Is there a need to hook up the 5.1 composite outputs for DVD-A our will the same sound come through using either my digital or optical input? I'm kind of confused on this DVDA thing.
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You cannot get DVD-A via digital, with the exception of a very few high end components at this time. For movies, you can use the digital connection, but for DVD-A, you will have to use stereo or multi-channel analog outs from the player.
Multi-channel audio out is only possible via the analog cables (all five of them) due to security concerns that if the signal were provided digitally, it would be easier to steal. Therefore all the decoding is done inside the player itself, and should be passed through the analog cables to your receiver.