
Sennheiser HD 660S2 sounds warmer and more technical than its predecessors, with better bass; the design barely changed and the slight price increase is justified.

Expert reviews

In-depth analysis and verdict from leading tech publications

expertreviews.co.uk
15/03/2023
Listening review · Open-back hi-fi
Verdict
The Sennheiser HD 660S2 is a big, detailed open-back for solo home listening with a wide stage, but rolled-off treble and a need for a good DAC hold it back.
H
headfonia.com
08/05/2023
Summary of the review
Sennheiser HD 660S2 Review
whathifi.com
28/05/2023
Expert review · Open-back hi-fi
Verdict
The Sennheiser HD 660S2 is a relaxed, smooth listen with a standout midrange, but its soft bass lacks tautness and punch.
soundguys.com
30/06/2023
Hands-on test · Open-back headphones
Verdict
The Sennheiser HD 660S2 is a comfortable, neutral open-back pair for quiet home listening, but its price is hard to justify over the cheaper HD 600 or HD 660S.
headfonics.com
23/09/2023
Hands-on review · Open-back headphones
Verdict
The Sennheiser HD 660S2 is a clear step up from the HD 660S, with deeper sub-bass and a 300 ohm rating that suits tube amplifiers.
headphonesty.com
06/11/2023
Hands-on review · Reference-tuned headphones
Verdict
The Sennheiser HD 660S2 is a mostly neutral, well-built open-back pair with excellent bass and imaging, suited to mixing, though vocals are less forward than the HD 600.
R
rtings.com
08/03/2023
Summary of the review
Sennheiser HD 660S2 Headphones Review - RTINGS.com
techradar.com
24/03/2023
Hands-on review · Wired open-back headphones
Verdict
The Sennheiser HD 660S2 is a relaxed, neutral open-back pair that suits home listening and mixing, but leaks sound and needs an amp for best results.
senses.se
24/09/2024
Comparison review · Open-back headphones
Verdict
The Sennheiser HD 660S2 has excellent midrange and a wide stage, but its thin bass and treble make it hard to justify over the cheaper HD 600.
hifi.de
08/02/2023
Hands-on test · Open-back headphones
Verdict
The Sennheiser HD 660S2 is a worthy successor with punchier bass and fine detail, best for home listening with a headphone amp.
kopfhoerer.de
21/02/2023
Hands-on test · Audiophile open headphones
Verdict
The Sennheiser HD 660S2 is a detailed, balanced open-back with deeper bass than its predecessor, suited to demanding home listeners and studio work.
bonedo.de
13/06/2023
Hands-on test · Home and studio use
Verdict
The Sennheiser HD 660S2 is a top-tier home and studio headphone with outstanding bass and fit, but its plain plastic look and open design rule out mobile use.
lowbeats.de
09/11/2023
Hands-on test · Open-back hi-fi
Verdict
The Sennheiser HD 660S2 is a deeper-bass, detailed open-back update that keeps the 600 series' neutral tone, suiting home listeners who want tight low end.
kopfbox.de
18/02/2023
Comparison test · Open-back hi-fi
Verdict
The Sennheiser HD 660S2 is a punchier successor to the HD 660S, with sharper drum transients, but its thinner packaging and shorter cables feel like cost cuts.
modernhifi.de
23/04/2024
Listening test · Warm open-back
Verdict
The Sennheiser HD 660S2 is a warm, detailed open-back with excellent vocals, best for quiet home listening; its treble lacks sparkle and it has no hard case.
likehifi.de
14/03/2023
Listening test · Open-back hi-fi
Verdict
The Sennheiser HD 660S2 is a detailed, spacious open-back with deep bass for quiet home listening, but the open design and need for a strong amp make travel use unsuitable.
fr.audiofanzine.com
04/10/2023
Lab test · Open-back hi-fi
Verdict
The Sennheiser HD 660S2 excels at linear, precise mids and a wide stereo image, but lacks deep sub-bass and does not justify its high price.
on-mag.fr
06/03/2023
Hands-on review · Open-back hi-fi
Verdict
The Sennheiser HD 660S2 is the most mature model in its series, with balanced sound and clear instrument separation, but the plastic build and firm clamp suit small heads best.
H
homecinema-fr.com
05/05/2023
Summary of the review
Sennheiser HD 660S2 Review
(Translated)Show original
G
galaxus.fr
10/08/2023
Summary of the review
Sennheiser HD 660S2: sounds great
(Translated)Show original

Third-party reviews

Based on ratings from across the web.
Reviews last updated: November 2026 · How we calculate this

What customers like about Sennheiser HD 660s2

  • Significantly improved sub-bass extension and low-end punch compared to previous models
  • Natural and warm midrange performance that excels with vocals and acoustic instruments
  • Non-fatiguing, smooth treble that remains detailed without being sharp or piercing
  • Lightweight design with soft velour earpads suitable for long listening sessions
  • Durable, modular build quality with a classic aesthetic and high-quality cables
  • Excellent imaging and spatial accuracy, which also makes them effective for gaming

What customers don't like about Sennheiser HD 660s2

  • High MSRP that many users find difficult to justify compared to older HD 600-series models
  • Strong initial clamping force that can be uncomfortable before a 'break-in' period
  • Open-back design results in high sound leakage and zero noise isolation
  • Requires a dedicated headphone amplifier (300-ohm impedance) to achieve optimal performance
  • Average soundstage width that can feel 'intimate' or slightly narrow for an open-back
  • Packaging is simpler than previous iterations, lacking a premium hard storage case

Verdict

The Sennheiser HD 660S2 is a high-end, open-back dynamic headphone featuring a 38mm transducer with an improved 300-ohm impedance and a frequency response of 8 Hz to 41.5 kHz. Key characteristics include a lightweight 260g design, plush velour ear pads, and a revised airflow system that lowers the resonant frequency to 70 Hz for enhanced sub-bass extension. Main pros include its natural, non-fatiguing sound signature, exceptional midrange clarity, and superior low-end impact compared to its predecessors. However, notable cons include its high initial clamping force, the requirement for a dedicated amplifier to reach its full potential due to the high impedance, and significant sound leakage inherent to its open-back design.

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