The open back HD 599 delivers impressively natural spatial performance. Topping Sennheisers 500 series, the full sized premium headphone offers near- audiophile levels of sound quality and exceptio large ear cups and soft replaceable ear pads.  You want to treat your ears to audiophile sound quality? This is the Sennheiser HD 5 model for you. With an impressively refined and natural sound and a reached your goal. With the HD 599 you step into the world of audiophile sound. There you will experience outstanding natural spatial performance, brought to you by high-end proprietary Sennheiser tr to headphones that are quite good. The HD 599 will show you what lies beyond that. Be warned: there is no turning back.