WM-EX678

An EX-series cassette Walkman from the closing months of 1999, the model uses the same compact chassis as its siblings but emphasized auto-reverse transport, Mega Bass sound enhancement, and full remote-control capability through a dedicated jack. The plastic body includes a clear tape window and basic mechanical buttons, while the single-AA power supply delivers typical thirty-hour runtimes. Groove circuitry added extra bass depth when selected.

Sony kept the EX678 as a simple upgrade path within the series, giving users who wanted remote convenience without Dolby or metal construction an affordable option. It filled a quiet niche for listeners who valued one-handed operation during walks or workouts, reinforcing the lineup's focus on functional refinements as digital formats began to loom larger on the horizon.