This shows what codecs are supported by the Kenwood DNX9980HD car DVD/Nav system. This test was performed with .wav, .mp3, .m4a (both iTunes and Nero AAC), and .wma formats from both USB and CD-R. In summary, via USB, all formats except for MP3 have the volume gradually faded in when playback starts, which is an annoying tendency that cannot be disabled. On CD and DVD this problem does not occur, however, AAC files encoded with recent versions of NeroAACenc do not play back from optical discs without modification, (although iTunes files work fine). WMA files also don’t play back on CD or DVD.
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DNX9980HD Format Support Demonstration