1989 D-22
The D-22 is a compact portable CD player built on the same platform.
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The D-250 landed as a more refined upper-tier portable at the end of the decade, with the kind of fit, finish, and accessory support that marked Sony's more serious Discman models. It built on the same mechanical progress seen elsewhere in the range, but packaged it in a way that felt more complete and deliberate than the average mid-line player.
By this stage, the category had matured enough to support real gradations in quality. The D-250 was not trying to reinvent portable CD. It was trying to feel like a better version of something people had already decided they wanted, which was a very different kind of confidence.