There are no many players, at least below $400, that can reproduse DVD-Audio format. Also, since I bought a DVD-Audio of R.E.M, it is 6Gb. How this can fit onto a 4.7Gb? You cannot compress the audio, or even if you can there will be quality loss. In that case you need a DL disc. A DVD-Audio disc has tha same folders as a DVD-Video, AUDIO_TS and VIDEO_TS, but the files are in the first.
Personaly I don't know any way to burn .cda format on a DVD but in a playable format to standalone players. Only if you burn them as data compilation an your player support it. Alternatively you can convert them to high bit rate WMA or MP3, which are supported from latest players.