D-NE9

The D-NE9 made the ATRAC3plus, ATRAC3, and MP3 playback idea more accessible without stripping away the core usefulness of large file-based disc libraries. It retained G-Protection for stable playback and kept the interface recognizable for anyone already used to Sony's portable CD hardware.

This is where compressed-audio-on-CD stopped feeling like a premium feature and started feeling like a practical baseline. The D-NE9 helped extend the format by making more music per disc feel ordinary instead of specialized.