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HomeHeadphonesSennheiserSennheiser HD 660S2
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Global opinion
Sennheiser

Sennheiser HD 660S2

Over-ear • 38mm

No reviews yet

The Kacbu Global score is the average of user ratings; it will appear here once this product has collected enough ratings.

Over-earHeadphone type
38mmDriver size
FROM AROUND THE WORLD
Be the first to share an opinion on this product.Have you used this product? Share your experience — help users all over the world make a better decision.
KACBU

Should I buy it?

Sennheiser HD 660S2
CONSIDER
  • No real owner data yet — the verdict stays cautious
Great choice if these matter:
  • Long listening in a quiet room
  • Use with a headphone amplifier
  • Anyone running a balanced connection
Watch out for:
  • 300 ohm impedance asks for a headphone amplifier
  • An open design does not isolate you from the room
Regret riskLOWlimited data
Main risks
  • 300 ohm impedance asks for a headphone amplifier
  • An open design does not isolate you from the room
  • The specification page states no ear pad material
The risk level is computed from the release date, verified weaknesses and real owner reports. The confidence score only appears once real owner data exists.
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This box relies only on verified specs, the release date and real owner reports. We do not predict prices.
Global OpinionKacbu ScoreWhat the World SaysAudioConnectivityWearingLaunchSpecificationsFAQQ&AWrite a ReviewAlternatives
Kacbu Global Opinion

What does the world think about this product?

Instead of compressing opinions from different countries into a single score, we show overall satisfaction alongside country-by-country trends.

No reviews yet for this product. Be the one to write the first — the country breakdown starts forming with the first reviews.

Kacbu Score

How many stars are users giving?

The rating distribution will be published here once enough reviews come in.

This product hasn't been rated yet.

What the World Says

User reviews from around the world

Real reviews, written in the author's own language.

No reviews yet — be the first to write one.

Audio

What is there on the audio side?

Manufacturer's official technical values.

AUDIO

On a headphone, the driver and the circuit driving it are what you are buying.

38mm

38mm — Driver size · Open, dynamic — Driver type · 8 - 41500 Hz — Frequency response · 300 ohm — Impedance · 104 dB (1 kHz, 1 Vrms) — Sensitivity

38mmOpen, dynamic8 - 41500 Hz300 ohm104 dB (1 kHz, 1 Vrms)
38mmDriver size
Open, dynamicDriver type
8 - 41500 HzFrequency response
300 ohmImpedance
104 dB (1 kHz, 1 Vrms)Sensitivity
Connectivity

How does it connect?

Manufacturer's official technical values.

CONNECTIVITY

On a wireless headphone, the codec says more than the range does.

—

6.3 mm jack plug, 4.4 mm balanced plug — Plug type

6.3 mm jack plug, 4.4 mm balanced plug
6.3 mm jack plug, 4.4 mm balanced plugPlug type
Wearing

How is it worn?

Manufacturer's official technical values.

WEARING

On something worn for hours, weight is a question of comfort.

260 g

260 g — Weight · Circumaural — Wearing style · 1.8m — Cable length

260 gCircumaural1.8m
260 gWeight
CircumauralWearing style
1.8mCable length
Who Is It For?

Where does it stand out?

A quick usage guide built from the product's specs and the editorial summary.

Long listening in a quiet room

Great fit
Use with a headphone amplifier

Great fit
Anyone running a balanced connection

Great fit
Editorial Analysis

Strengths and points to consider

Compiled by the Kacbu editorial team from spec sheets, independent press reviews and reported user feedback.

Strengths based on the specs
38mm open, dynamic driver
8 - 41500 Hz frequency range
Total harmonic distortion <0.04% (1 kHz, 100 dB)
6.3 mm jack plug and 4.4 mm balanced plug
6.3 mm → 3.5 mm adapter included
Things to consider
300 ohm impedance asks for a headphone amplifier
An open design does not isolate you from the room
The specification page states no ear pad material
Historical Product Info

Official launch details

Instead of tracking today's retail price, Kacbu keeps the product's official launch information as a reference.

Design🇩🇪 Germany

Sennheiser's consumer headphones are sold by Sonova Consumer Hearing. The specification pages state no assembly country, so none is claimed here.

This is not the current retail price — it shows the product's historical, official launch information.
Specifications

Sennheiser HD 660S2 specifications

Click a linked value to see other products that share that same spec, and leave a comment on that spec.

Audio

Official source: sennheiser-hearing.com
Total harmonic distortion
<0.04% (1 kHz, 100 dB)
Impedance
300 ohm
Driver size
38mm
Driver type
Open, dynamic
Sensitivity
104 dB (1 kHz, 1 Vrms)
Frequency response
8 - 41500 Hz

Connectivity

Official source: sennheiser-hearing.com
Plug type
6.3 mm jack plug, 4.4 mm balanced plug
Included adapter
6.3 mm → 3.5 mm

Design

Official source: sennheiser-hearing.com
Weight
260 g
Cable length
1.8m
Wearing style
Circumaural

General

Official source: sennheiser-hearing.com
Series
HD
Headphone type
Over-ear
FAQ

The most common questions about this product

What the numbers on the spec sheet actually mean in day-to-day use.

Should you buy the Sennheiser HD 660S2?
The Kacbu decision box currently says CONSIDER for the Sennheiser HD 660S2: the specs hold up, but there are not yet enough real owner reports to strengthen the call. Pros, cautions and alternatives are in the decision box at the top of this page.
Q&A

What are users asking each other?

If there's something specific to your own use case, ask — people who use this product will answer.

Have a question about Sennheiser HD 660S2?Be the first to ask

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Shared Hardware

Products that share this hardware

This product's standout specs. You can jump to other models that use the same value.

Headphone typeOver-ear7 more productsDriver size38mmThis is the only product using it
Join the Community

What do you think of Sennheiser HD 660S2?

Share your experience in your own language. Kacbu connects your opinion with users across different regions of the world.

GLOBAL COMMUNITY

Your opinion could help someone on the other side of the world.

The experiences of people who actually use the product are at the heart of Kacbu. A short, honest, genuine review is enough.

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  • Write what you like and dislike most
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