Manual located at:
http://www.oppodigital.com/Download/OPDV971H_User_Manual.pdf
Look at Page 4 rear panel connectors:
area 2. Mixed L/R Audio Out Jacks
area 3. 5.1ch Audio Out Jacks
If you connect directly to TV using DVI. The DVI does not contain audio so you must also connect audio from area 2; see page 7 This level of DVI is not compatible with HDMI 1.3 and therefore audio is not carried and must be connected separately.
Optionally you can connect 5.1 ch output ( area 3 ) to your AVR see page 12.
It doesn't apprear the manual to tells you to connect both analog and digital; it appears to be an "either analog(area 2) or digital (area3)" connection depending on what you are connecting to and the the capabilities of the TV and AVR.