Legendary sound: on stage, in the studio, and on the road The closed-back HD 25 are purpose-designed, professional monitoring headphones offering high attenuation of background noise. Capable of handling very high sound pressure levels and of extremely robust construction, these headphones perform exceptionally well in loud environments. Ideal monitoring headphones for vloggers, content creators, camera operators, sound crew, and DJs, these are a pair of true sound professionals' working headphones.