Sennheiser HD660S (Black) is rated 5.0 out of 5 by 6.
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Sennheiser HD660S (Black)

Over Ear Open Back Headphones

In-store Clearance item

Open Box Guide Price (1 available across all stores) £359.950000
Last brand new price £429.000000

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These are Clearance items and therefore condition and accessories / promo items supplied may vary. This is also why we use guide prices for in-store items, as managers price these units according to state and completeness.

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Compare (3 max)
”Comfort and great sound quality make these excellent at-home headphones.” ’Trusted Reviews’.

A passion for music

Designed for the demanding listener, the Sennheiser HD660S offers an exceptionally balanced performance. Hand selected speakers are carefully paired, giving these headphones the most consistent sound between channels. Precision, stainless steel fabric diaphragms deliver life-like realism for a true-to-life sound.

Sound that ‘breathes’
Featuring an open back design, the HD660S headphones are able to produce a spacious, ‘out of head’ sound. Although these headphones will leak sound to the outside world, the sound inside is so life-like, it’s like being at your own private performance.

Balanced input option
Supplied with balanced and non-balanced cables, the HD660S maximises the potential of dedicated headphone amps and music players fitted with balanced outputs. Balanced cables minimise interference, enhancing the music’s purity.

Designed for comfort
When something sounds this good, you’re going to want to listen for a while. The HD660S remains comfortable for the longest listening sessions. Elliptical cups fit naturally around your ears, while the breathable earpads are soft to the touch, without being sticky.

Hear every element of music, with the Sennheiser HD660S.
Cable Length
Over Ear, Open Back
Plug size
4.4mm Balanced, 6.35mm Unbalanced, 3.5mm adaptor
Manufacturer's Warranty
2 years
Open back
Over Ear
Weight (KG)
260g without cable
Rated 5 out of 5 by from Col on Sennheiser 660s The headphones give clear and detailed sound and delivery was very prompt.
Date published: 2023-06-26
Rated 5 out of 5 by from Sennheiser hd 660s Top quality product and lightning fast delivery. Excellent
Date published: 2023-06-25
Rated 5 out of 5 by from Clear and detailed sound I purchased these headphones to replace my 25 year old Sennheiser HD 570's, as replacement headband covers are no longer available. These headphones have a similar sound signature but the sound is much more detailed. I'm very pleased with them as I can hear nuances in my music that I've never heard before. If I were to be hyper critical I would say the bass doesn't extend quite as far as it should, but increasing bass via a parametric equaliser rectifies that. Initially they clamp your ears rather too tightly but after a couple of days use they wear in and become very comfortable to wear for extended periods. Overall they produce an excellent sound and are great value for money.
Date published: 2023-06-24
Rated 5 out of 5 by from Headphone delight I was looking for a pair of headphones and the hd660 was on my shortlist and decided to purchase them as they were on offer. Having received them I can say that I was extremely pleased with them, the openness and definition of the music was far superior to my previous set of headphones. I can say that it made me listen again to all types of music and hear the detail that I was missing before. Do not hesitate to purchase these if they are on your shortlist as well.
Date published: 2023-05-30
Rated 5 out of 5 by from Great Headphones, I have quite a few Sennheiser in ear phone's but the ( Hd 660 S ) is the first over ear headphone iv'e bought for a long time and to put it as blunt as possible they are (BRILLIANT ).
Date published: 2023-02-15
Rated 5 out of 5 by from Excellent headphones The sound and comfort is excellent. Worth making sure they are positioned properly, i.e. the ear is clear within the hole of the cushion. For this cost however, I would have included a cord of 1m, for those that listen on personal devices. Not only would this be more convenient, it also increases sound quality to have less cable to run through. Lastly, and perhaps trivially, I would like some more exotic material in the outer construction, such as aluminium, titanium or wood. Perhaps there could be an option for a more luxurious version at a slightly higher price
Date published: 2022-11-03
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  • Representative 21.9% APR (variable)
  • Purchase rate 21.9% p.a. (variable)
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