Designed for the most demanding listeners, the HD 660 S exceeds the performance of its HD 650 precursor. Detailed and dynamic, with a wide and balanced frequency response, the HD 660 S is extremely accurate and musically expressive. The very low 150-ohm impedance makes it easy to connect directly with both premium home systems and mobile audio devices.
Advanced transducers - The HD 660 S uses conception transducers with extremely light aluminum coils coupled to stainless steel membranes. This combination provides exceptional transient response and better control of diaphragm movement, reducing distortion. Furthermore, the transducers are produced and adapted to extremely small tolerances (± 1 dB) to guarantee superb performance.
Versatile connectivity - The HD 660 S is equipped with two detachable cables reinforced in para-aramid fiber with high conductivity OFC copper cable, to ensure signal integrity and low background noise. One cable has a 6.35mm stereo plug (including a 3.5mm adapter), while the other is equipped with the Pentaconn balanced 4.4mm stereo plug. Balanced connectivity reveals the broad performance potential of the HD 660 S when paired with the balanced output of a digital audio player or headphone amplifier like the Sennheiser HDV 820.
Superior comfort - The HD 660 S is designed for pure listening pleasure. Its open architecture is robust but light, allowing the flow of air to the ears to keep them fresh even during long listening sessions. The large elliptical pavilions are designed according to the anatomy of the ears, and are equipped with soft, velvet-covered pads. The headrest arch
padded completes the comfort package of this headset to offer you hours and hours of ultimate listening pleasure.
Improved new design transducers for really low harmonic distortion
Manual selection headphone driver with exact left and right coupling tolerances (± 1 dB) for maximum accuracy
150 Ohm nominal impedance to allow a direct connection with fixed HiRes readers but also mobile
Detachable cable reinforced in para-aramid fiber with high conductivity OFC copper cable, for a very low background noise
The HD 660 S is the natural heir to the legendary HD 650. This open dynamic headphone features low impedance transducers (150-ohm) that produce a reference-class sound both when connected to a home Hi-Res system, and when connected to a mobile audio system. HD 660 S is a piece of German engineering designed with elegance to offer a transparent and accurate sound, with an expressiveness that completely immerses you in the emotion and nuances that music wants to convey.
Impedance: 150 Ω
Connectors: 6.35 mm / 4.4 mm Pentaconn
Frequency response: 10 - 41,000 Hz (-10 dB)
Sonoral pressure level (SPL): 104 dB at 1V 1kHz
Total harmonic distortion and noise (THD + N): <0.04% (1 kHz, 100 dB)
Headset translator: Dynamic, Open
Weight (without cable): Approx. 260 g