HD 660S 2 - Wired Audiophile Stereo Headphones with Deep Sub Bass, Optimized Surround, Transducer Airflow, Vented Magnet System and Voice Coil
Product details
Web ID: 15883557AntSlappy’s HD 660S2 mods
I pulled out the black foam in the middle/inside of each “can” and got a WAY BETTER CABLE and WAY BETTER EAR PADS!!! Now these sound/perform WAY BETTER THAN STOCK!!!
Customer review from Sennheiser
Incredible sound!!
I absolutely love these headphones. Paired with the right DAC and Amp they make magic happen!!!
Recommends this product
Customer review from Sennheiser
Supreme Quality
I am very happy with this purchase. Supremely comfortable to wear, very nice/quality engineering produces a high fidelity sound experience... I particularly appreciate Sennheiser following up with the sound samples via email, whereby I received a 'guided tour' of the capabilities built into these headphones... Supreme quality - excellent sound reproduction - no regrets, would buy again...
Customer review from Sennheiser
Way better than expected
I bought the 660S2 HP expecting mid level performance in this day and age of 3K to 6K top of the line HP. Was very surprised when I A/B'd this set with Hifiman Susvaras. Bass response was very good; attack and decay was better in the Sennheisers vs the Susvara. The Sennheisers were considerably warmer sounding than the Susvara, but in a musical way, not muddy or smearing. The Susvara has a bit more "air" and inner detail, but not 6K worth. I did not experience a broad sound field with either HP. Subtle detail like the bells in John Klemmers Touch were a bit more evident in the Susvara but still very much present in the 660s. Driving the Sennheisers was considerably easier than the Susvaras as has been noted elsewhere, but cabling is less critical with the more sensitive Sennheiser's higher 300 ohm impedance; wire gage makes less of a difference if you have longer wire runs as opposed to the low sensitivity 60 ohm Susvara. I found I had to crank my class A HP amp up full volume with the Susvara leaving little headroom. The Sennheisers were easily driven with that amp with plenty of headroom. I generally I was very surprised at how good the Sennhesiers are, and they are probably 80 to 90% of the performance of the Hifiman product, some may find them overall better.
Recommends this product
Customer review from Sennheiser
desert island headphones indeed
incredible feel pure sound I can hear all the different parts to the music comfy lackluster packaging - but I bought headphones, I don’t care about how they’re stored
Recommends this product
Customer review from Sennheiser
Sennheiser knows what they are doing, Bravo!
Solid construction. you can feel the quality. Don't let the plastic deter you from buying these. The clamping force is a little much, but I have a large head. I used my headphone holder, with a couple of folded cloths, to widen the clamping and it now fits perfect. You can wear these all day with no ear fatigue or head pain. The sound is amazing. The sub bass is present without being muddy. I EQ with my HD600 but the 660S2 does not need it. They pair will with my Schiit Valhalla 2 tube amp. Not only is this an upgrade to the HD600 (for me), but the 660S2 stands on its own as a great, open-back headphone
Recommends this product
Customer review from Sennheiser
Awesome Buy
Bought this as an early Christmas gift for myself and was not disappointed by it one bit. Definitely worth the buy.
Customer review from Sennheiser
Novice+ Audiophile Experience
I just purchased my HD660S2 on Black Friday, upgrading from Sennheiser PXC 550 II. I'm a lifetime music lover that just in recent years got interested in hires lossless music. The 660s2 along with Questyle M15i DAC using 4.4mm balanced output is a tremendous sound quality difference with Qobuz music. I can hear a lot of little nuances in the music that wasn't noticeable previously. It was a great investment that I had on my radar for a few years.
Recommends this product
Customer review from Sennheiser