439 €599 € Discount against the manufacturer's recommended price, not a previous price of this shop.How we work this outread at 16:02 UTC on 1 Nov
Deliveryabout 1–2 days
Returns14-day free returns
Sennheiser HD 660S2
Their type or too few of their facts are known yet, so they are not in our ranking.
439 €599 € Discount against the manufacturer's recommended price, not a previous price of this shop.How we work this out
Before you buy, compare it with 2 recommended alternatives
Beside them, two models on sale today that come closest on score and price, of the same type where we have them.
Green is the best of these 3, also when they share the lead.
| This model Sennheiser HD 660S2 | Higher score, 40% cheaper JBL Tour One M3 Best on 2 facts | Higher score, 16% cheaper Sony WH-1000XM6 | |
|---|---|---|---|
| Most important facts | |||
| The lowest price today at a shop that delivers to you, delivery included. A price with an asterisk comes from a shop abroad, and its delivery cost is our own estimate. Lowest price | 439 €Amazon.de | 261 €EURONICS best | 369 €Amazon.de |
| Our own score out of 10: 60% the maker’s facts and 40% shop ratings. Price does not count. Score | not in our ranking | ||
| The average of the stars buyers give at the shops, with the number of reviews behind it. We only compare it from 20 reviews. Customer rating | – | ★ 4.5 · 33 reviews best | ★ 4.3 · 92 reviews |
| How the headphones cancel outside noise with microphones. Hybrid uses microphones outside and inside the cup, adaptive also adjusts to the sound around you. When it matters
When it matters less
Source
| – | Adaptive | Adaptive |
| How long the headphones or the earbuds play on one charge with noise cancelling on, as the maker states it. In this comparisonWhen it matters
When it matters less
Source
| – | 40 h | 30 h |
| What the headphones or one earbud weigh. Lighter is more comfortable for hours at a time. In this comparisonWhen it matters
When it matters less
Source
| 260 g | 278 g | 254 g |
| The Bluetooth version. A newer one connects more steadily and uses less power, if the phone has it too. In this comparisonSource
| – | 5.3 | 5.3 |
| How the sound is packed for Bluetooth. AAC suits iPhones, aptX and LDAC carry more detail from Android phones that support them. When it matters
When it matters less
Source
| – | SBC, AAC, LDAC, LC3 | SBC, AAC, LDAC, LC3 |
| Connected to two devices at once, such as a phone and a laptop, and switching by itself to the one that plays. When it matters
When it matters less
Source
| – | yes | yes |
Facts as the maker states them. A dash means the maker does not name it. Each model’s page gives the source of every fact. Noise is the maker’s own figure, so we do not judge it, and a customer rating only counts from 20 reviews.
Prices per shop
On 1 November 2026 the lowest price for the Sennheiser HD 660S2 is 439 € at Amazon.de, delivery to Germany included.
All prices include VAT and delivery to Germany. We may earn a commission when you buy through these links. It never changes our ranking.
Price history
Lowest price per day
Follow price changes via RSS. A feed reader (RSS app) shows a new entry at every change, with no e-mail address needed.
Lowest since 1 Nov439 €
Highest since 1 Nov439 €
Price drops since 1 Nov0no drop seen yet
Sennheiser HD 660S2 specifications
The numbers that matter first, then every fact by group. As published by the maker or the shop we read it from.
Build and fit 6 facts
- Form factor
Source: eu.sennheiser-hearing.com · checked on 1 Nov
How the headphones sit: over the ear, on the ear, in the ear canal, in the outer ear, beside the ear or on the cheekbone.
- Over-ear
- True wireless
96 of the 184 models we track have this.
Source: derived, no source of its own · checked on 1 Nov
Two separate earbuds with no wire between them, charged in a case.
- no
- Wireless
153 of the 184 models we track have this.
Source: derived, no source of its own · checked on 1 Nov
They play over Bluetooth, without a cable to the phone.
- no
- Acoustic design
Source: eu.sennheiser-hearing.com · checked on 1 Nov
Whether the ear cups are closed or open at the back. Closed keeps sound in and out, open sounds more spacious but lets everyone around you hear.
- Open-back
- Ear pad material
When it matters
- Long listening sessions or a warm room, where leather gets sweaty.
- Commuting, where a closer seal keeps more noise out.
When it matters less
- Earbuds, which have tips instead of pads.
Source: eu.sennheiser-hearing.com · checked on 1 Nov
What the cushions against your ears are made of. Leather and protein leather seal well but get warm, velour and fabric breathe but let more sound in.
- Velour
- Weight
Among the models we track
260 g on this model
Lowest
3.1 g Highest
451 g Middle
8.6 gHigher than 122 of the 168 models we track.
When it matters
- Wearing them for hours at a desk or on a flight.
- Running or the gym, where a heavy earbud works loose.
When it matters less
- Short listens, where comfort hardly has time to matter.
Source: eu.sennheiser-hearing.com · checked on 1 Nov
What the headphones or one earbud weigh. Lighter is more comfortable for hours at a time.
- 260 g
Sound 3 facts
- Lowest frequency
Among the models we track
8 Hz on this model
Lowest
4 Hz Highest
50 Hz Middle
20 HzLower than 79 of the 104 models we track.
Source: eu.sennheiser-hearing.com · checked on 1 Nov
The lowest tone the maker says they play. It says little about how the bass actually sounds.
- 8 Hz
- Highest frequency
Among the models we track
41,500 Hz on this model
Lowest
16,000 Hz Highest
80,000 Hz Middle
29,000 HzHigher than 99 of the 104 models we track.
Source: eu.sennheiser-hearing.com · checked on 1 Nov
The highest tone the maker says they play. Adult hearing stops well below most figures.
- 41,500 Hz
- Impedance
Among the models we track
300 Ω on this model
Lowest
15 Ω Highest
520 Ω Middle
32 ΩHigher than 70 of the 75 models we track.
Source: eu.sennheiser-hearing.com · checked on 1 Nov
The electrical resistance. Wired headphones with a high impedance need an amplifier to play loud enough.
- 300 Ω
Sources: eu.sennheiser-hearing.com
The maker
Sennheiser
- Headquarters: Germany
- Founded in 1945
- Owned by Sonova AG, Switzerland
Sennheiser was founded by Fritz Sennheiser in 1945 near Hanover in Germany. Its headphones are sold by Sonova Consumer Hearing GmbH in Hanover, because the consumer business is run by Sonova AG under licence from Sennheiser. Sonova has its group headquarters in Stäfa, Switzerland. The range includes the MOMENTUM 4 Wireless and the HD 600.
