Sennheiser HD 660 S, Headphones, Sennheiser Audiophile Range, New transducer system developed by Sennheiser, Circumaural, Open, Dynamic, Two-sided cable routing, Maximum sound pressure level: 104 dB SPL @ 1 kHz, 1V RMS, Impedance: 150 Ohm, Frequency range: 10 - 41,000 Hz, Distortion factor at 1 kHz < 0.4, Weight: 260 g@+*Cables included:*@+@+, 3 m cable with 6.3 mm jack, 3 m cable with 4.4 mm jack balanced, Adapter cable 6.3 mm jack to 3.5 mm jack
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