Customer reviews from Sennheiser
Sennheiser - Refurbished Excellent - HD 660S2 Wired Over-the-Ear Headphones - Black
Average customer rating
4.7
(19 Reviews)
Rating breakdown 19 reviews
5 Stars
15
4 Stars
3
3 Stars
0
2 Stars
1
1 Star
0
78%of customers recommend this product.
(
7 out of
9)
Customer Reviews for Sennheiser - Refurbished Excellent - HD 660S2 Wired Over-the-Ear Headphones - Black
Customer Rating
4
Good, not great
on January 23, 2026
Posted by: jmc
from NC
Gender:Female
The bass is lacking. I really feel like something is missing.
No, I would not recommend this to a friend.
Written by a customer while visiting Sennheiser
Customer Rating
5
Good Headphones
on December 28, 2025
Posted by: Sky123
I love the headphones, they had amazing clarity and range, there was nothing wrong with the audio.
Written by a customer while visiting Sennheiser
Customer Rating
5
AntSlappy’s HD 660S2 mods
on July 8, 2025
Posted by: AntSlappy
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!!!
Written by a customer while visiting Sennheiser
Customer Rating
5
Incredible sound!!
on June 20, 2025
Posted by: SonicFlash
from Houston, Texas
Gender:Male
I absolutely love these headphones. Paired with the right DAC and Amp they make magic happen!!!
I would recommend this to a friend!
Written by a customer while visiting Sennheiser
Customer Rating
5
Supreme Quality
on May 5, 2025
Posted by: jwestbrook
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...
Written by a customer while visiting Sennheiser
Customer Rating
5
Way better than expected
on April 7, 2025
Posted by: DHL
from Pismo Beach CA
Gender:Male
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.
I would recommend this to a friend!
Written by a customer while visiting Sennheiser
Customer Rating
5
desert island headphones indeed
on March 6, 2025
Posted by: Ernest_loves_moon
from NJ
Gender:Male
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
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
I would recommend this to a friend!
Written by a customer while visiting Sennheiser
Customer Rating
5
Sennheiser knows what they are doing, Bravo!
on February 11, 2025
Posted by: DrewDog5031
from Minneapolis, MN
Gender:Male
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
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
I would recommend this to a friend!
Written by a customer while visiting Sennheiser