Enjoy your music on a completely new level with the Sennheiser HD 660S2. These headphones offer an intimate, relaxed sound signature combined with outstanding precision and exceptional comfort, now with extended sub-bass for a deeply moving experience. Feel the lowest notes and the kick of the bass drum as if you were there, thanks to optimized surrounds, transducer airflow, and coils that double the sound pressure at the lowest octaves. The relaxed tone and open-back design ensure comfort for long listening sessions, with a warm tuning, smooth treble, and strong bass. The 38mm high-performance transducers, built in Ireland, feature a steel mesh damping system and a vented magnet system to minimize distortion. An ultra-light aluminum voice coil with 300-ohm impedance provides excellent impulse response. The velour earpads and ergonomic headband offer exceptional comfort and tactile pleasure. With a global 2-year warranty, these headphones are designed in Germany and made in Ireland.