The sonic air and space of open-backed headphones, the lack of sonic leakiness of closed-back headphones. That’s an impossible dream, isn’t it? Not according to Sennheiser. With the HD 620S ...

Learn more After my first extended listen to the Sennheiser HD 660S headphones ... Also, these are open-back headphones, meaning they don't block out sound from around you, or from others hearing ...