Sennheiser HD 660 S2
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Sennheiser HD 660 S2
Type:full size (over-ear)
Connection:3.5 mm, 6.35 mm
Frequencies:8 – 41500 Hz
Sensitivity:104 dB
Impedance - 300 Ohms, wide frequency range, rich equipment.
All specifications
Specifications HD 660 S2
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E-Catalog UK editor, Headphones
Olexandr Cherkashchenko, edited 08.04.2026
The information in the model description is for reference purposes.
Always clarify the specifications and configuration of the product with the online store manager before purchasing.
Catalog Sennheiser 2026 - new arrivals, bestsellers, and the most relevant models Sennheiser.
Always clarify the specifications and configuration of the product with the online store manager before purchasing.
Catalog Sennheiser 2026 - new arrivals, bestsellers, and the most relevant models Sennheiser.
Everything You Need to Know About Headphones: A Complete Technical GuideThe choice begins with understanding the design and features.
What characteristics should good headphones have?Guide to key features of headphones
Buy Sennheiser HD 660 S2
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Sennheiser HD 660S2 Black | £279.99 |  | |||
| £346.80 |  | ||||
| £369.00 | | ||||
Sennheiser HD 660S2 Open Back Headphones 700240 | £400.00 |  | |||
Series Sennheiser HD (overhead)Compare using chart →
overhead, open, wired, detachable cable, 3.5 mm, 6.35 mm, 1.8 m, no microphone, 6 – 38000 Hz, 120 Ohm, 200 mW, battery: with case + maximum
overhead, open, wired, detachable cable, 3.5 mm, 6.35 mm, 3 m, no microphone, 10 – 39500 Hz, 300 Ohm
студийные, overhead, open, wired, detachable cable, 3.5 mm, 6.35 mm, 3 m, no microphone, 12 – 40500 Hz, 300 Ohm
overhead, open, wired, detachable cable, 3.5 mm, 4.4 mm (Pentaconn), 6.35 mm, 1.8 m, no microphone, 8 – 41500 Hz, 300 Ohm
overhead, closed, combined, detachable cable, 3.5 mm, 1.5 m, Bluetooth v5.0, AAC, aptX, active noise cancellation, voice assistant, foldable, 18 – 22000 Hz, L-plug, battery: 600 mAh, up to 30 h
overhead, open, wired, detachable cable, 3.5 mm, 6.35 mm, 3 m, no microphone, 12 – 38500 Hz, 50 Ohm, battery: with case + 1.2 m — cable with microphone
overhead, closed, combined, detachable cable, 3.5 mm, USB-C, 1.2 m, Bluetooth v5.2, AAC, aptX, active noise cancellation, 6 – 40000 Hz, 480 Ohm, battery: 700 mAh, up to 60 h
студийные, overhead, closed, wired, 3.5 mm, 6.35 mm, 3 m, no microphone, foldable, 8 – 25000 Hz, 64 Ohm
overhead, closed, wired, detachable cable, 3.5 mm, 1.4 m, foldable, 18 – 20000 Hz, 18 Ohm, L-plug
overhead, open, wired, detachable cable, 3.5 mm, 6.35 mm, 1.8 m, no microphone, 5 – 36000 Hz, 130 Ohm
overhead, closed, wired, detachable cable, 3.5 mm, 6.35 mm, 3 m, 10 – 28000 Hz, 23 Ohm, battery: with case + 1.2 m — cable with microphone
студийные, overhead, closed, wired, 3.5 mm, 6.35 mm, 1.8 m, no microphone, 6 – 30000 Hz, 150 Ohm
for DJ, overhead, closed, wired, detachable cable, 3.5 mm, 6.35 mm, 1.5 m, no microphone, 16 – 22000 Hz, 70 Ohm
overhead, closed, combined, detachable cable, 3.5 mm, Bluetooth v4.0, NFC, aptX, active noise cancellation, foldable, 18 – 22000 Hz, 18 Ohm, L-plug, battery: up to 19 h
студийные, overhead, closed, wired, 3.5 mm, 6.35 mm, 2 m, no microphone, 20 – 20000 Hz, 32 Ohm, 500 mW, battery: with case + maximum
overhead, closed, wired, detachable cable, 2.5 mm (micro-Jack), 1.4 m, foldable, 18 – 20000 Hz, 18 Ohm
overhead, open, wired, detachable cable, 6.35 mm, 3 m, no microphone, 4 – 51000 Hz, 300 Ohm
Popular questions
Which sources and connectors are suitable for connection?
