These are Superex professional ST-ProB made in Yonkers . I spent the late 70's all the way through into the late 80's listening to music through this headphones . They are a 2 way design separate woofer,tweeter and a small crossover, very huge sound stage for closed backs and with 3.5 inch...

I think we are forgetting the 1982 Audio Technica P Point 1 through 6 ultralight portable headphones. 2 years before the Koss portapro, they where far more neutral and transparent bass was lighter but well controlled. I had the ATH 0.1 they where the lightest at 50 grams ,30 ohms and and went...