Sennheiser HD660S2 open-back headphones, hero product shot
Sennheiser HD660S2 open-back headphones, additional product view
Sennheiser HD660S2 open-back headphones, additional product view
Sennheiser HD660S2 open-back headphones, additional product view
Sennheiser

Sennheiser HD660S2 Open-Back Headphones

Sale price$679.95

The latest evolution of Sennheiser's legendary HD 600 series, the HD 660S2 delivers a tuning refinement over its predecessor with more extended bass and a smoother overall response, while preserving every bit of the midrange magic that made the series famous.

Type & Technology

Over-ear, open-back, dynamic. 38mm transducer with Sennheiser's precision-engineered aluminum voice coil. Handcrafted in Ireland.

Sound Character

Warm, refined, and exceptionally natural. The HD 660S2 extends bass response further than its predecessor while maintaining the open, airy midrange presentation that audiophiles have returned to the HD 600 series for decades. Treble is smooth and well-extended, and the overall tuning is forgiving of lesser recordings without masking detail in well-produced material.

Build & Comfort

Classic HD 600 series construction with a comfortable headband, premium earpads, and the detachable 2-pin cable system. Lightweight and suitable for long listening sessions. Available in a striking new black colorway.

Best For

Audiophiles who love the HD 600 series character and want the most musically refined version of it yet, particularly for vocals, acoustic instruments, and jazz.

What's in the Box

  • Sennheiser HD 660S2 headphone
  • 3m cable with 4.4mm balanced jack
  • 1.8m cable with 3.5mm jack
  • 6.35mm adapter

Specifications

Specification Value
Style Over-ear, open-back
Transducer type Dynamic
Driver diameter 38mm
Frequency response 8 Hz – 41.5 kHz
THD <0.04% @ 1 kHz / 100 dB
Sensitivity 104 dB SPL / 1 Vrms
Impedance 300 ohms
Weight 260g (without cable)

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