r/positive
My setup is kinda similar, Sennheiser HD660S2 with a FiiO BTR15
About this product
The Sennheiser HD 660S2 is an open-back headphone model, frequently praised for its sound quality and perceived as a great value at around $179. It is known for its drivers handling lower midrange and bass effectively, especially with an amplifier or EQ.
Best for: Audiophiles seeking an endgame open-back headphone experience.
Pros
- Drivers handle lower midrange and bass well with EQ/amp
- Considered "dream headphones" by some users
- Perceived as great value for money at $179
- Overall great sound quality
Cons
- Some users find the sound signature bright
- The frequency response is not perfectly flat
- Bass performance may not match ultra-high-end models
- Can be expensive on the used market if in poor condition
Verdict
โBuy if you're seeking a high-quality open-back headphone with excellent sound and appreciate its perceived value, especially with an amp or EQ.โ
AI-generated summary based on Reddit discussions about Sennheiser HD 660S2. Last updated Apr 20, 2026.
What one Redditor said
โI've had mine for a few years as well, and I love them. It's so good that makes well made music pop a lot more... I replaced my HD6XX pads recently with these and they've been great.โ
Reddit reviews
+ 10~ 6โ 0
r/positive
I've had mine for a few years as well, and I love them. It's so good that makes well made music pop a lot more... I replaced my HD6XX pads recently with these and they've been great.
r/positive
RCA combo tube is actually one of the best tubes for the HD 650/6XX for Pure Soul and Warmth listening with its midrange being ever so silky and honey butter like.
r/positive
the HD58X Sennheisers just destroy them on every metric.
r/positive
My 58x is safe :) Great headphones
r/neutral
So far i've seen DT 770 and 990 Pro, 700 and 900 Pro X, ATH-M50x, MDR-7506, Sennheiser HD 25, and now the HD 600s.
r/neutral
i know this is about the 580s
r/positive
I stumbled on some open back Sennheiser HD 480 Pro headphones in a secondhand shop for $50 that are rocking my world. Theyโve more than doubled my hours of listening per day.
r/neutral
I used to not be able to justify the jump from something like the HD598 to the Sundara
r/positive
As one of the reviewers says 'you can make the HDB630 sound like the M4, but you can't make the M4 sound like the HDB630'.
r/neutral
The HD400s were my first planarโs and really blew my mind, but the Sundara are in a different league
r/positive
I have... an HD8XX
r/neutral
have the same backwards cup design as the hd700.
r/positive
Man I remember the days when the Sennheiser HD25-1 ii was put through the wringer by almost everyone I knew who owned them.
r/neutral
Now I own an... HD 550 for the microphone it can be bundled with. I look at them more as tools than something to hoard, value, and show off.
Showing 15 of 16 reviews
Specifications
- Driver
- 42mm
- Frequency Response
- 8Hzโ41.5kHz
- Impedance
- 300ฮฉ
- Type
- Open-back
- Weight
- 260g
- Connectivity
- 6.35mm + 4.4mm balanced
- Noise Cancelling
- No
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Head-to-head
Sennheiser HD 660S2 vs alternatives
How it stacks up against the top-ranked alternatives in the same category.
๐ฆ
#2Bose
vs Bose QuietComfort Ultra Headphones
-19% sentimentยท+14 more mentions
#9Hifiman
vs HE1000 Unveiled Full-Size Over-Ear Open-Back Planar Magnetic Headphone with Stealth Magnets for Audiophiles, Home & Studio Listening
-19% sentimentยท+15 more mentions
๐ฆ
#10HiFiMAN
vs HiFiMAN Sundara
-7% sentimentยท+8 more mentions
๐ฆ
#21Sennheiser
vs Sennheiser Momentum 4 Wireless
+6% sentimentยท+14 more mentions
Frequently asked
Sennheiser HD 660S2: What people ask
Is the Sennheiser HD 660S2 worth it?
With 89% positive sentiment among Redditors, many consider the HD 660S2 a worthwhile purchase. It's often praised for its sound quality and perceived as a great value at around $179.
Who is the Sennheiser HD 660S2 best for?
The HD 660S2 is best for audiophiles seeking an 'endgame' headphone experience. Some Redditors refer to them as 'dream headphones' due to their sound quality.
What are the biggest complaints about the HD 660S2?
Common complaints include a bright sound signature and that the headphones are not perfectly flat. Some users also note the bass might not be as strong as ultra-high-end headphones.
Does the HD 660S2 require an amplifier or EQ?
Redditors mention that the drivers handle lower midrange and bass well with an amplifier or EQ. This suggests an amp or EQ can enhance the listening experience.
Are there other Sennheiser models Redditors consider?
While discussing headphones, Redditors frequently mention other Sennheiser models like the HD 6XX, HD 58x, and HD 490 Pro, each with their own sound characteristics.
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