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Sennheiser HD 660S2 Audiophile Reference Wired Over-Ear Headphones - Black (HD 660s2)

Sennheiser HD 660S2 Audiophile Reference Wired Over-Ear Headphones - Black (HD 660s2)

$598

Sennheiser HD 660S2 Audiophile Reference Wired Over-Ear Headphones - Black (HD 660s2)

700240
Bonus
$598

$20 Harvey Norman Bonus Gift Card!

$16.61^ approximately

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Available on 36 months of equal Interest Free instalments:

approximately per month

^ Total repayments $598 (excluding fees). Min purchase of $500 applies. Offer ends 30/06/2026. Equal monthly payments required. Lending criteria, T&Cs & fees apply incl. a $55 estb. fee & $65 annual fee ($32.50 half yearly). Standard interest rate (currently 29.49% p.a.) applies after interest free term ends. Exclusions may apply. *Further information on rates and fees can be found at gemfinance.co.nz. Credit provided by Latitude Financial Services Ltd.

How it works
Description

$20 Harvey Norman Bonus Gift Card!

The Sennheiser HD 660S2 Audiophile Reference Wired Over-Ear Headphones combine incredible sound performance and effortless wearability. This device features 38 mm drivers that produce the full character of your music—rich, smooth, and distortion-free. With its open-back build and lightweight finish, every listening moment feels as good as it sounds.

Key Features

  • Hear Every Detail: Experience pure, natural audio through 38 mm dynamic drivers that deliver rich timbre and deep, accurate sub-bass across an extended 8 Hz–41,500 Hz range. The open-back design and vented magnet system produce a spacious, distortion-free soundstage for true audiophile listening.
  • Exceptional Comfort: This headphone features open elliptical earcups and velour pads for comfort and breathability. Its lightweight, ergonomic design ensures a natural, pressure-free fit for hours of listening.
  • Engineered for Clear Audio Performance: The Sennheiser headphones feature detachable, para-aramid reinforced OFC copper cables for pure signal transmission and minimal handling noise.
  • Premium Craftsmanship: Expertly designed in Germany and crafted in Ireland, the HD 660S2 delivers uncompromising build quality and precision tuned for true audiophile excellence.
Specifications
All Product Details
Brand Sennheiser
Product Type Over-Ear Headphones
Model Number HD 660s2
Colour Black
Headphone
Driver Type (Headphone) Dynamic, Open
Driver Size (Headphone) 38 mm
Sensitivity/Sound Pressure Level 104 dB (1V)
Headphone Frequency Response 8 Hz - 41,500 Hz
Impedance (Headphone) 300 ohm
Audio
Adapter Included Yes
Adapter Type 6.3mm to 3.5mm
Connectivity
Wired / Wireless Wired
Connectivity Type 3.5mm Jack
Dimensions
Product Weight 0.4 kg
Warranty
Manufacturers 24 Months
Reviews

