Walkman: A História Ilustrada (1979–2004) A timeline of Sony’s cassette Walkman models from 1979 to 2004 - EP.27 - 1992: SONY WALKMAN WM-EX909

 

Released in 1992, the WM-EX909 used a rare dual-head playback system. Instead of a single

 auto-reverse head, it employed two fixed playback heads, each aligned for one direction. This

 preserved consistent sound in both directions without mechanical adjustment, a solution

 reserved for Sony’s top-tier models.