I had problems with a couple of DualDiscs in a Denon 3910, so I sold the discs and never bought another.
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Dual Discs are slightly thicker than other discs. As a result, some players are unable to read them; the laser just doesn't line up correctly because of the extra couple millimeters.
If I were you, I'd contact the manufacturer and see if they've had success or failure playing Dual Discs in their machine.
I have never had a problem playing dual discs in my 5910CI. Make sure you set the player for audio in the Denon setup menu. Otherwise it will only playback the DTS layer of the disc. A word of caution though some DVDA discs will not show video through the HDMI output when set to the audio mode. If this occurs with the Denon player you may need to hook up and alternate video output for DVDA playing.