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Sennheiser · MANUFACTURER-SOURCED PROFILE

HD 660S2

over-ear · open-back · Wired listening

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Technical profile

Manufacturer figures. Reviewed 2026-09-16. “Not verified” is a data gap.

Brand
Sennheiser
Model
HD 660S2
Fit
over-ear
Design
open-back
Connection
Wired; 6.3 mm; balanced 4.4 mm; 3.5 mm adapter
Active noise cancellation
Not applicable — passive wired design
Driver technology
Not verified
Sensitivity
Not verified
Impedance
300 Ω
Weight
260 g
Driver size
Not verified
Frequency range
8–41,500 Hz
Battery life
Not applicable — passive wired
Bluetooth codecs
Not verified
Water resistance
Not verified
USB audio
Not verified
Microphone
Not verified
Cable
Not verified

Understand this technology

Open-back headphones
Machine-readable records & evidence →

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