Customer reviews from Sennheiser
Sennheiser - Refurbished Excellent - HD 660S2 Wired Over-the-Ear Headphones - Black
Average customer rating
4.7
(18 Reviews)
Rating breakdown 18 reviews
5 Stars
15
4 Stars
2
3 Stars
0
2 Stars
1
1 Star
0
88%of customers recommend this product.
(
7 out of
8)
Customer Reviews for Sennheiser - Refurbished Excellent - HD 660S2 Wired Over-the-Ear Headphones - Black
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
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
really good
on April 19, 2023
Posted by: Chris
from Martinsville, New Jersey, United States
amazing sound quality + comfortable ear-pads. Love that my ears can finally breathe during extended wear periods. my only complaint is they fit slightly too snug, and perhaps too little padding on the top band. Overall, very satisfied. Thanks
Written by a customer while visiting Sennheiser
Customer Rating
5
Extra low end makes it sound more balance
on February 26, 2023
Posted by: Gerardo
from Huntsville, Alabama, United States
I have the 660S1 and they are great but always felt they lacked a bit on the low end. Now the S2 the low end is present, clear and not moody. By adding more low end bass they make the highs sound a bit warmer in comparison to the S1 but not in a bad way. Overall they sound balance from highs to low frequencies
Written by a customer while visiting Sennheiser
Customer Rating
4
Break in is not an option
on September 23, 2024
Posted by: Avi8tr
from Washington
Pushing them with a McIntosh 7200 and honestly my first hour was pure buyer’s remorse. After 10 hours not so muffled but hoping for more clarity especially in the treble range. Bass is not the problem. So hopefully more time may help but we’ll see. You’ll need an extension if you’re going to be couch lounging. What’s with the useless black bag? Really?
I would recommend this to a friend!
Written by a customer while visiting Sennheiser
Customer Rating
5
Novice+ Audiophile Experience
on December 13, 2024
Posted by: RK66
from Baltimore, MD
Gender:Male
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.
It was a great investment that I had on my radar for a few years.
I would recommend this to a friend!
Written by a customer while visiting Sennheiser
Customer Rating
5
Awesome Buy
on December 17, 2024
Posted by: WalkerB
Bought this as an early Christmas gift for myself and was not disappointed by it one bit. Definitely worth the buy.
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