1998 D-E400
The D-E400 is a portable CD player equipped with an electronic anti-skip mechanism using ESP2.
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The D-E505 sat a step above the most basic models while keeping the same compact footprint and adding a slightly more responsive interface along with a more considered overall feel around ESP buffering and Mega Bass. It is still very much an everyday player, but one that had been tuned a little more carefully around touch and interaction.
That difference is subtle, but it matters. The D-E505 is part of the part of the range where buyers could move upward into something a little more refined without crossing into overtly premium territory. A lot of late-period Sony hardware is differentiated exactly this way.