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CrimsonFeather4345 14.1K Views
Jan 9, 2023 2:49 PM

Sennheiser HD 660 S Open-Back Audiophile Headphones (Refurb)

$250

$500

50% off
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Deal Details
Sennheiser.com has Sennheiser HD 660 S Open-Back Audiophile Headphones (Refurbished) for $249.95. Shipping is free.

Thanks to community member CrimsonFeather4345 for finding this deal.

Features:
  • Open-back dynamic reference headphones
  • All-new 42 mm transducer and 38 mm diaphragm
  • Aluminum voice coils for effortless detail and engaging dynamics
  • Ventilated driver reduces turbulence for clarity across the entire frequency range
  • Special damping element made from fine acoustic metal mesh
  • Includes detachable Ā¼-inch (6.3mm) single-ended and 4.4mm balanced cables
  • Lightweight, timeless design and comfortable velour pads for hours of fatigue-free listening
  • Acoustic components manufactured and assembled to tightest tolerances for optimized performance
  • Impedance: 150 ohms
  • Frequency response: 9 ā€“ 41,500 Hz
  • Total harmonic distortion: <0.04%

Editor's Notes

Written by persian_mafia | Staff
  • About this item:
    • Refurbished products are offered with ļ»æ30 days free returns, as well as our standard 2-year manufacturer warranty.
  • About this deal:
  • Reviews:

Original Post

Written by CrimsonFeather4345
Community Notes
About the Poster
Deal Details
Community Notes
About the Poster
Sennheiser.com has Sennheiser HD 660 S Open-Back Audiophile Headphones (Refurbished) for $249.95. Shipping is free.

Thanks to community member CrimsonFeather4345 for finding this deal.

Features:
  • Open-back dynamic reference headphones
  • All-new 42 mm transducer and 38 mm diaphragm
  • Aluminum voice coils for effortless detail and engaging dynamics
  • Ventilated driver reduces turbulence for clarity across the entire frequency range
  • Special damping element made from fine acoustic metal mesh
  • Includes detachable Ā¼-inch (6.3mm) single-ended and 4.4mm balanced cables
  • Lightweight, timeless design and comfortable velour pads for hours of fatigue-free listening
  • Acoustic components manufactured and assembled to tightest tolerances for optimized performance
  • Impedance: 150 ohms
  • Frequency response: 9 ā€“ 41,500 Hz
  • Total harmonic distortion: <0.04%

Editor's Notes

Written by persian_mafia | Staff
  • About this item:
    • Refurbished products are offered with ļ»æ30 days free returns, as well as our standard 2-year manufacturer warranty.
  • About this deal:
  • Reviews:

Original Post

Written by CrimsonFeather4345

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Top Comments

nytehawk
610Comments
118Reputation
Don't go car shopping alone if you have difficulty telling the difference between a 2 series and a 6 series.
Go to Comment
CrimsonFeather4345
883Comments
224Reputation
Lots of opinions about these 660S versus 6xx from Drop and 560S. Here's a fact that may or may not be important to you...the 660S has 150 Ohm impedance, the others have 300 Ohm impedance. In theory, the 660S will sound good without an amp, i.e. direct from phone or computer in a pinch, or in the unlikely case you don't have a headphone amp.
Please
Go to Comment
Leifish
83Comments
26Reputation
HD 560S is 120 ohm.
Go to Comment

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33 Comments

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Original Poster
Jan 9, 2023 3:34 PM
883 Comments
Joined Jul 2018
CrimsonFeather4345
Original Poster
Jan 9, 2023 3:34 PM
883 Comments
Lots of opinions about these 660S versus 6xx from Drop and 560S. Here's a fact that may or may not be important to you...the 660S has 150 Ohm impedance, the others have 300 Ohm impedance. In theory, the 660S will sound good without an amp, i.e. direct from phone or computer in a pinch, or in the unlikely case you don't have a headphone amp.
Please
Last edited by CrimsonFeather4345 January 9, 2023 at 07:41 AM.
2
Jan 9, 2023 5:27 PM
83 Comments
Joined Oct 2010
LeifishJan 9, 2023 5:27 PM
83 Comments

Our community has rated this post as helpful. If you agree, why not thank

Quote from CrimsonFeather4345 View quoted comment :
Lots of opinions about these 660S versus 6xx from Drop and 560S. Here's a fact that may or may not be important to you...the 660S has 150 Ohm impedance, the others have 300 Ohm impedance. In theory, the 660S will sound good without an amp, i.e. direct from phone or computer in a pinch, or in the unlikely case you don't have a headphone amp.
Please
HD 560S is 120 ohm.
1
Original Poster
Jan 9, 2023 5:46 PM
883 Comments
Joined Jul 2018
CrimsonFeather4345
Original Poster
Jan 9, 2023 5:46 PM
883 Comments
Quote from Leifish View quoted comment :
HD 560S is 120 ohm.
You're right I'm sure. Sorry, and thanks for the correction.
Jan 9, 2023 6:08 PM
31 Comments
Joined Aug 2014
mpicarelliJan 9, 2023 6:08 PM
31 Comments
awesome deal! Love these headphones
Jan 9, 2023 6:26 PM
4.1K Comments
Joined Oct 2015
goodness97Jan 9, 2023 6:26 PM
4.1K Comments
The refurbished was $225 in the past.
3
Jan 10, 2023 5:26 AM
342 Comments
Joined Nov 2014
justinmega1Jan 10, 2023 5:26 AM
342 Comments
Do they at least replace the ear pads?
1
Jan 10, 2023 12:37 PM
886 Comments
Joined Mar 2009

This comment has been rated as unhelpful by Slickdeals users.

