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About the HD 660 S2
The Sennheiser HD 660S2 is a high-end open-back headphone known for its dynamic and natural sound profile. It features a 38 mm transducer with a frequency response of 8 Hz to 41,500 Hz, making it suitable for detailed audio reproduction across a wide range of frequencies. The headphones have an impedance of 300 ohms and a sound pressure level (SPL) of 104 dB at 1 kHz with 1 Vrms. They are designed to provide a warm and detailed listening experience with improved sub-bass extension compared to their predecessors. The HD 660S2 includes two detachable cables, one ending in a 6.3 mm single-ended stereo jack and the other in a 4.4 mm balanced stereo jack, along with a 6.3 mm to 3.5 mm adapter.
Specifications
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