Sennheiser HD25SP II headphones offer a more affordable version of the superb HD25. Sennheiser HD25SP II feature a closed-back design, delivering high attenuation of background noise. HD 25-SP II headphones are ideal for studio monitoring, studio recording, Hi-Fi and outdoor applications. Sennheiser HD25SP II feature a simpler headband and a slightly different capsule design to that of the HD 25-1 II.