Updated and improved version of the Shure SRH240 headphones (featuring a re-engineered headband and earcup construction for a broader range of motion, increased comfort, and an enhanced ergonomic fit). With 40mm neodymium dynamic drivers optimized for general listening and monitoring, the SRH240A headphones reproduce deep bass with clear mids and highs. Impedance, power handling and sensitivity are all calibrated for connection to most consumer and professional audio devices. Closed back, circumaural design rests comfortably over the ears and reduces background noise. 20Hz-20kHz frequency response, 500mW maximum input power, 6.56' cable, 38 ohm impedance.