The manual for my Onkyo 696 AVR recommends that one connects the DVD's digital audio output (toslink or coaxial) to the AVR and TOGETHER with this also connect the RCA analog audio out of the DVD to the AVR. Why the redundant audio connections? Wouldn't a digital connection alone be enough to handle all audio data from the DVD player? I would appreciate any clarification of this. My basic concern is if I connect both the AVR may not work properly. Thanks.