WM-EX911

Sony evolved the EX511 and EX618 platform into the WM-EX911, giving it a more streamlined build with a widened viewing window and an exterior that matched the mid-nineties direction of the EX line. Most of the transport and audio circuitry followed the established architecture, using Sound Fluctuation Guard to steady tape speed and logic control for smooth electronic switching. Auto Reverse handled continuous playback on both sides.

The EX911 blended familiar EX performance with a retractable layout designed to reduce cable handling. Playback features included AMS, Blank Skip, metal tape support, Dolby B, and an extended bass circuit. Power came from a gumstick cell with the option to add a single AA battery for longer sessions.

Depending on mode and tape type, the combined setup could run for close to thirty-six hours, which made the player practical for extended daily use. The retractable system defined the EX911. The headphone line stored inside the body on a paired reel mechanism driven by a constant-force spring, keeping the cable under controlled tension and pulling it back when not needed.

Small holders secured the earpieces, and the inline remote handled basic transport commands so the player could stay clipped or tucked away during listening. The design reduced cable management and made the unit easier to use in pockets or bags. The WM-EX911 integrated retractable cable control into the Walkman format, simplifying everyday use without changing the underlying playback system.