Sony DRX-800UL Operating Instructions Manual page 20

Note on DualDiscs
This product is designed to playback discs that conform to the Compact Disc
(CD) standard. A DualDisc is a two sided disc product which mates DVD
recorded material on one side with digital audio material on the other side.
Please be aware that the audio side of a DualDisc may not play on this product
because these discs do not conform to the CD standard.
"DualDisc" is a trademark of the Recording Industry Association of America
(RIAA).
20