5.1 surround sound audio iso

[BarnOwl]

I have a 3 gig iso file of a 5.1 upmix of what was a 2xCD music set (originals lost).  I can burn to a DVD-RW, which plays the resultant (3) AOB files on my PC, but obvously not with the surround sound; however, my Sony audio system will only play music CDs and SACDs.  Is there any way of getting this onto CDs?  I've seen other forum posts suggesting using a DVD, but my audio system will not play them DVD Audio.