Grado is famous for their remarkable headphone and phono cartridge designs and hold over 48 patents. Company founder, Joseph Grado is credited as the inventor of the stereo moving coil phono cartridge. He is responsible for more innovations in phono cartridge design than any other person in our lifetime and was inducted into the Audio Hall of Fame in 1982.Time honored manufacturing know how and painstaking attention to design detail allows previously unobtained levels of pitch control, harmonic accuracy and bass quality to be achieved. All Grado headphones and cartridges are hand made to Grado's full performance specifications... nothing leaves the factory unless it sounds pure Grado.