Walkman: A História Ilustrada (1979–2004) A timeline of Sony’s cassette Walkman models from 1979 to 2004 - EP.9 - 1984: SONY WALKMAN WM-DD2

 

Released in 1984, the WM-DD2 added Dolby B using miniature ICs powered directly by its 3-volt

 supply. Doing so required a full internal redesign. Later DD models refined the sound further, but

 the DD2 marked the first jump in fidelity for the Disc Drive line.