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

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Though the S2’s may clamp, I actually don’t notice any hinge creaking that the HD660S’s had which is great, so that’s a definite improvement. The Sennheiser HD600 has done this for me for half a decade now, and the HD660S2 is challenging for the oval crown. The review sample was loaned by the local Sennheiser distributor for writing a review for "hxosplus" printed edition. So when a drummer separates two cymbals and taps the top of a cymbal the first thing I hear is the tap, the next thing I hear is the top cymbal dancing on the edges of the lower cymbal and it just constantly creates air.

HD 660S2 | Sennheiser HD 660S2 | Sennheiser

The ear pads are made with the same velour outer material as with the whole HD6xx series and they are comfortable but don't have enough room to house the whole ear while they get quite warm after a while.The timbre is very realistic, the music gets emotionally connected with the listener who is rewarded with an engaging, organic and realistic listening experience. The Sennheiser HD-660S2 headphones are the latest in Sennheiser’s series of open-backed models, offering a premium audio experience, comfortable fit and general sense of superiority over regular commercial cans. Another thing of note is that the new driver can handle louder listening levels better than the HD660S because of the very low distortion.

Sennheiser HD 660S2 Review — Headfonics

And Sennheiser, acting as a skilful and inspired composer, has managed to create a little gem variation that, in my opinion, has managed to surpass the original theme. Again, I am sounding like a broken record, but someone really took the effort to make the S2 better than S in every way and keep the lineage/strengths of 600 and 650. The improved bass response over the HD-660s means that lows are brilliantly and accurately realized – if you’re used to regular commercial cans, you should hear details you’ve never noticed before. Just for giggles I ran a frequency sweep from 20hz to 20khz and apparently I can still hear up to 19khz and feel 21khz. The HD650 is more sweet sounding and rounded with some extra lushness and elasticity to the mid range compared to the more aggressive and enthusiastic HD660S2.

It is not that you can't listen to classical music but the instruments sound slightly out of tune and emphasized compared to, the already slightly colored, 660S2 which comparatively is more in-tune sounding. If your source devices can’t make the most of these high-impedance headphones, then the 300 Ohms count on these headphones aren’t fully utilized. Leaving no doubt as to this being a set of cans aimed squarely at audiophiles, the new version feature a300 ohmimpedance rating, meaning they’ll need more drive from a hi-fi device than the previous 660 S, which had a lower 150 ohm rating. When listening to the famous male alto Philippe Jaroussky with the HD660S2 and the HD650 you will find out that his voice sounds more natural and realistic with the latter than the former and additionally the listener feels like actually sitting and listening to the performance instead of hugging the singer.

Sennheiser HD 660S2 Review - Headfonia Reviews Sennheiser HD 660S2 Review - Headfonia Reviews

The bass on the 109 PRO will just slightly bleed into the mids but it can't be said that it is overlapping the rest of the frequencies or clouding the mid-range. We first took a look at the original Sennheiser HD650 all the way back in 2008, and were blown away by theirnatural tonalityand comfort. 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. This is where the lower mids of the HD660S2’s come in, because the clear and lower and upper mids create such a stark contrast for higher and lower octaves that it plays well for vocals. There was no obligation for an international review but I have decided to share my impressions with the community.

Most testing was done through Spotify, where I broadly keep my music catalog, though I also used the HD-660S2 to listen to podcasts and YouTube/Twitch videos, to cover a variety of sources. I do reviews for me first due the creative intellectual masturbatory pleasure I get out of the process, and I want to get what is hopefully beneficial information out to others. In your opinion, is the HD660s2 worth it as a headphone for use in movies, series and female vocals?