The T20RPmk3 from the Fostex RPmk3 series are successors of the legendary RPmk2 series stereo headphones, which were widely popular with audio professionals for decades. The redesigned and refined headphones continue with the tradition of excellence of the T-series. Their diaphragm is made of polyimide film with copper foil etching incorporating the Fostex proprietary Regular Phase (RP) technology to ensure high accuracy and maximum detail in sound reproduction, making these open-backed headphones perfect for monitoring in studio situations.