Professional Sennheiser DJ Headphones, HD25 Plus Due to their low weight and the option of one-ear listening, the HD 25 Plus headphones are indispensable for mobile monitoringThe closed-back HD 25 Plus 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, e.g. ENG, sound reinforcement, studio monitoring and audio equipment testing. Ideal monitoring headphones for cameramen and DJs, these are a pair of true sound professionals' working headphones.