Over-Ear Headphones · owner-verdict comparison

Sennheiser HD 660S2 vs Sonos Ace Ultra: what real owners say

Real owners rate these about evenly: 61% of 231 Sennheiser HD 660S2 owners recommend it, vs 56% of 18 for the Sonos Ace Ultra.

Verdicts aggregated from Reddit, enthusiast forums, and YouTube owner comments — affiliate reviews excluded. Sample sizes differ; judge accordingly. How we score

Sennheiser HD 660S2

61%of 231 owners recommend
61% recommend · 20% neutral · 19% don't
Owners praise
  • Lush, natural mids and vocals with classic Sennheiser timbre
  • Deeper, richer bass with much better sub-bass extension than the older 6x0
  • Excellent imaging and soundstage for gaming and movies
Owners complain about
  • Dark, veiled or muffled-sounding presentation
  • Loses the forward midrange magic of the cheaper 600/650
Full owner report →

Sonos Ace Ultra

56%of 18 owners recommend
56% recommend · 22% neutral · 22% don't
Owners praise
  • Clear sound upgrade over the original Ace, especially in the bass
  • Pulling TV audio from a Sonos soundbar to the headphones works well for some owners
  • Comfortable fit
Owners complain about
  • The TV audio link to a Sonos soundbar drops out, picks up static, or fails to connect for a few owners, and one returned a pair over it
  • A few owners still rate rivals higher, such as the AirPods Max 2 overall or Bowers & Wilkins headphones for music
Full owner report →

Which should you buy?

Get the Sennheiser HD 660S2 if
  • ✓HD6x0 owners wanting more bass extension and treble sparkle
  • ✓All-day listeners who want a warm, fatigue-free sound
  • ✓Gaming, movie, and music all-rounder seekers
  • ✓Metal, rock, and EDM fans wanting fuller low end
Skip it if
  • Those wanting a wide, expansive soundstage over intimate presentation
  • Purists chasing the classic 600/650 midrange, which feels recessed
Get the Sonos Ace Ultra if
  • ✓Sonos soundbar owners who want to watch TV on headphones
  • ✓Original Ace owners who want more bass
Skip it if
  • Buyers counting on the soundbar link to work without dropouts from day one

What Sennheiser HD 660S2 owners say

“I've had it for 5 years now and I still consider it the best of the 600 series”
— @o.f.ftrack3444 on YouTube
“They are my go-to primary headphones.”
— @scottlowell493 on YouTube
“At $250-$350 I would consider giving these a go at $600 they are a pass.”
— @mindhead1 on YouTube

What Sonos Ace Ultra owners say

“I think these sound leagues above the original Ace tho thanks to that custom dual-ring magnet motor. The bass is deep and tactile while the sound stage is far more wide and open in comparison to its predecessor.”
— @ventus77777-h on YouTube
“I have the Ace Ultra and i love them....especially with my Sonos Theatre system...i had the first ones and i like these ones more....no complaints whatsoever”
— @SpankyGolfaddict65 on YouTube
“do NOT buy these for TV audio swap. the feature sucks. source: i own these headphones.”
— @Beanz0911 on YouTube

Sennheiser HD 660S2 vs Sonos Ace Ultra: frequently asked questions

Is the Sennheiser HD 660S2 or the Sonos Ace Ultra better?

Real owners rate these about evenly: 61% of 231 Sennheiser HD 660S2 owners recommend it, vs 56% of 18 for the Sonos Ace Ultra.

Who should get the Sennheiser HD 660S2?

Owners point the Sennheiser HD 660S2 at hD6x0 owners wanting more bass extension and treble sparkle, and all-day listeners who want a warm, fatigue-free sound.

Who should get the Sonos Ace Ultra?

Owners point the Sonos Ace Ultra at sonos soundbar owners who want to watch TV on headphones, and original Ace owners who want more bass.

What do owners complain about?

The most-cited downside of the Sennheiser HD 660S2 is dark, veiled or muffled-sounding presentation. For the Sonos Ace Ultra, it's the TV audio link to a Sonos soundbar drops out, picks up static, or fails to connect for a few owners, and one returned a pair over it.