Bang & Olufsen U70 Headphones

The U70 were stereo headphones manufactured by the Bang & Olufsen Corporation. They used the orthodynamic semi-open system for sound reproduction. Their frequency range was 16 Hz to 20 kHz, impedance 140-ohms, and sensitivity 8 mW (at 94 dB). Their power handling capacity was 2-watts (rms), came fitted with a 3-metre cable, and mass 300 g.