Headphone Orthodynamic Planar Yamaha HP-50A

Headphone Orthodynamic Planar Yamaha HP-50A Made in Japan Very good condition. Near mint ■ Orthodynamic semi-open model ■ 46 mm diaphragm 12 micron polyester diaphragm ■ Impedance 150 ohms for stereo ■ frequency range 20 - 20,000 Hz ■ Permitted input 3000 mW ■ Sensitivity 93 dB / mW ■ Cable 2.4 m straight cord ■ Weight 230 g (including cable) ■ Dibuat tahun 1976 - 77 ■ Discontinued sejak 1985