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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.
Driver and acoustic performance characteristics
Headphone driver and design characteristics
Size, weight, and appearance
Specifications are community-contributed and may not be accurate or complete. Verify all details with the manufacturer before making purchasing decisions. Terms & Conditions
Components that show up alongside the HD 660 S2 in real systems. A verdict means the pair has been checked for compatibility and headroom — open it to see how the two get along.
The closest alternatives on specs, description and the systems they turn up in, with the specs they share set side by side.
The HD 650's sensitivity is 103 dB against the HD 660 S2's 104 dB, its high-frequency extension 41 kHz against 42 kHz, and its driver size 42mm against 38mm. Both share impedance (300Ω).
Both turn up in the same documented systems.
The HD 600's sensitivity is 97 dB against the HD 660 S2's 104 dB, its high-frequency extension 41 kHz against 42 kHz, and its driver size 42mm against 38mm. Both share impedance (300Ω).
Both turn up in the same documented systems.
The Elex's impedance is 80Ω against the HD 660 S2's 300Ω, its driver size 40mm against 38mm, and its low-frequency extension 5 Hz against 8 Hz. Both share sensitivity (104 dB).
Both turn up in the same documented systems.
The HD 700's sensitivity is 105 dB against the HD 660 S2's 104 dB, its impedance 150Ω against 300Ω, and its driver size 40mm against 38mm. Both share high-frequency extension (42 kHz).
Both turn up in the same documented systems.
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