Swivelling Earpiece for Single Ear Listening. Extremely Comfortable. Durable ConstructionResponse: 20Hz-20kHz Sensitivity: 106db Impedance: 70 Ohms Power Handling: 1w Weight: 220g. The JTS HP-525 Studio Headphones are of a closed-back circum-aural design for studio quality monitoring in high-noise environments- such as DJ/Disco use- as well as general pro and project studio use.. headphones