Bowers & Wilkins P7 Wired Over Ear Headphones, Black With P7, we have created a headphone driver that works more like the drive unit in a hi-fi speaker, with a diaphragm focused purely on the job it's supposed to do: generate sound. Which means a drive unit with a more precise, controlled movement. Connectivity Technology: Wired P7's ear pads feature a dual cavity cushion design that helps the pads mold to the contours of the wearer's head. This design maintains a consistent volume of air between the drive unit and the surface of the ear at both sides of the head. Not only is stereo imaging enhanced, but the sound is optimized for every listener. Frequency range-10Hz to 20kHz