best surround sound modes?

[pinecone]

I have a Yamaha RX750 and a 5.1 speaker system (Mirage 260, etc). I know very little about surround sound modes, and this receiver causes me a great deal of confustion. Essentially, I need to know how to get the best sound out of it for DVD movies and digital cable...I set it on auto, but no matter which disk I put in to the Sony machine, the receiver uses Pro Logic: Surround Enhanced. I can manually switch it, but I'm not sure which modes would be better (and not all the modes come up). I thought Pro Logic was a program for two channel sources that artifically create a surround effect, not something specific for digital sources. Even when I play a DVD I know is encoded in Dolby Digital or DTS, it still indicates it is using Pro Logic. Can anyone give me clear information about setting up the receiver and the meaning/quality of the different surround sound modes (I didn't find the manual to be helpful at all)?

[pinecone]

I meant RX-V750 if that matters

[SRR]

Make sure your DVD player is set up correctly. You need to enable bitstream out in the players set up menu. You also need to make sure you have a digital connection between the player and receiver, either coax (RCA cable) or optical (Toslink cable).

[parallel]

I too have the RX-V750. I notice that I have to turn of the volume much higher than I would expect for my small room. :confused: I always have to turn the volume up past the halfway point. My usual comfortable listening range on this receiver is around between 60 to 80% (or if you prefer between -40 to -20 in the receiver display). I'm only driving five small speakers (the sub is self-powered). I didn't notice having to turn the volume up this much with the same speakers on an older receiver. The sound is nice, so this isn't a major problem, but I am curious. Since I bought it off of ebay, I wonder if this is a repackaged unit returned for this very reason.