The traditional RP planar magnetic driver, recognized in music studios around the world, has been significantly renewed; the T50RP has evolved into the "mk4".

This product is a headphone equipped with a significantly renewed RP driver with a full-field-driven planar diaphragm, which was originally developed by Fostex. RP drivers have been used in a variety of models and have been recognized by musicians and engineers in music studios around the world as monitor headphones. The 4th generation RP headphones are the next generation of RP headphones with the evolution of the traditional RP driver and a new housing design that further refines the sound of the planar diaphragm. RP and RP Technology are Fostex’s proprietary technologies that move the entire surface of the planar diaphragm in regular phase (Regular Phase).