Sennheiser HD 660S2 Open-Back Headphones Immersion The legendary Sennheiser sound evolves with the new HD 660S2. This exceptional open-back headphone plunges you into a truly intimate listening experience. A key advancement is the dramatically extended sub-bass, which offers greater depth and impact than the previous model. Consequently, your music feels warmer and more natural across all genres. Furthermore, the relaxed sound signature ensures long listening sessions remain utterly enjoyable. This is a refined presentation, perfect for the audiophile seeking both precision and soul. Engineering Sennheiser's commitment to audio perfection is clear in the HD 660S2's design. Firstly, they feature a bespoke 38 mm transducer principle, dynamically open for superb acoustic performance. The uniquely powerful vented magnet system minimises distortion across the entire frequency range. Moreover, the ultra-light aluminium voice coil achieves excellent impulse response. This technical choice, combined with the 300-ohm impedance, guarantees incredible precision and clarity. Therefore, every subtle detail in complex recordings is revealed beautifully. Designed in Germany and meticulously crafted in Ireland, quality is assured. Comfort Long listening sessions demand supreme comfort, and this model truly delivers. The HD 660S2 feels as superb as it sounds, thanks to its lightweight frame and plush, replaceable ear cushions. In addition, the open-back design prevents heat build-up, keeping you comfortable for hours. Furthermore, practicality is key for a flagship headphone. Consequently, the product comes supplied with two 1.8-metre cables: a 6.3 mm standard cable and a balanced 4.4 mm Pentaconn cable. A 6.3 mm to 3.5 mm adapter is also included, ensuring seamless connectivity to a vast range of high-fidelity sources. Feature Detail Transducer Principle Dynamic, open Transducer Size 38 mm Impedance 300 Ohms Frequency Response 8 – 41,500 Hz Voice Coil Ultra-light aluminium Cable Length 1.8 m (x2) Connectors Included 6.3 mm, 4.4 mm balanced, 6.3 mm to 3.5 mm adapter
