Beyerdynamic Dt48

I had a DT-48, black, low impedance (25 ohm?), 1974. I had a DT-48s, 8 ohm with passive transformer, purchased with round cushions, replaced with standard oval cushions, 1974. The DT-48s came with a beautiful "skai" carry case. I had a DT-48, black, high impedance (200 ohm?), 1975.   I don't recall that any of these sounded different from each other. The cushions then were loose and I note today the DT-48E cushions are frozen(?) in place.

I can confirm now that the current DT-48E with the sealed cushions has a very high fidelity sound similar to the better headphones in its price range, as long as the seal between your head and the cushions is very good (not wearing glasses or interrupting the seal with a lot of hair). This is very unlike the low-fi sound of the 1970's DT-48 series.