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HiFiMAN Sundara vs Sennheiser HD 660S2

Reddit prefers Sennheiser HD 660S2 — higher sentiment (89% vs 57% positive).

#2 in Headphones

HiFiMAN

HiFiMAN Sundara

57

Pros

  • +Great for instrumental music
  • +Violin hits different
  • +Great for eq
  • +Excellent value (refurbished)

Cons

  • −Replaced in the mindshare by many other headphones
  • −Too relaxed tuning for gaming
  • −Sounds flatter in game
  • −Gunshots lack punch in game
“There's no way the Sundara has been recommended so much it's top 5 in 2026. It's so hard to believe that just because it's been replaced in the mindshare by so many other headphones for years now.”
Full review
#1 in HeadphonesReddit favorite

Sennheiser

Sennheiser HD 660S2

89

Pros

  • +Drivers handle lower midrange and bass well (with eq/amp)
  • +Dream headphones
  • +Demands tube wonders
  • +Sound quality

Cons

  • −Bright sound signature
  • −Not flat
  • −Bass is not as good as he1kse
  • −Expensive on used market (when in poor condition)
“I enjoy listening to stringed instruments with the HD 600, especially acoustic and bowed.”
Full review

Specifications

SpecHiFiMAN SundaraSennheiser HD 660S2
Driver80mm Planar Magnetic42mm
Frequency Response6Hz–75kHz8Hz–41.5kHz
Impedance37Ω300Ω
TypeOpen-backOpen-back
Weight372g260g
Connectivity3.5mm (with 6.35mm adapter)6.35mm + 4.4mm balanced
Driver TypePlanar Magnetic—
Noise Cancelling—No
Price——
Reddit sentiment57%89%
Mentions79
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