Expert Reviews

Customer Reviews

Sennheiser HD 660S2 Audiophile Reference Wired Over-Ear Headphones - Black (HD 660s2) is rated 4.7 out of 5 by 27.
Rated 5 out of 5 by from They are better Nearly every review I have read and YouTube video I have watched has told me that the 600’s and 650’s are superior to the newer 660s2’s despite their age, so I believed them and bought some 650’s. Yes they are exceptional cans and deserve their legendary status, but curiosity got the better of me and decided to try the 660s2’s. Granted I’m no expert, but I think the 660s2’s are better headphones in every single department. Ever so slightly more comfortable, a smidge more bass, a tad more detail, a bit wider soundstage and a more modern, stylish paint job. I think they are a step forward, not by much, but how could they be? Sennheiser shot themselves in the foot all those years ago by setting the bar so high.
Date published: 2024-01-04
Rated 5 out of 5 by from Awesome upgrade after 20y Sound is superb. A great upgrade from HD 650. Not as amplifier dependant. Not as colored as 650. Just as detailed & vivid but more neutral overall, plus subbass which is lacking in 650.
Date published: 2023-10-21
Rated 5 out of 5 by from Sennheiser knows what they are doing, Bravo! Solid construction. you can feel the quality. Don't let the plastic deter you from buying these. The clamping force is a little much, but I have a large head. I used my headphone holder, with a couple of folded cloths, to widen the clamping and it now fits perfect. You can wear these all day with no ear fatigue or head pain. The sound is amazing. The sub bass is present without being muddy. I EQ with my HD600 but the 660S2 does not need it. They pair will with my Schiit Valhalla 2 tube amp. Not only is this an upgrade to the HD600 (for me), but the 660S2 stands on its own as a great, open-back headphone
Date published: 2025-02-11
Rated 4 out of 5 by from My HD 660S2 experience So far, I love these headphones. I listen to music, obviously and they sound incredible. It almost feels like it engulfs me and transports me to a happier place. I also game a lot, and they still sound incredible, the low thuds of artillery fire and the high pitches poorly oiled machinery moving through fields, it sounds like I'm really there at least. (Though maybe not the greatest place to be pulled into) With all my praise I am currently giving these headphones, you may wonder why I felt like I had to give it 9 stars. They are tight, they like to squeeze my head and makes it hard to have on for extended periods. I will admit they are looser than the HD650's out of the box, still tight. However I am the type that struggles to find a hat that fits in stores, so tight headphones are to be expected. All in all, I highly recommend these headphones.
Date published: 2023-02-27
Rated 5 out of 5 by from Best one so far I went to these from some DT 990 Pro's 250ohm. and lemme tell you something. its been about 2 months but im still sold that these will be my forever headphones. I have never felt that way about headphones. They sound FULL, very full. Super detailed and clean, and pretty good sub bass. I have them paired with a FiiO k5 pro
Date published: 2024-02-02
Rated 2 out of 5 by from Not the upgrade it is purported to be Touted as the upgrade to the HD 650, but it's more like the upgrade to the HD 58X from Drop. Doesn't have any of the midrange magic of the 6 series, has meaningfully brighter and harsher treble, and is significantly more expensive. Looks incredible (love the colorway) but sonically it's a miss for me across the board.
Date published: 2024-01-22
Rated 5 out of 5 by from Supreme Quality I am very happy with this purchase. Supremely comfortable to wear, very nice/quality engineering produces a high fidelity sound experience... I particularly appreciate Sennheiser following up with the sound samples via email, whereby I received a 'guided tour' of the capabilities built into these headphones... Supreme quality - excellent sound reproduction - no regrets, would buy again...
Date published: 2025-05-05
Rated 4 out of 5 by from Review from a person never had a Senn before As someone who never had a Senn before, the S2 simply matches all of my expectation of the iconic Senn sound. Enough bass but not muddy, warm mid and not fatiguing highsl, combined with wide and precise soundstage. With everything combined, the first time hearing music playing on the S2 did not surpurise me like the Hifiman Sundara or Beyer 1990pro, but I slowly enjoy music on the S2 more than i did on the Sundara or Beyers. However, I do wish the mids to be a little foward and bright.
Date published: 2023-02-25
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Delivery
Delivery

We aim to dispatch orders within 2 days. Delivery costs are calculated based on your location and the size of your order. Furniture may take up to 8 weeks to deliver as most products are made specifically for your order. Some Customer Direct products are shipped from overseas and may take longer to arrive. Some goods may take longer to deliver if a product is currently not in stock. A staff member will contact you where this occurs.

Easy returns

If you feel your product has failed a Consumer Guarantee (as defined by New Zealand Consumer Law) then don't worry you can easily return it to your local Harvey Norman store. We'll even pay for the postage if you live in an area where there is no store. Our returns policy covers any purchased item ( conditions apply).

What's in the box
  • HD 660S2 headphones
  • 6.3 mm cable (1.8 m)
  • 4.4 mm cable (1.8 m)
  • 6.3 mm to 3.5 mm adapter
  • Carry pouch
Questions & Answers
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Pricing Terms

Limit 2 per customer. Personal shoppers only. Trade not supplied. Available from Thursday 4th June 2026 until midnight Tuesday 16th June 2026.

Offer Terms

Harvey Norman Bonus Gift Cards are issued on receipt of goods. See www.harveynorman.co.nz/gift-card-terms-and-conditions.html or in store for terms, conditions and exclusions. Offer ends 5:59pm Tuesday 23rd June 2026.

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