Sennheiser HD 660 S, Headphones, Sennheiser Audiophile Range, New transducer system developed by Sennheiser, Circumaural, Open, Dynamic, Cabling from both headphones, Max. sound pressure level: 104 dB SPL @ 1 kHz, 1V RMS, Impedance: 150 Ohm, Frequency range: 10 - 41,000 Hz, Total harmonic distortion at 1 kHz
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