WM-D3

Sony introduced the WM-D3 as a more compact alternative to the larger models in the Walkman Professional line, carrying over much of the recording capability associated with the WM-D6C while reducing the size to something closer to the portable DD series.

It was the smallest recorder in the lineup and represented Sony's push to bring field-ready recording into a pocketable format. The design used the direct-drive capstan system associated with higher-tier cassette mechanisms rather than the belt-linked approach common in consumer models.

Full manual control in a frame this small made the D3 a true field recorder, not a cut-down compromise.