In 1987, the subdivision of models based on their intended use progressed even further. At the same time, improvements to sound quality and usability were applied throughout the entire design.
WM-51
The WM-51 is a playback-only Walkman with an automatic inversion function. It features Dolby B and uses AA batteries. It is an early high-performance model that combines automatic inversion and noise reduction functions.
WM-F51
The WM-F51 is a Walkman with a built-in radio. It features Dolby B and auto-reverse, and uses AA batteries. It belongs to the early Walkman lineage that integrated radio functionality.
WM-103
The WM-103 is a playback-only Walkman with an automatic inversion function. It features Dolby B and is compatible with AA batteries and gum-type rechargeable batteries. It is an early high-performance model that combines automatic inversion and noise reduction functions.
WM-F109
The WM-F109 is a Walkman with a built-in radio. It features Dolby B, remote control operation, and automatic reversal, and is compatible with AA batteries and gum-type rechargeable batteries. It belongs to the early Walkman lineage that integrated radio functionality.
WM-F203
The WM-F203 is a Walkman with a built-in radio. It features Dolby B and auto-reverse, and supports recording and both AA batteries and gum-type rechargeable batteries. It belongs to the early Walkman lineage that integrated radio functionality.
WM-501
The WM-501 is a playback-only Walkman with an automatic inversion function. It features Dolby B and is compatible with AA batteries and gum-type rechargeable batteries. It is an early high-performance model that combines automatic inversion and noise reduction functions.
WM-F502
The WM-F502 is a Walkman with a built-in radio. It features Dolby B and auto-reverse, and is compatible with AA batteries and gum-type rechargeable batteries. It belongs to the early Walkman lineage that integrated radio functionality.
WM-503
The WM-503 is a playback-only Walkman with an automatic inversion function. It features Dolby B and is compatible with AA batteries and gum-type rechargeable batteries. It is an early high-performance model that combines automatic inversion and noise reduction functions.
WM-504
The WM-504 is a playback-only Walkman with an automatic inversion function. It features Dolby B and is compatible with AA batteries and gum-type rechargeable batteries. It is an early high-performance model that combines automatic inversion and noise reduction functions.
In 1987, the diversity and performance of the product range were expanded simultaneously. This structure was continued to be applied in subsequent models to improve performance.
