Sennheiser HD660S2 Koptelefoon

Features:

Uniquely powerful vented magnet system for minimized distortion
Ultra-light aluminum voice coil with 300-ohm impedance for excellent impulse response
Intimate sound with great timbre and deep, accurate sub bass
Plush ear cushions and open design for maximum comfort
Outstanding quality designed in Germany, made in Ireland

Specifications:

Transducer principle: dynamic, open
Transducer size: 38 mm
Frequency response: 8 – 41,500 Hz
Impedance: 300 Ω
Sound pressure level (SPL): 104 dB (1 kHz, 1 Vrms)
Total harmonic distortion (THD)