The following links may be interesting for those wanting to know what Audio format is encoded on these disks:
http://www.avsforum.com/avs-vb/showpost.php?p=9044310&postcount=1
http://www.avsforum.com/avs-vb/showthread.php?t=822245

HT:M80,VP150,QS8,EP500 Outside:4xM3 Office:AudioBytes, Rumpus: M60,VP150,M22 Portable:2 x Airs