Sennheiser HD 660S2
Sennheiser HD 660S2, Headphones, Wired, Circumaural, Open design, Dynamic, Frequency range: 8 - 41,500 Hz, Impedance: 300 Ohm, Sound pressure level: 104 dB (1V), Driver size: 38 mm, Distortion factor: <0.04% (1 kHz, 100 dB), Velour ear pads, Two-sided...