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forum thread Posted by Eragorn | Staff • Jan 21, 2025
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forum thread Posted by Eragorn | Staff • Jan 21, 2025

Sennheiser HD 660S2 Wired Open-Back Headphones (Certified Refurbished) $299.95 + Free Shipping

$300

$600

50% off
10 Comments 7,458 Views
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Sennheiser-Hearing [sennheiser-hearing.com] has Sennheiser HD 660S2 Wired Open-Back Headphones (Certified Refurbished) for $299.95. Shipping is free.

What's included:
  • HD 660S2 headphones
  • 6.3 mm cable (1.8 m), 4.4 mm cable (1.8 m)
  • 6.3mm to 3.5mm adapter
  • Carry pouch
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Deal Details
Community Notes
About the Poster
Sennheiser-Hearing [sennheiser-hearing.com] has Sennheiser HD 660S2 Wired Open-Back Headphones (Certified Refurbished) for $299.95. Shipping is free.

What's included:
  • HD 660S2 headphones
  • 6.3 mm cable (1.8 m), 4.4 mm cable (1.8 m)
  • 6.3mm to 3.5mm adapter
  • Carry pouch

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10 Comments

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Jan 21, 2025
292 Posts
Joined Feb 2018
Jan 21, 2025
UpbeatSquirrel1768
Jan 21, 2025
292 Posts
I have listened to these, and they are a departure from the HD 600 and 650 with their "neutral" sound. The mids feel a bit muffled compared to the older, cheaper 600 series headphones. The build quality is excellent, and they are just as comfortable as their predecessors.

Even at full retail I would recommend the HD 600 for netural, or the HD 650/6XX for a little more bass before the 660s2. For reference, I have utilized the HD600 or HD6XX as my daily driver for 5+ years.
Jan 22, 2025
2,063 Posts
Joined Jun 2016
Jan 22, 2025
phrodini
Jan 22, 2025
2,063 Posts
Quote from UpbeatSquirrel1768 :
I have listened to these, and they are a departure from the HD 600 and 650 with their "neutral" sound. The mids feel a bit muffled compared to the older, cheaper 600 series headphones. The build quality is excellent, and they are just as comfortable as their predecessors.

Even at full retail I would recommend the HD 600 for netural, or the HD 650/6XX for a little more bass before the 660s2. For reference, I have utilized the HD600 or HD6XX as my daily driver for 5+ years.
which did you like more, 600 or 6xx?
Jan 22, 2025
292 Posts
Joined Feb 2018
Jan 22, 2025
UpbeatSquirrel1768
Jan 22, 2025
292 Posts
Quote from phrodini :
which did you like more, 600 or 6xx?
I still rock my marble HD600 as they are a bit more "true neutral." The HD6XX/650 have a bass bump that most people will enjoy though.
Jan 22, 2025
2,063 Posts
Joined Jun 2016
Jan 22, 2025
phrodini
Jan 22, 2025
2,063 Posts
Quote from UpbeatSquirrel1768 :
I still rock my marble HD600 as they are a bit more "true neutral." The HD6XX/650 have a bass bump that most people will enjoy though.
thanks for the feedback. I do enjoy a bit a both, if the neutral pair can somehow benefit from bass boost from an ifi dac then i might be set
Jan 23, 2025
760 Posts
Joined Apr 2009
Jan 23, 2025
tsa1
Jan 23, 2025
760 Posts
Quote from UpbeatSquirrel1768 :
I have listened to these, and they are a departure from the HD 600 and 650 with their "neutral" sound. The mids feel a bit muffled compared to the older, cheaper 600 series headphones. The build quality is excellent, and they are just as comfortable as their predecessors.

Even at full retail I would recommend the HD 600 for netural, or the HD 650/6XX for a little more bass before the 660s2. For reference, I have utilized the HD600 or HD6XX as my daily driver for 5+ years.
These appear to be much more relaxed in the treble as well. I'm seeing comments by users that reviewers left out, that the imaging and bass quality/tactility is better than on the other 600 series headphones.
Jan 23, 2025
292 Posts
Joined Feb 2018
Jan 23, 2025
UpbeatSquirrel1768
Jan 23, 2025
292 Posts
Quote from tsa1 :
These appear to be much more relaxed in the treble as well. I'm seeing comments by users that reviewers left out, that the imaging and bass quality/tactility is better than on the other 600 series headphones.
I think the major issue at this price point, is that you have "better" options (AKG K702, Hifiman Sundara) unless you specifically want the Sennheiser design/fit. Another thing to keep in mind for those cranially blessed folks, the HD6x0 headphones are quite a tight fit until broken in. If you plan on stretching them over a box or something, remove the earpads first as they will flatten quickly under the pressure.
Jan 26, 2025
528 Posts
Joined Oct 2008
Jan 26, 2025
speedwheels
Jan 26, 2025
528 Posts
For less money the HE400se ( drop x4) measure better, look at the measurements on Audio science Review

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Jan 26, 2025
1,443 Posts
Joined Oct 2008
Jan 26, 2025
FatFreddysCat
Jan 26, 2025
1,443 Posts
Same price at Amazon (and still sold by Sennheiser).

https://www.amazon.com/SENNHEISER...B0BYTNMHG3
Jan 26, 2025
1,725 Posts
Joined Dec 2013
Jan 26, 2025
JeffJ9000
Jan 26, 2025
1,725 Posts
Quote from speedwheels :
For less money the HE400se ( drop x4) measure better, look at the measurements on Audio science Review
Measurements don't matter nearly as much as my ears. Or yours.
Jan 27, 2025
2,063 Posts
Joined Jun 2016
Jan 27, 2025
phrodini
Jan 27, 2025
2,063 Posts
Quote from speedwheels :
For less money the HE400se ( drop x4) measure better, look at the measurements on Audio science Review
A lot of people dislike those headphones,even at the lower price.

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