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Jan 10, 2023 1:36 PM
610 Comments
Joined Nov 2013
nytehawkJan 10, 2023 1:36 PM
610 Comments
Quote from VladStar View quoted comment :
I miss those days when wired Sennheisers were like $20 at newegg, with fairly good sound quality, but paying $250 for the refurb?
Don't go car shopping alone if you have difficulty telling the difference between a 2 series and a 6 series.
4
Jan 10, 2023 3:04 PM
713 Comments
Joined Nov 2006
d3a1zJan 10, 2023 3:04 PM
713 Comments
Quote from VladStar View quoted comment :
I miss those days when wired Sennheisers were like $20 at newegg, with fairly good sound quality, but paying $250 for the refurb?
If you want cheap and good try the Koss KPH40. Probably the most bang for the buck headphone out there. I have the 660s and really like them. I have seen some folks say they have no bass which I don't think is true. They are by no means bass head levels, but if driven right it is appropriately there. I have never heard any open backs that really slam. I like them better than my 650's. For reference, I use a Woo WA7 since I am sure I will get the 650 underpowered and needs tubes comment. 660s are just more lively to me.
Last edited by d3a1z January 10, 2023 at 07:07 AM.
Jan 10, 2023 4:28 PM
728 Comments
Joined Jun 2017
CharleyWJan 10, 2023 4:28 PM
728 Comments
No bass, like none at all! Sundara's we're also going for 250 refurb not too long ago, make sure to look into that if you don't know about them! Not saying what's better but definitely check the word out about them

https://www.rtings.com/headphones...shold=0.15

I am not saying one is better than the other! just making sure people know about other options....

https://youtu.be/azrIm2y7JXA

Also r t i n g s scoring does not directly represent the quality of the product, headphones have unique sound signatures for a reason and should not be judged by a flatline signature
Last edited by CharleyW January 10, 2023 at 08:43 AM.
Jan 10, 2023 4:30 PM
2.7K Comments
Joined Dec 2019
User18383921Jan 10, 2023 4:30 PM
2.7K Comments
Quote from justinmega1 View quoted comment :
Do they at least replace the ear pads?
Earpads are $60 a pop and recommended YOU replace them every 6months-1year depending on use.

Aftermarket earpads alter the sound too much

Welcome to the audiophile world

Some earpads cost $400.
1
Jan 10, 2023 4:34 PM
2.7K Comments
Joined Dec 2019
User18383921Jan 10, 2023 4:34 PM
2.7K Comments
Quote from VladStar View quoted comment :
I miss those days when wired Sennheisers were like $20 at newegg, with fairly good sound quality, but paying $250 for the refurb?
These are top of the line Sennheisers. I wish they were $20
1
1
Jan 10, 2023 4:50 PM
2.7K Comments
Joined Jan 2010
evilaJan 10, 2023 4:50 PM
2.7K Comments
Quote from nytehawk View quoted comment :
Don't go car shopping alone if you have difficulty telling the difference between a 2 series and a 6 series.
What does car shopping have to do with this?
3
Jan 10, 2023 5:09 PM
7.8K Comments
Joined Oct 2008
RumbleTheBisonJan 10, 2023 5:09 PM
7.8K Comments
Quote from evila View quoted comment :
What does car shopping have to do with this?
Yea it's a bad diss, but nonetheless the person they replied to may have been very misinformed regarding this product.
1

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Jan 10, 2023 5:15 PM
1.1K Comments
Joined Oct 2016
KRT09Jan 10, 2023 5:15 PM
1.1K Comments
Efficiency (aka SPL) also matters when considering if a headphone needs an amp or not but I rarely see people in these threads bring that up. (Higher efficiency = easier to power). Sennheiser headphones are almost all high efficiency so the high impedance isn't as big of an obstacle as some make it sound. I still recommend some extra (amp) power for the 6XX, probably the 660S but borderline, and the 560S is the easiest to drive by a long shot because it has the lowest impedance and very high efficiency (110db). There are many excellent affordable ChiFi dongles that will be superior to 99% of mobo or phone audio though so a decent amp isn't hard or expensive to come by.

All good headphones, it just depends on what sound signature you're looking for. If you want to play competitive games I would recommend the 560S over the others simply because the 6X0 headphones have very little soundstage and weird directional imaging. For music listening in this price range I recommend the Sundara over any of these but those are also not ideal for gaming and they definitely need an amp.

I think it's hard to really go wrong with any of these headphones unless you really hate the sound signature.

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