Yamaha YH-5M (1978) was a Japan-exclusive set of "Orthodynamic" headphones that "us[ed] a driver type known generically as isodynamic, planar-magnetic, or magnetostatic incorporating characteristics of both dynamic and electrostatic driver design" (via hifiheadphones.co.uk)

#Headphones #Orthodynamic #JapaneseDesign #Yamaha #YH5M