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The Sennheiser HD 660S2 are open-back audiophile headphones that are the next version of the Sennheiser HD 660 S. Even though they look and feel the same as their predecessors, the company that made them has changed the way they sound to make it have more bass, punch, and warmth.
Their treble range has also been shaped, which may or may not be a good thing based on whether you liked the more balanced sound of other Sennheiser headphones like the HD 650. Also, their resistance has gone from 150 ohms to 300 ohms, and their sensitivity has gone up to 104 dB/SPL, so you’ll need a strong amplifier to drive them well.
Sennheiser HD 660S2 Specifications
| Specification | Details |
|---|---|
| Model | Sennheiser HD 660S2 |
| Headphone Type | Over-ear |
| Driver Type | Dynamic |
| Impedance | 150 ohms |
| Frequency Response | 10Hz – 41kHz |
| Open-back Design | Yes |
| Connector | 6.35mm (1/4″) stereo jack |
| Cable Length | 3 meters |
Sennheiser HD 660S2: Design
Even though nothing has changed on the outside, the 660S2 has some new parts inside. The 660S2 has a new voice coil made of ultra-light metal. This is meant to make the driver lighter. A new airflow system has also been put in place to reduce warping and get rid of artifacts that get in the way. Both the resistance and the sensitivity of this driver have changed because of these changes. The 660S2 is now a 300 Ohm headphone, which means it needs a specialized headphone amplifier with a lot of power. You can buy this headphone from its official website
Sennheiser HD 660S2: Connection
You will receive a headphone cable with a balanced 4.4mm jack measuring 5.8 feet in length, a headphone cable with an unbalanced 1/4-inch jack measuring 5.8 feet in length, and an adapter that converts 1/4-inch to 3.5mm. Because Sennheiser headphones use proprietary connectors, it is not possible to replace either the cable or the headphones with a cable manufactured by another company. Because there is no gratifying click that occurs when the cables are properly connected to the headphone, it is important to exercise caution when inserting the cords into the earcups of the headphones.
Sennheiser HD 660S2: Sound Quality
Almost never will you see a smooth, straight line if you look at the frequency response of the dynamic driver or any other dynamic driver. Instead, you will see a curve that may change by up to ten decibels in the middle listening range. From this, we can see that, other than the choice of materials, it all comes down to how well the maker can build and tune.
Sennheiser did a great job, because the sound of the HD 660S2 is open, airy, and very clear. The balance of the frequency response stays the same, and the sound as a whole is scientific without being cold. Also, the HD 600S2 works well even at high volumes, with little distortion.
Final Words
The balanced sound of the Sennheiser HD 660S2 is very good. They have a soft sound, and even though they are open-back, they have more bass than their predecessor. Because their mids are so neutral, singing and instruments also sound natural and clear. A dip in the low-treble makes these sounds less clear and detailed, while a peak in the mid-treble right after makes sibilants sound more violent and piercing. Even though their field feels big and open, it’s hard to hear things outside of your head, and you’ll need an amp to power these over-ear headphones. On the plus side, they keep their bass and highs even after being reseated.
Sennheiser HD 660S2 review: The good and The bad
The Good
- Consistent, neutral sound
- Various cable options
The Bad
- Lack of smart features
FAQS
When it comes to ANC, the Bose QuietComfort 45 (cyan) is better than the Sennheiser MOMENTUM 4 Wireless (pink). Both headphones do a great job of canceling out noise, but the Bose QuietComfort 45 does a better job in almost every area, especially with low and midrange frequencies.
Many other brands offer better value in the budget and mid-range areas, but the Sennheisers are competitive at the top end.