80
What Hi-Fi?Specialist
“Will Sennheiser’s latest audiophile headphones become a cult classic?”
Publisher score: 4/5
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Open comparison
AudiophileOpen-backDiscount only
Sennheiser HD 660S2
$599 · Dynamic Driver · 3y 5m old
78
Review
Radar
8.8
User score
Image credit: Official product image
Spec sheet
Key features
We only show details we can tie to a product-specific source.
Build and fit
- Weight
- 260 g
- Wearing style
- Open-back, over-ear wired headphones
- THD
- <0.04% (1 kHz, 100 dB)
- Impedance
- 300 ohm
- Driver size
- 38 mm
- Driver type
- Dynamic, open
- Sensitivity
- 104 dB (1 kHz, 1 Vrms)
- Frequency response
- 8 - 41,500 Hz
Wireless and connections
- Connections
- Wired, 6.3 mm jack plug, 4.4 mm balanced plug, 6.3 mm to 3.5 mm adapter, 1.8 m cables
Review evidence
Audio specialist reviews
63
“We take a look at the Sennheiser HD 660S2, and it definitely isn't for everyone. But is it the set for you?”
Publisher score: 6.3/10
Review evidence
Tech publication reviews
87
HeadfonicsRead review ↗
“Today, we review the Sennheiser HD 660S2, which is a second-generation set of circumaural open-back 300Ω 42mm dynamic driver headphones.”
Publisher score: 8.7/10
80
TechHiveRead review ↗
“Sennheiser's new open-back, audiophile-quality over-ear headphones deliver an awesomely open sound stage and are decided not neutral tuning.”
Publisher score: 4/5
80
Digital TrendsRead review ↗
“When you want to really explore the detail and depth of your favorite tracks, choose the Sennheiser HD 660S2.”
Publisher score: 8/10
80
TechRadar
“Open-back Sennheiser headphones that are gentle on the ears”
Publisher score: 4/5
80
Pocket-lintRead review ↗
“These excellent audiophile headphones might not be a huge upgrade, but they sound exquisite.”
Publisher score: 8/10
Best for
critical listeninghome desksdetail seekers
Buying notes
Value todaySale only
The review score is harder to justify at the current price. 78/100 at $680. Uses the lowest in-stock retailer price we can see.
Worth checking
How well it scales with different amplifier output impedances.
Score distribution
90–100
0
80–89
6
70–79
0
60–69
1
0–59
0
Quick stats
Highest87
Median80
Lowest63
Reviews7
Your take
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