The Sennheiser HD 660 S2 come with detachable cables for 6.35 mm and balanced 4.4 mm Pentaconn connections, as well as a 3.5 mm adapter. This is convenient for use with a stationary amplifier, a player with a balanced output, and a standard mini-jack without having to purchase an additional adapter.Source:Specifications
Do you need a separate amplifier for the Sennheiser HD 660 S2?
Recommended: at 300 ohms, the headphones perform at their best with a DAC/amplifier or a player with sufficient power headroom. A smartphone or standard laptop may work, but may not always provide comfortable headroom for volume and dynamics.Source:SpecificationsExpert reviews
Can they be used for listening on the go or in the office?
The Sennheiser HD 660 S2 are better suited for a quiet room, a home workstation, or a stationary audio system. These are open-back over-ear headphones, so this format is less practical for outdoor use, public transport, and noisy offices.Source:SpecificationsExpert reviews
How comfortable are the Sennheiser HD 660 S2 for extended listening?
At 260 g and with velour ear pads, they do not feel heavy and are suitable for extended sessions at home. It is worth noting that the out-of-the-box fit may seem fairly tight, although the pressure is distributed without any pronounced points of discomfort.Source:SpecificationsExpert reviews
How do the Sennheiser HD 660 S2 sound?
These headphones have a near-neutral, detailed sound signature: vocals, acoustic instruments, and the positioning of individual sounds come through particularly well. This version has deeper bass than the HD 660S, but those who enjoy a very powerful physical low-end impact may find it lacking.Source:Expert reviews
Is it worth upgrading from the HD 660S?
The Sennheiser HD 660 S2 is worth considering if the previous version lacked bass depth and texture. The new model also offers slightly more pronounced treble and more precise imaging, but the difference in soundstage does not seem radical.Source:Expert reviews
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We recommendCompare using chart →
overhead, open, wired, detachable cable, 3.5 mm, 2x3.5 mm, 2.5 m, 5 – 40000 Hz, 48 Ohm, 30 mW
overhead, open, wired, detachable cable, 3.5 mm, 6.35 mm, 1.8 m, no microphone, 5 – 36000 Hz, 130 Ohm
студийные, overhead, closed, wired, 3.5 mm, 6.35 mm, 3 m, no microphone, 5 – 35000 Hz, 80 Ohm, 100 mW, battery: with case + monitor headphones
gaming, overhead, closed, combined, detachable cable, 3.5 mm, Bluetooth, radio channel, multichannel, battery: up to 70 h
gaming, PlayStation 5, Switch, overhead, closed, wireless, Bluetooth v5.3, AAC, radio channel, 3D sound, 20 – 20000 Hz, 64 Ohm, battery: up to 200 h
gaming, overhead, closed, combined, detachable cable, 3.5 mm, 1.2 m, Bluetooth v5.0, radio channel, active noise cancellation, 10 – 40000 Hz, 38 Ohm, battery: up to 44 h, with case + when using a radio channel, for BT - 36 hours
gaming, PlayStation 4, PlayStation 5, Nintendo Switch, overhead, closed, combined, detachable cable, 3.5 mm, 1.3 m, Bluetooth v5.2, radio channel, multichannel, 20 – 20000 Hz, 32 Ohm, battery: up to 50 h
gaming, overhead, closed, combined, Bluetooth v5.2, radio channel, 20 – 20000 Hz, battery: up to 24 h