Seventy-three years young, Sennheiser has long dominated the hi-fi headphone market, and the new HD 660 S shows why. This modern new take on a classic open-back design is made with great care, using hand-selected transducers and sturdy detachable cables. The earpads and headband are thickly padded and the HD 660 S is very comfortable to wear for long periods. Plus, it’s hard not to appreciate its warm, relaxed, and friendly sound that outperforms many models twice the price. It is a great option for hi-fi enthusiasts, especially when it comes to a high-quality source.