Originally Posted by Redeemed
Incorrect, if I interpretted his post correctly. You would get db ProLogic surround. You could get this with analog cables as well, but the signal is far cleaner if he went digital.
Well prologic isn't going to get you discrete surround. Prologic converts any stereo source into surround by using "natural cues" (as how dolby describes it) to make some sounds come from the rear channels.
This is OK for DVD's and music, especially if they are specifically mastered for prologic usage, but you aren't going to get anywhere near the same effect in games that you'd get from discrete audio channels.