WM-EX999

The WM-EX999 was built around a rigid metal shell and a reinforced frame that placed it in the more specialized corner of Sony's cassette lineup. It was shaped for durability and long stretches of playback, and the mechanism was tuned to stay consistent without softening the sound.

It sat at the top of the playback-only range alongside the FM-capable FX999. A single gumstick cell delivered a longer runtime than earlier EX models, which made the player dependable during extended commutes or travel.

Its most distinctive element was the Dual Head Mechanism. Instead of forcing one head to handle both directions, Sony gave each direction its own fixed head with its own azimuth. Where most portable players cut corners, the EX999 used two playback heads and a chassis built to protect them. The result preserved high frequencies in both directions and avoided the tonal drift that most auto-reverse systems developed over time.