This is not to be confused with DVD-Audio, however. It is possible to burn such discs with OS X now, and user Kay Marczoch (hi Kay!) has done so succussfully using some obscure software. It's been a while since I read his post about this, so I can't remember all the details. However, there's not much point in creating a DVD-Audio disc if you don't have multi-channel source files to begin with...
EDIT: Funny that Kay should post within a minute of me mentioning his name 🙂