Sennheiser HD 660S2
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Product details
The new HD 660S2 sounds wonderfully familiar: With playfully effortless precision, it finds an almost intimate closeness to every piece of music and every instrument. Its significantly enhanced bass takes this experience even deeper. The warm, engaging fundamental tone is complemented by an extended deep bass. Listening suddenly becomes an experience that enriches, astonishes, and remains unique. Navigating this depth cleanly is an art in itself. The Sennheiser team has doubled the sound pressure of the lowest frequencies while maintaining exceptional precision and balance in the deep and mid-bass range. This is not only impressive physically but acoustically as well: The extended bass range changes everything. Suddenly, there is more space, more depth across the entire spectrum. Against this deeper backdrop, highs become more brilliant, the stage deeper, and emotions stronger. And when the music session lasts a bit longer with this new depth dimension, the headphones, thanks to their comfortable design, never become a burden. Thus, the HD 660S2 combines the best from multiple worlds into a sound experience that both heart and ear will not want to miss.
Audiophile sound – warm, engaging fundamental tone complemented by extended deep bass – outstanding impulse response thanks to an ultra-light aluminum voice coil with 300 ohm impedance – 38 mm high-performance transducers, built in Ireland – new ventilated magnet system for more power and crystal-clear sound – finely resolved sound with great timbre and rich, precise deep bass.
Exceptionally comfortable – soft velour ear pads and open design for high wearing comfort – the feather-light construction and ergonomically designed headband go unnoticed on any head shape – a worldwide 2-year warranty promises peace of mind.
| Application range | General |
| Equipment + Functions | Removable cable |
| Headphone type | Over ear headphones |
| Signal transmission | Cable |
| Audio Connections | Jack 3.5mm (1x), Jack 4.4mm (1x), Jack 6.3mm (1x) |
| Noise cancelling | No noise cancelling |
| Isolation | Open |
| Item number | 35540337 |
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30-day right of return if unusedReturn policy
Reviews & Ratings
Statutory warranty score
How often does a product of this brand in the «Headphones» category have a defect within the first 24 months?
Source: Galaxus- 83.Aiaiai5,3 %
- 83.SBS5,3 %
- 83.Sennheiser5,3 %
- 86.B&O5,4 %
- 86.Technics5,4 %
Statutory warranty case duration
How many working days on average does it take to process a warranty claim from when it arrives at the service centre until it’s back with the customer?
Source: Galaxus- 68.LG8 days
- 70.AKG11 days
- 71.Sennheiser12 days
- 72.Aiaiai13 days
- 72.Suunto13 days
Return rate
How often is a product of this brand in the «Headphones» category returned?
Source: Galaxus- 73.RØDE4,1 %
- 74.Technics4,2 %
- 75.Sennheiser4,3 %
- 76.Shure4,5 %
- 76.Soundpeats4,5 %
Not every pair of Bluetooth headphones is suitable for everyone. Some sound great, others sit better in the ear when jogging. Some models shine with super-long battery life, others as a headset in the home office. You can find your personal test winner with the help of our database...
- Processing
- Sound
- Cable connections on the headphones
With the HD 660S2, Sennheiser has not only succeeded in creating a good successor to the first HD 660, but also a worthy heir to the legendary HD 600. With its balanced, precise sound and high-quality housing, the headphones are convincing across the board. So if you are looking for high-end headphones for a wide range of applications, the HD 660S2 is a strong candidate.
- Particularly natural, responsive sound
- High resolution over the entire frequency band
- Significantly lighter than the competition
With its HD series, Sennheiser has held a special position in the not-so-small headphone market for 30 years. The HD660S2 continues this tradition in an impressive way.
- Significant gain in the bass range compared to the predecessor
- Clear and clean resolution without ever seeming cold
- Two cables and adapter to small jack in scope of delivery
- 100 euros more expensive than predecessor
- Sits a little tight
With the HD 660S2, Sennheiser has succeeded in creating a worthy successor to an already outstanding pair of hi-fi headphones. In terms of sound, the new 660s grab you and your music tighter and captivate you with their crisper low frequency range. But it never overdoes it, always sounding harmonious and offering one 'aha' moment after another at the upper end of the frequency spectrum...
- excellently balanced sound
- abysmal bass
- somewhat high contact pressure
These headphones speak one language above all: sound! Everything about them is geared towards the optimal reproduction of music. Every detail becomes "visible", every playing error is ruthlessly revealed. Add to this the enormous joy of playing, which always brings a smile to my face when I feed the listener jazz, funk or fusion. Bad mood? No chance!
Sennheiser pays well for the small sound improvements of the HD 660S2. The recommended retail price rises from 500 to 600 euros. Sennheiser justifies this with the more expensive transducers and the higher reject rate due to stricter quality controls. The old HD 660S, which is now being sold at the street price of 400 euros, is to disappear from the portfolio in future...