Sennheiser HD 660S2 Wired Audiophile Stereo Headphones with Deep Sub Bass, Optimized Surround, Transducer Airflow, Vented Magnet System and Voice Coil – Black

Product Information

Outside the Sennheiser ecosystem, the HD660S2 is an undeniably excellent sounding headphone with supreme technicalities and a balanced, realistic tuning that offers plenty of musicality and emotional involvement and as such it directly compares with similar or slightly more expensive headphones like the HiFiMan Ananda Stealth or the Meze 109 PRO. Enjoy your music on a completely new level. An intimate, relaxed sound signature combines with outstanding precision and exceptional comfort — and now, extended sub bass — for a deeply moving experience.

Sennheiser HD 660S2 Review - Major HiFi Sennheiser HD 660S2 Review - Major HiFi

The 660S2 has slightly better technicalities, it is a bit more tight, layered, better defined and controlled but also more drier and not as full bodied and visceral as the 109 PRO. Still the HD660S fairs better than the rest of the family with the more spacious and airy soundstage that is slightly wider and more open while it places the listener in a more realistic and proportional distance from the performers. One notable difference between the two is the soundstage which is more extended and open sounding in the 109 PRO with extra spaciousness and air around the instruments while it places the lis As the big focus of this review is on the comparison with the other Sennheiser headphones and the amplifier synergy, we’ll keep this part to the point. Testing was done with a series of amplifiers, using the Musician Audio Aquarius and EarMen ST-AMP as DAC, streaming music from Tidal via ROON on my laptop. For the direct comparisons I used the Cayin Audio HA-3A tube headphone amplifier, as it has an impedance selector, and it allows to connect 2 headphones in balanced mode at the same time. All testing was done in balanced mode, unless specified otherwise.Starting with gaming.​ Opening up discord and immediately being greeted by a few dudes in a VOIP channel, the first thing I noticed was the HD660S2 being absolutely clear for speech. This is great, because in this game I play on a daily basis called Squad, I always take up the role of a Squad Leader. The Squad Leader is essentially a volunteer managerial position where I need to listen to 2-4 voices through my right ear, speak with fellow squad leaders with my left ear, and have a 3rd party application like Discord taking up my center channel. So, how do you follow up a bonafide classic? There is no easy answer to that question. Sennheiser has been hard at work, trying to capture lightning in a bottle one more time. The headphone scales very well and will highlight higher quality electronics but up to a certain point as it cannot eventually compete with really high end headphones, like the Meze Elite and HiFiMan Susvara, in scaling potential. Additionally the texture is weighty and rounded, not as dry and thin as the HD660S while it decays in a more relaxed way helping instruments to sound full bodied and realistic in their reverberation in time and space.

Sennheiser HD-660S2 review: easy on the ears at home – but

Let’s get into tonality starting with treble. The HD660S2’s bring out a smooth and realistic presentation. I can’t say for sure but they could be on the same volume as the Sundaras regarding treble, but they peak in the absolute perfect place in comparison. Sundara’s treble is somewhat grating for me and peaks in the weirdest places that seem to alter speech. Listening to that guy on AfterPrisonShow with the Sundaras is a real problem, I can’t stand listening to him with the Sundaras as the lower treble peak on the headphones emphasize the way he pronounces “S” sounds through his molars. I’ve sold the Sundaras a long time ago and my goodness just typing about that headphone brings me grief again. The 660S2’s treble regarding speech on S pronunciations are smooth in comparison, there is no grain and sibilance.Let me reiterate, that I have no skin in the game. I do this for the cognitive brain orgasm I get out of analyzing what I enjoy. This is a joy to write, and I hope informative for the listener. Male voices are closer on S2. The tonality/naturalness of male voices on 600 and S2 are both excellent. I like the timbre on both. The S2 notes are a tiny bit more rounded than the 600. I would attribute this to the wider stage of the S2. May have to go for the Fiio as I can buy Fiio here in Norway,plenty to think about? once again many thanks for your time

Sennheiser HD 660S2 – Thomann UK Sennheiser HD 660S2 – Thomann UK

Despite the usual sneer directed at plastic for not having a “premium” enough feel in hand, the HD 6xx series of headphones tend to last for a long time. My HD 650, for example, have been going strong for over seven years. The familiar design of the 6XX series re-appears on the HD 660S2.

The earpads are the same ones that come with the other HD 6xx series of headphones, which means that the sound signature will become more mid-centric as the pads wear over time. The foam padding has been improved, aiding in comfort. This is a tuning with plenty of bass and mid-bass that favors the fun and enjoyment factor rather than actual tonal accuracy. On a technical level, the HD660 S2 also scores well. The smoother tonality doesn’t stand in the way of the precision, extension , and overall detail retrieval. As expected from Sennheiser, the dynamics are excellent as well. Also impressive is the left-right balance and stereo imaging, it’s a joy to the ears. You get a perfect mix of body, cleanness , and precision and that combined with the smooth and dynamic delivery makes it a very musical high-end headphone.