Sennheiser HD 660S2 Review – Check What It Can Offer

Sennheiser HD 660S2 comes with rich, spacious sound signature, improved low-end performance, and comfortable open-back design. With subtle upgrades from the original HD 660S, this model hits the sweet spot for serious listeners seeking warmth, clarity, and extended bass without sacrificing comfort or build quality.

Table Of Contents hide
1 What Sennheiser HD 660S2 Offer?
2 Pros & Cons
3 Comparison

What Sennheiser HD 660S2 Offer?

  • The Sennheiser HD 660S2 has a refined 38mm dynamic transducer for a natural, immersive soundstage with excellent clarity and instrument separation.
  • Sennheiser HD 660S2 has enhanced low-end tuning for deeper, warmer bass that adds richness to modern music and cinematic audio.
  • It has an open-back design to flow air through the earcups, creating a spacious and realistic listening experience.
  • The Sennheiser HD 660S2 has a lightweight frame with plush velour earpads to provide exceptional comfort during long listening sessions without ear fatigue.
  • Sennheiser HD 660S2 has a 300-ohm impedance with high sensitivity for enabling better performance with dedicated headphone amps and high-quality audio interfaces.
  • It has detachable cables with balanced and unbalanced options for offering flexible connectivity to a wide range of high-fidelity audio setups.
  • The Sennheiser HD 660S2 has a wide frequency response from 8Hz to 41.5kHz for capturing subtle details across the entire audio spectrum with precision and depth.
  • Sennheiser HD 660S2 has durable construction with premium materials to ensure long-term reliability and consistent performance in home or studio environments.

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Pros & Cons

Pros
  • Wide, natural soundstage with open-back design

  • Richer bass compared to HD 660S

  • Comfortable fit with soft velour earpads

  • Comes with balanced and unbalanced cables

  • Suitable for high-resolution listening and mixing

Cons
  • Needs a dedicated DAC/amp to reach full potential

  • Non-portable, best suited for stationary use

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Comparison

FeatureSennheiser HD 660S2Sennheiser HD 660SHIFIMAN Sundara
Driver Type38mm Dynamic38mm DynamicPlanar Magnetic
Open/Closed DesignOpen-backOpen-backOpen-back
Impedance300 ohms150 ohms37 ohms
Frequency Response8Hz – 41.5kHz10Hz – 41kHz6Hz – 75kHz
Weight260g260g372g
Comfort LevelHighHighModerate
Cable TypeDetachableDetachableDetachable
Sound SignatureWarm, extended bassNeutral, less bassBright, analytical
Amplifier NeededRecommendedOptionalMinimal
Use CaseAudiophile listeningMixing & masteringCasual + analytical listening
PriceCheck HD 660S2 PriceCheck HD 660S PriceCheck HIFIMAN Price

FAQ

Is the Sennheiser HD 660S2 suitable for casual listening?
Yes, while it’s designed for audiophiles, the HD 660S2 is easy to enjoy with various music genres thanks to its rich, natural sound and enhanced bass.

Do I need a headphone amplifier for the HD 660S2?
It works from most sources, but a headphone amp or DAC will help it reach its full sonic potential, especially due to the 300-ohm impedance.

What is the difference between the HD 660S and HD 660S2?
The HD 660S2 offers deeper bass and a smoother tuning compared to the original HD 660S, making it more engaging for modern music.

Can I use the HD 660S2 for gaming?
Yes, its wide soundstage and clear imaging make it great for single-player and atmospheric gaming, but it lacks a built-in mic for multiplayer.

Is the HD 660S2 good for mixing and mastering?
It can be used for mixing thanks to its accuracy, especially in the mids and highs, but producers may still prefer the HD 600/650 for neutrality.

Are the cables replaceable on the HD 660S2?
Yes, the headphones come with two detachable cables (4.4mm balanced and 6.3mm unbalanced), and you can swap them for custom options.

Is the Sennheiser HD 660S2 portable?
No, it’s not designed for on-the-go use. It’s best used in quiet, stationary environments like a home studio or listening room.

Does the HD 660S2 leak sound?
Yes, like all open-back headphones, it leaks sound, so it’s not suitable for public spaces or recording near microphones.

How does the HD 660S2 compare to closed-back headphones?
It offers a wider soundstage and more natural audio but lacks the noise isolation and punchy bass of closed-back models.

Is the HD 660S2 comfortable for long sessions?
Yes, the lightweight design and velour ear cushions provide excellent comfort even during multi-hour listening.

Can I use the HD 660S2 with a phone or tablet?
You can, but it may not sound its best. A portable DAC or headphone amp improves the experience significantly.

What kind of music sounds best with the HD 660S2?
It performs exceptionally well with classical, jazz, acoustic, vocal, and instrumental music, though its extended bass also supports modern genres.

Are there any accessories included in the box?
Yes, the box includes a 6.3mm unbalanced cable, a 4.4mm balanced cable, and a storage pouch.

Is the build quality reliable?
Yes, the HD 660S2 is built to last with premium materials and a robust design, consistent with Sennheiser’s reputation.

Is there a break-in period for the HD 660S2?
Some users report slight improvements in warmth and clarity after a few dozen hours of use, though it sounds excellent out of the box.

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